Allied Telesis Rapier Switch User Manual

RAPIER SWITCH
USER GUIDE
Software Release 2.5.1
2 Rapier Switch User Guide
Rapier Switch User Guide Document Number C613-02025-00 Rev B.
All rights reserved. No part of this publication may be reproduced without prior written permission from Allied Telesyn.
Allied Telesyn International, Corp. reserves the right to make changes in specifications and other information contained in this document without prior written notice. The information provided herein is subject to change without notice. In no event shall Allied Telesyn be liable for any incidental, special, indirect, or consequential damages whatsoever, including but not limited to lost profits, arising out of or related to this manual or the information contained herein, even if Allied Telesyn has been advised of, known, or should have known, the possibility of such damages.
All trademarks are the property of their respective owners.
Software Release 2.5.1
C613-02025-00 Rev B

Contents

3
CHAPTER 1
CHAPTER 2
CHAPTER 3
Introduction
Why Read This User Guide? .............................................................................. 5
Where To Find More Information ...................................................................... 6
Technical support .............................................................................................. 6
What Can the Rapier Switch Do? ...................................................................... 7
Switching Features ..................................................................................... 7
Routing Features ........................................................................................ 8
Special Features Licences ............................................................................ 9
Getting Started
Simple Switching ............................................................................................ 11
Command Line Interface ................................................................................. 11
Logging In ................................................................................................ 12
Giving the Switch an IP Address ............................................................... 12
Entering Commands ................................................................................. 13
The Graphical User Interface (GUI) .................................................................. 13
Enabling and Disabling the GUI ................................................................ 13
Accessing the GUI .................................................................................... 14
Enabling Special Feature Licences .................................................................... 15
Operating the Switch
User Privileges ................................................................................................. 17
File Subsystem ................................................................................................ 17
Online CLI Help ............................................................................................... 18
Configuration Scripts ...................................................................................... 19
Saving Configuration Entered with the GUI .............................................. 20
Saving Configuration Entered with the CLI ............................................... 20
Editor ............................................................................................................. 20
Install Information ........................................................................................... 21
Releases and Patches into the Switch .............................................................. 23
Example: Install Software Upgrade for Rapier Switch ................................ 25
SNMP and MIBs .............................................................................................. 26
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CHAPTER 4
Layer 2 Switching
Switch Ports .................................................................................................... 29
Enabling and Disabling Switch Ports ......................................................... 29
Autonegotiation of Port Speed and Duplex Mode ..................................... 32
Port Trunking ........................................................................................... 33
Packet Storm Protection ........................................................................... 34
Port Mirroring .......................................................................................... 36
Port security ............................................................................................. 37
Virtual Local Area Networks (VLANs) ............................................................... 38
VLAN Tagging .......................................................................................... 39
4 Rapier Switch Software Reference
VLAN Membership of Untagged Packets .................................................. 42
Creating VLANs ........................................................................................ 43
Summary of VLAN tagging rules ............................................................... 44
Protected VLANs ...................................................................................... 45
VLAN Interaction with STPs and Trunk Groups .......................................... 45
Generic VLAN Registration Protocol (GVRP) ..................................................... 45
Layer 2 Switching Process ............................................................................... 46
The Ingress Rules ...................................................................................... 46
The Learning Process ................................................................................ 47
The Forwarding Process ............................................................................ 48
Layer 2 Filtering ........................................................................................ 49
The Egress Rules ....................................................................................... 50
Quality of Service ............................................................................................ 50
Spanning Tree Protocol (STP) ........................................................................... 52
Spanning Tree Modes ............................................................................... 53
Spanning Tree and Rapid Spanning Tree Port States .................................. 53
Overlapping VLANs belonging to multiple Spanning Tree instances ........... 54
Configuring STP ....................................................................................... 55
Interfaces to Layer 3 Protocols ......................................................................... 64
IGMP Snooping .............................................................................................. 64
Triggers ........................................................................................................... 67
CHAPTER 5
Layer 3 Switching
Internet Protocol (IP) ....................................................................................... 69
IP Multicasting ................................................................................................ 70
Routing Information Protocol (RIP) .................................................................. 70
Novell IPX ....................................................................................................... 71
AppleTalk ........................................................................................................ 72
Resource Reservation Protocol (RSVP) .............................................................. 72
Documentation Roadmap
Network Service Modules
NSM Quick Install Guide
NSM Hardware Reference
Port Interface Cards
PIC Quick Install Guide
PIC Hardware Reference
Rapier Switch
Safety and Statutory Information
Switch Quick Install Guide
Switch Hardware Reference
Switch Software Reference
Rapier Switch User Guide
Uplink Module
Uplink Module Quick Install Guide
Uplink Module Hardware Reference
General Customer Support
Visit www.alliedtelesyn.co.nz for the latest documentation, FAQ, and support information
Printed Acrobat PDF
Website
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Introduction 5
Chapter 1

Introduction

Welcome to the Rapier Series Layer 3 Gigabit switch, combining wire speed Layer 2 and Layer 3 IP switching, with a powerful multiprotocol routing software suite.

Why Read This User Guide?

This User Guide describes how to get started accessing the switch’s Command Line Interface (CLI) and its Graphical User Interface (GUI), and how to configure the Layer 2 switching features. For more detailed descriptions of all commands and display outputs see the Rapier Switch Software Reference. The user guide is organised into the following chapters:
Chapter 1, Introduction introduces the Rapier switch and gives an overview
of the features of the Rapier switch and its documentation.
Chapter 2, Getting Started describes how to gain access to the switch’s
command line and graphical user interfaces.
Chapter 3, Operating the Switch introduces general operation, management
and support features, including user authentication, loading and installing
support files, and SNMP MIBs.
Chapter 4, Layer 2 Switching describes how to configure Layer 2 switching
features, including switch ports, VLANs and STP.
Chapter 5, Layer 3 Switching describes how to use Layer 3 switching over
VLANs, including IP, Novell IPX and AppleTalk. Full descriptions of the
switch’s support for these protocols are found in the Rapier Switch Software
Reference.
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6 Rapier Switch Software Reference

Where To Find More Information

Before installing the switch and any expansion options, read the important safety information in the Safety and Statutory Information booklet. Follow the Quick Install Guides step-by-step instructions for physically installing the switch and its expansion options. The Hardware References give detailed information about the equipment hardware. Once you are familiar with the basic operations of the switch, use the Software Reference for full command syntax descriptions and for full descriptions of the switch’s routing features.
The latest versions of user documentation for the Rapier family of switches can be downloaded from the on-line support site at
http://www.alliedtelesyn.co.nz/support/rapier
Rapier switch includes:
Rapier Switch Safety and Statutory Information
Rapier Switch Quick Install Guide
Rapier Switch Documentation and Tools CD-ROM, which includes the
following PDF documents:
Rapier Switch Safety and Statutory Information
. The documentation set for the
Rapier Switch Quick Install Guide,
Rapier Switch Hardware Reference
Rapier Switch Software Reference
Rapier Uplink Module Quick Install Guide
Rapier Uplink Module Hardware Reference
Network Service Module Quick Install Guide
Network Service Module Hardware Reference
Port Interface Card Quick Install Guide
Port Interface Card Hardware Reference

Technical support

For on-line support for your Rapier switch, see our on-line support page at
http://www.alliedtelesyn.co.nz/support/rapier
contact your authorised Allied Telesyn distributor or reseller.
This page will also contain the latest release of the switch software. The LOAD command can be used to download software upgrades directly from the Allied Telesyn Research web site to the switch’s FLASH memory. Use the SET INSTALL command to enable the new software release (“Example: Install Soft- ware Upgrade for Rapier Switch” on page 25).
. If you require further assistance,
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Introduction 7

What Can the Rapier Switch Do?

The Rapier switch software support for the Rapier Series switches and their expansion options provides wirespeed Layer 2 switching, including support for Virtual LANs, wirespeed Layer 3 IP switching, and Layer 3 multiprotocol routing.

Switching Features

The main Layer 2 features of the switch are:
High performance, non-blocking, wire-speed Layer 2 switching (“Layer 2
Switching Process” on page 46).
Packet Forwarding at wire speed (“The Forwarding Process” on page 48).
Store and Forward switching mode.
Autonegotiation of link speed and duplex mode for 10/100 Mbps speed on
all 100BASE TX ports (“Autonegotiation of Port Speed and Duplex Mode” on
page 32).
Autonegotiation of duplex mode for 10/100 and gigabit Ethernet ports
(“Autonegotiation of Port Speed and Duplex Mode” on page 32).
Automatic, configurable MAC address learning and ageing, supporting up
to 8191 MAC addresses per switch (“The Learning Process” on page 47).
Switch Filtering (“Layer 2 Filtering” on page 49).
Layer 3 Filtering (Switching chapter in Rapier Switch Software Reference).
Broadcast Storm Protection (“Packet Storm Protection” on page 34).
Virtual LANs defined by port membership (“Virtual Local Area Networks
(VLANs)” on page 38).
Spanning Tree Protocol (“Spanning Tree Protocol (STP)” on page 52).
Priority tagging to support four QOS egress queues (“Quality of Service” on
page 50).
Port trunking to spread traffic over several links (“Port Trunking” on
page 33).
Port mirroring (“Port Mirroring” on page 36).
IGMP (Internet Group Management Protocol) snooping (“IGMP Snooping
on page 64).
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8 Rapier Switch Software Reference

Routing Features

In addition to Layer 2 and Layer 3 switching, the Rapier switch provides a wide array of multiprotocol routing, security and network management features.
IP routing is performed at wire-speed. Other Layer 3 routing is performed by the CPU, and increasing the routing load on the CPU decreases its performance.
Some features require the addition of WAN interfaces via Network Service Modules (NSMs) and Port Interface Cards (PICs) installed in the NSM bay on the rear of the switch.
Features provided by the routing software suite include:
IP version 4 routing
IP version 4 multicasting
IP version 6 routing
Network Address Translation (NAT) (not between switch ports)
Dynamic IP Address Assignment
IP Dynamic Filtering Firewall
IP Multihoming
IP RIP and IP RIPv2
DNS Relay
Demand IP
IP Filtering (not between switch ports)
IP Packet Prioritisation (not between switch ports)
Generic Routing Encapsulation (GRE)
Basic Rate and Primary Rate access to Integrated Services Digital Network
(ISDN) services, with dial-on-demand and channel aggregation.
Time Division Multiplexing (TDM) over G.703 links
Frame Relay
X.25
ARP, Proxy ARP and Inverse ARP address resolution protocols.
BACP (Bandwidth Allocation Control Protocol)
PPP Multilink
PPP over Ethernet (PPPoE)
Bandwidth on Demand
CLI, PAP and CHAP
Virtual Router Redundancy Protocol (VRRP) for fault tolerant internet
gateways (on NSM ports only)
IPsec
ISAKMP Key Management
Data Compression
Predictor Data Compression
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Introduction 9
STAC Data Compression
L2TP
Telnet client and server.
A sophisticated and configurable event logging facility for monitoring and
alarm notification to single or multiple management centres.
Triggers for automatic and timed execution of commands in response to
events.
Scripting for automated configuration and centralised management of
configurations.
Dynamic Host Configuration Protocol (DHCP) for automatically assigning
IP addresses and other configuration information to PCs and other hosts
on TCP/IP networks.
Group management support for IP multicasting: IGMP version 2.
Support for the Simple Network Management Protocol (SNMP), standard
MIBs and the Allied Telesyn Enterprise MIB, enabling the switch to be
managed by a separate SNMP management station.
An HTTP client that allows files to be downloaded directly from a web
server to the switch’s FLASH memory, and an HTTP server that serves web
pages from FLASH.
For a complete description of the switch’s routing software, see the Rapier Switch Software Reference.

Special Features Licences

You need a special feature licence and password to activate some special features over and above the standard software release. Typically, these special features are covered by government security regulations. Special feature licences and passwords are quite separate and distinct from the standard software release licences and passwords. Some of the software features that require a special features licence are:
Triple DES S/W
Firewall SW
Firewall SMTP Application Gateway
Firewall HTTP Application Gateway
DES encryption
IPv6
BGP-4
IP Multicast routing: DVMRP and PIM-Sparse Mode
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IPX routing
Demand IPX
IPX/SPX Spoofing
IPX Filtering (not between switch ports)
AppleTalk
Resource Reservation Protocol (RSVP)
Load balancer
10 Rapier Switch Software Reference
Most software features that require a special feature licence are bundled into one of three special feature licence packs:
Full Layer 3 Feature Licence
Advanced Layer 3 Feature Licence
Security Pack Feature Licence
For more information contact your Allied Telesyn authorised distributor or reseller.
For information on how to enable special feature licences see “Enabling Special Feature Licences” on page 15.
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Getting Started 11
Chapter 2

Getting Started

The Rapier switch is supplied with default settings which allow it to operate immediately as a switch, without any configuration. Even if this is all you want to use the switch for, you should still gain access to the switch configuration, if only to change the manager password to prevent unauthorised access.
To take advantage of the full range of advanced Layer 2 switching features, the switch configuration must be changed. Layer 3 routing capabilities may also require detailed configuration. The switch has both a Command Line Interface (CLI) and a Graphical User Interface (GUI) for configuration and management. Before you can use the GUI, you will need to login to the switch and use its CLI to allocate an IP address.

Simple Switching

If all you want the switch to do is switch traffic on your LAN, you need not perform any configuration. Simply power up the switch and connect devices to the switch ports. Switch learning is enabled by default, and all valid packets will be forwarded (“Layer 2 Switching Process” on page 46).

Command Line Interface

To use the command line interface (CLI) for configuring the switch, the first thing you need to do after physically installing the switch is to start a terminal session to access the switch (see Table 1 and the Rapier Switch Quick Install Guide).
To start a terminal session, do one of the following:
Connect a VT100-compatible terminal to the RS-232 Terminal Port, set the
communications parameters on the terminal (Table 1 on page 12), and
press [Enter] a few times until the switch’s login prompt appears; or
Connect to the COM port of a PC running terminal emulation software
such as Windows Terminal or HyperTerminal to the RS-232 Terminal Port,
set the communications parameters on the terminal emulation software
(Table 1 on page 12), and press [Enter] a few times until the switch’s login
prompt appears.
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12 Rapier Switch Software Reference
Table 1: Parameters for terminal communication .
Parameter Value
Baud rate 9600
Data bits 8
Parity None
Stop bits 1
Flow control Hardware

Logging In

A user accessing the switch from a terminal or PC connected to the front panel RS-232 terminal port (asyn0), or via a Telnet connection, must enter a login name and password to gain access to the command prompt. When the switch is supplied, it has a manager account with an initial password friend. Enter your login name at the login prompt:
Enter your login name at the login prompt:
login: manager
Enter the password at the password prompt:
password: friend
This password should be changed to prevent unauthorised access to the switch, using the command:
SET PASSWORD
Make sure you remember the new password you create, as a lost password cannot be retrieved, and would mean losing access for configuring and monitoring the switch.

Giving the Switch an IP Address

Once you have logged into the manager account you will be able to enter commands from this document and from the Rapier Switch Software Reference.
Enable IP, then add an IP interface over the default VLAN (vlan1) and assign it an IP address (e.g. 192.168.1.1), using the commands:
ENABLE IP
ADD IP INTERFACE=vlan1 IPADDRESS=192.168.1.1
Once the switch is configured with an IP address, the command line interface can also be accessed by using Telnet to the switch from an IP host.
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Getting Started 13

Entering Commands

The switch is controlled with commands described in this document and in the Rapier Switch Software Reference. While the keywords in commands are not case sensitive, the values entered for some parameters are. The switch supports command line editing and recall (Table 2 on page 13).
Table 2: Command line editing functions and keystrokes
Function VT100-compatible Keystroke
Move cursor within command line ←, →
Delete character to left of cursor [Delete] or [Backspace]
Toggle between insert/overstrike [Ctrl/O]
Clear command line [Ctrl/U]
Recall previous command or [Ctrl/B]
Recall next command or [Ctrl/F]
Display command history [Ctrl/C] or
SHOW ASYN HISTORY
Clear command history RESET ASYN HISTORY
Recall matching command [Tab] or [Ctrl/I]

The Graphical User Interface (GUI)

The switch may be configured and managed with an HTTP-based Graphical User Interface (GUI). The GUI may be accessed with Internet Explorer version 5 or greater. A copy of Internet Explorer can be found on the switch’s Documentation and Tools CD-ROM. JavaScript must be enabled.
Use the menus and buttons on the GUI pages to navigate, not your browser’s buttons, to ensure that the configuration settings are saved correctly.

Enabling and Disabling the GUI

The GUI is enabled by default. To enable or disable the GUI, use the following commands:
ENABLE GUI
DISABLE GUI
When enabled, the GUI will only work if a valid resource file for the hardware model is present in FLASH memory, and if the HTTP server is enabled (see the Operations chapter of the Rapier Switch Software Reference).
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14 Rapier Switch Software Reference

Accessing the GUI

To allow the GUI to be browsed to, the switch’s VLAN1 interface must be given an IP address. In some situations, routing information must also be configured. For more information about IP configuration, see the Internet Protocol (IP) chapter of the Rapier Switch Software Reference).
You can optionally browse to the GUI with a Secure Sockets Layer (SSL) connection. This means that sensitive data including passwords and email addresses can not be accessed by malicious parties. For details on configuring a SSL connection for the GUI, refer to the Secure Sockets Layer (SSL) chapter of the Rapier Switch Software Reference).
To access the GUI:
1. Access the switch’s command line interface.
See the switch’s Quick Install Guide for more information.
2. Enable IP, using the command:
ENABLE IP
3. Assign the VLAN1 interface an IP address in the required subnet, using the command:
SET IP INTERFACE=vlan1 IP=ipaddress MASK=mask
4. If the PC from which you will access the GUI is on a different subnet to the switch, add a route from the PC to the switch, using the command:
ADD IP ROUTE=PC-ipaddress INTERFACE=vlan1
NEXTHOP=switch-ipaddress
5. If you access the Internet through a proxy server, set your browser to bypass the proxy for the VLAN1 interface’s IP address.
6. Point your web browser at VLAN1’s IP address.
7. At the login prompt, enter the user name and password.
User Name: manager
Password: friend
The home page is displayed. Select options to configure and manage the
switch.
To change the password, select Management > Users from the sidebar menu. Select the Manager account and click Modify.
Getting help
To access the GUI’s context-sensitive help system, click on the Help button in the sidebar menu.
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Getting Started 15

Enabling Special Feature Licences

You must enable the special feature licence you have purchased before you can use the licenced features. You will need the password provided by your authorised distributor or reseller. The advanced upgrade licence and password are different from the standard software release licence and password. The licence cannot be transferred from one router to another.
For software features that require a special feature licence see “Special Features
Licences” on page 9.
You must order passwords for special feature licences from your authorised distributor or reseller. You must specify the special feature licence bundle and the serial number(s) of the switch(s) on which the special feature licences are to be enabled.
The password for a special feature licence is a string of at least 16 hexadecimal characters, and encodes the special feature or features covered by the license, and the switch serial number. The password information is stored in the switch’s FLASH memory.
To enable or disable the AT-RPFL3Upgrade use the commands:
ENABLE FEATURE=AT-RPFL3Upgrade PASSWORD=password
DISABLE FEATURE=AT-RPFL3Upgrade
Other features on the switch, such as Firewall, Remote Secure Shell and Triple DES encryption, and support for Public Key Infrastructure may also need special feature licences. To list the current special feature licences use the command:
SHOW FEATURE[={featurename|index}]
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Operating the Switch 17
Chapter 3

Operating the Switch

This chapter introduces general operation, management and support features, including user authentication, loading and installing support files, and SNMP MIBs. For more information see Chapter 1, Operation in the Rapier Switch
Software Reference.

User Privileges

The command processor supports three levels of privilege, USER, MANAGER, and SECURITY OFFICER, distinguished by the prompt displayed by the command processor when it is ready to receive commands. A USER level prompt looks like:
>
while a MANAGER prompt looks like:
Manager >
and a SECURITY OFFICER prompt looks like:
SecOff >
See Chapter 1, Operation in the Rapier Switch Software Reference for more information about creating new accounts with user, manager and security officer privileges.

File Subsystem

FLASH memory is structured like a file subsystem. Files can be saved, renamed, listed and deleted. Release files, online help files, configuration scripts and other scripts are all stored as files in FLASH memory.
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File names of up to 16 characters long, with extensions of 3 characters (DOS
16.3 format), are supported on the switch. However, files on the switch are stored in FLASH and NVS using the DOS 8.3 format of 8 characters long, with extensions of 3 characters. For example, the file be saved as accessed via two file names, either of which can be used for file management.
A translation table, named
16.3 format and DOS 8.3 format. To reconcile file names the switch consults the
extral~1.cfg
in the FLASH File System. Therefore, files can be
longname.lfn
extralongfilenam.cfg
, converts file names between DOS
may
18 Rapier Switch Software Reference
translation table which is synchronised with file contents in memory. For more information about working with files see the Working With Files section, Operation chapter, AR400 Series Router Software Reference.
To display the files in FLASH, use the command:
SHOW FILE
Table 3: Example output from the SHOW FILE command.
Filename Device Size Created Locks
---------------------------------------------------------------------------­28-72.pat flash 111764 05-May-1997 12:41:42 0 28-74ang.rel flash 2013756 09-May-1997 15:58:55 0 28f72-06.pat flash 123268 18-Apr-1997 15:58:16 0 release.lic flash 32 08-May-1997 16:43:49 0 test.cfg flash 1698 09-May-1997 10:39:42 0 config.ins nvs 32 09-May-1997 10:22:46 0 sixteenalongfile.scp flash 24 30-May-1997 15:10:12 0
----------------------------------------------------------------------------
The Locks field indicates the number of concurrent processes using the file.
The switch automatically compacts FLASH memory when a maximum threshold of deleted files is reached. Compaction frees space for new files by discarding garbage. A message will appear when FLASH compaction has been activated. Another message appears when FLASH compaction is complete.
While FLASH is compacting, do not restart the switch or use any commands that affect the FLASH file subsystem. Do not restart the switch, or create, edit, load, rename or delete any files until a message confirms that FLASH file compaction is completed. Interrupting flash compaction may result in damage to files.

Online CLI Help

Online help is available for all switch commands in the CLI. Typing a question mark “?” at the end of a partially completed command displays a list of the parameters that may follow the current command line, with the minimum abbreviations in uppercase letters. The current command line is then re­displayed, ready for further input.
An online help facility provides more detailed help information via the command:
HELP [topic]
If a topic is not specified, a list of available topics is displayed. The HELP command displays information from the system help file stored in FLASH memory. The help file used by the HELP command must be defined using the command:
SET HELP=helpfile
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Operating the Switch 19
The current help file and other system information can be displayed with the command:
SHOW SYSTEM
Table 4: Example of output from the SHOW SYSTEM command
Switch System Status Time 14:29:17 Date 12-Sep-2000. Board ID Bay Board Name Rev Serial number
-------------------------------------------------------------------------­Base 86 AT-RP24 Rapier 24 P2-1 49867449
-------------------------------------------------------------------------­Memory - DRAM : 32768 kB FLASH : 6144 kB
-------------------------------------------------------------------------­SysDescription CentreCOM AT-RP24 Rapier 24 version 2.1.0-00 04-Sep-2000 SysContact
SysLocation
SysName
SysUpTime 30262 ( 00:05:02 ) Software Version: 2.1.0-00 04-Sep-2000 Release Version : 2.1.0-00 04-Sep-2000 Release built : Sep 12 2000 at 14:28:59 Patch Installed : NONE Territory : usa Help File : help.hlp
Main PSU : On Main Fan : On RPS Monitor : On RPS Connected : Yes RPS PSU : On
Boot configuration file: vts.cfg (exists) Current configuration: vts.cfg Security Mode : Disabled
Warning (248283): No patches found.

Configuration Scripts

At boot the switch executes the commands in the boot script to configure the switch. A boot script is a sequence of standard commands that the switch executes at start-up. The default boot script is called alternative script file can be defined as the boot script using the command:
SET CONFIG=filename
A configuration file is a script made up of the same commands as are used in the CLI. It can be edited manually using the switch’s built in editor (“Editor” on page 20), or uploaded to a PC and edited using any text editor using the UPLOAD command (Chapter 1, Operation in the Rapier Switch Software Reference).
boot.cfg
, but an
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20 Rapier Switch Software Reference

Saving Configuration Entered with the GUI

Configuration changes applied using the GUI can be saved to a configuration script by clicking the Save button on any GUI page that has one. A pop-up Save window gives the option of saving to the boot configuration file, the current configuration file, another existing file or a new file.

Saving Configuration Entered with the CLI

Subsequent commands entered from the command line or executed from a script affect only the dynamic configuration in memory, which is not retained over a power cycle. Changes are not automatically stored in nonvolatile memory. When the switch is restarted the configuration will be restored to that defined by the boot script, or if the switch was restarted using the RESTART command, any script specified in the RESTART command.
To retain any configuration changes made after boot across a restart or power cycle, save the modified configuration as a script file, using the command:
CREATE CONFIG=filename
The configuration file created by the GUI or the CREATE CONFIG command records passwords in encrypted form, not in cleartext.

Editor

The switch has a built-in full-screen text editor for editing script files stored on the switch file subsystem. Scripts can be run manually, or run when a trigger automatically activates on some specified events in the switch. See “Triggers” on page 67, and the Trigger Facility chapter in the Rapier Switch Software Reference. To access the editor, use the command:
EDIT [filename]
The file name is optional as a file can be loaded, or a new file can be created from within the editor itself (Figure 1 on page 21).
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Operating the Switch 21
Figure 1: The editor screen layout.
The editor uses VT100 command sequences and should only be used with a VT100-compatible terminal, terminal emulation program or Telnet client.
To display editor Help at any time while in the editor press [Ctrl/K,H]; that is, hold down the Ctrl key and press in turn the K key then the H key.

Install Information

The INSTALL module is responsible for maintaining install information and loading the correct install at boot. A release is a binary file containing the code executed by the switches CPU. There may also be a patch file, and additional binary file that modifies the original release file. An install is a record identifying a release and an optional patch. Three installs are maintained by the INSTALL module, temporary, preferred and default.
The default install is the install of last resort. The release for the default install can not be changed by the manager and is always the EPROM release. The patch for the default install may be set by the manager.
The temporary and preferred installs are completely configurable. Both the release and an associated patch may be set. The release may be EPROM or a release stored in FLASH.
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The three different installs are required to handle the following situations:
A default install is required to handle the case when only the EPROM
release is present.
A temporary install is required to allow a release and/or patch to be
loaded once only, in case it causes a switch crash.
A preferred install is required because the default install can not be
anything other than the EPROM.
The install information is inspected in a strict order. The temporary install is inspected first. If this install information is present, the temporary install is
22 Rapier Switch Software Reference
loaded. At the same time, the temporary install information is deleted. This ensures that if the switch reboots immediately as the result of a fatal condition caused by the temporary install, the temporary install will not be loaded a second time.
If there is no temporary install defined, or the install information is invalid, the preferred install is inspected. If present, this install is loaded. The preferred install information is never deleted.
If neither temporary nor preferred installs are present, the default install is used. The default install will always be present in the switch, because if, for some reason, it is not, the INSTALL module will restore it.
The preferred install should not be set up with an untested release or patch. It is advisable to install new releases or patches as the temporary install, and when the switch boots correctly, to then set up the preferred install with the new release or patch.
To change the install information in the switch, use the command:
SET INSTALL={TEMPORARY|PREFERRED|DEFAULT}
[RELEASE={release-name|EPROM}] [PATCH[=patch-name]]
The INSTALL parameter specifies which install is to be set. The INSTALL module is responsible for maintaining install information and loading the correct install at boot. An install is a record identifying a release and an optional patch. Three installs are maintained by the INSTALL module, temporary, preferred and default.
The default install is the install of last resort. The release for the default install can not be changed by the manager and is always the EPROM release. The patch for the default install may be set by the manager.
The temporary and preferred installs are completely configurable. Both the release and an associated patch may be set. The release may be EPROM or a release stored in FFS.
The RELEASE parameter specifies the release file for this install. The release file is either a file name of the form
device:filename.ext
for files in the file subsystem, or EPROM, to indicate the EPROM release. The default value for the device field is FLASH.
The PATCH parameter specifies the patch file for this install, and is a file name of the form
device:filename.ext
default value for the device field is
. The patch file is stored in FLASH. The
. If the patch name is not given, the
FLASH
patch file information for a given install is removed and only the release file will be loaded for the install.
A patch file can not be set up for an install unless a release file is already set up, or a release file is specified in the same command. This stops the inadvertent setting of an install to be just a patch file. When the switch reboots in such a case the particular install is ignored, which may have undesirable effects on the switch operation.
For security reasons this command will only be accepted if the user has SECURITY OFFICER privilege.
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To delete a particular install (except the default install) use the command:
DELETE INSTALL
To display the current install information, including which install is currently running in the switch, and how the install information was checked at the last reboot, use the command:
SHOW INSTALL
Table 5: Example output from the SHOW INSTALL command.
Install Release Patch Dmp
------------------------------------------------------------------------­Temporary - - ­Preferred flash:86s-210.rez - ­Default EPROM (8-1.6.0) - -
-------------------------------------------------------------------------
Current install
------------------------------------------------------------------------­Preferred flash:8d-181.rez - -
-------------------------------------------------------------------------
Install history
------------------------------------------------------------------------­No Temporary install selected Preferred install selected Preferred release successfully installed Preferred patch successfully installed
-------------------------------------------------------------------------

Releases and Patches into the Switch

The LOADER module is responsible for loading and storing releases, patches and other files into FLASH. The LOADER module uses the Trivial File Transfer Protocol (TFTP), Hypertext Transfer Protocol (HTTP) or ZMODEM over an asynchronous port, to retrieve files from a network host. The FFS module is used to create, write and destroy release and patch files.
The loader can be configured with the command:
SET LOADER [DELAY=delay|DEFAULT]
[DESTINATION={FLASH|DEFAULT}] [FILE=filename] [HTTPPROXY={hostname|ipadd|DEFAULT}] [METHOD={HTTP|TFTP|WEB|WWW|ZMODEM|NONE|DEFAULT}] [ASYN=port|DEFAULT] [PROXYPORT=1..65535|DEFAULT] [SERVER={hostname|ipadd|DEFAULT}]
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This command sets default values for the name of the file to load, the network host to load it from, and the memory location in which to store the file. These default values can be overridden when the load actually takes place. A time delay between initiating a load and the start of the load can also be configured.
The DELAY parameter specifies the delay, in seconds, between initiating the file download and the download actually starting. This feature is provided to allow reconfiguration of ports and devices after initiating the download. For example, a manager may be at a remote site with a single PC which is to act as both the access device to the switch and the TFTP server. By specifying a delay, the manager has time to reconfigure the PC from terminal emulation mode to
24 Rapier Switch Software Reference
TFTP server mode before the download starts. The DELAY parameter is optional. If DEFAULT is specified, this parameter is set to the factory default, which is no delay.
The DESTINATION parameter specifies where the file will be stored. If FLASH is specified, the file is stored in the FLASH File System (FFS) on the switch. If DEFAULT is specified, this parameter is set to the factory default, FLASH.
The FILE parameter specifies the name of the file, in the syntax of the server from which the file will be downloaded. The FILE parameter is a full path name rather than just a file name. The only restriction is that the last part of the parameter must be a valid file name for the LOADER module. When METHOD is set to TFTP, HTTP, ZMODEM or NONE, valid file names are of the form and
ext
filename.ext
is three characters in length. The following are examples of valid file
where
filename
is one to sixteen characters in length
names for methods TFTP, ZMODEM or NONE:
\user\public\filename.ext ; UNIX or DOS server [network.cfg]filename.ext ; DEC VAX server
Note that, starting at the end of the file name and working backwards, the first character not valid in file names delimits a valid file name for the switch. If the slash at the beginning of the path is omitted in this command, the LOAD command adds it. The following are examples of valid file names for method HTTP:
/path/filename.ext
path/filename.ext
The HTTPPROXY parameter specifies the proxy server used to handle HTTP requests. Either the IP address or the fully qualified domain name of the proxy server may be specified. If a domain name is specified, the switch will perform a DNS lookup to resolve the name. If DEFAULT is specified, this parameter is set to the factory default, which has no value set for HTTPPROXY, clearing any value previously set as default.
The METHOD parameter specifies the method to use when downloading the file. If HTTP is specified, HTTP is used to download the file. The options WEB and WWW are synonyms for HTTP. If TFTP is specified, TFTP is used to download the file. If ZMODEM is specified, the ZMODEM protocol is used to download the file. If ZMODEM is specified, the PORT parameter must be specified, unless it has been set with the SET LOADER command. If NONE is specified, only text files can be downloaded and all input received via the port will be directed to the specified file on the switch’s file subsystem. The file transfer is terminated by the first control character received that is not a CR or LF character. The FILE parameter is not valid when METHOD is set to ZMODEM. The PORT parameter is not valid when METHOD is set to HTTP, WEB, WWW, TFTP or NONE. If DEFAULT is specified, this parameter is set to the factory default, which is TFTP.
The ASYN parameter specifies the asynchronous port via which the file will be downloaded, when the METHOD parameter is set to ZMODEM or NONE. If METHOD is set to ZMODEM or NONE, the PORT parameter is required unless it has been set with the SET LOADER command. If DEFAULT is specified, this parameter is set to the factory default, which is no PORT set, clearing any value previously set as default.
The PROXYPORT parameter specifies the port on a proxy server. The PROXYPORT parameter is only valid if METHOD is HTTP and HTTPPROXY is specified. If DEFAULT is specified, this parameter is set to the factory default, which is 80.
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The SERVER parameter specifies the IP address or the host name (a fully qualified domain name) of the TFTP server or HTTP server from which the file is loaded. If a host name is specified, a DNS lookup is used to translate this to an IP address. The SET IP NAMESERVER command can be used to define name servers. The PING command can be used to verify that the switch can communicate with the server via IP. The SERVER parameter is not used when METHOD is set to ZMODEM or NONE. The following are examples of valid server names when METHOD is set to HTTP:
host.company.com
192.168.3.4
If DEFAULT is specified, this parameter is set to the factory default, which has no value set for SERVER, clearing any value previously set as default.

Example: Install Software Upgrade for Rapier Switch

This example downloads a compressed release from the Rapier Support site to the switch’s FLASH memory using HTTP.
To install a compressed release:
1. Download the release files to the switch.
The release file is downloaded to the switch with the command:
LOAD METHOD=HTTP DESTINATION=FLASH
FILE=/support/rapier/downloads/86s-210.rez SERVER=www.alliedtelesyn.co.nz HTTPPROXY=proxy-address PROXYPORT=proxy-port
where proxy-address is the fully qualified domain name (e.g. proxy.mycompany.com) or IP address (e.g. 192.168.1.1) of the proxy server, and proxy-port is the port number of the proxy port on the proxy server. If access from the switch to the world wide web is not via a proxy server, the HTTPPROXY and PROXYPORT parameters should be omitted.
The process of downloading a release file can take some time, even if the switch and the HTTP server are connected by high speed links. An indicative time for downloading a release over Ethernet is 5 to 10 minutes. The progress of the download can be monitored with the command:
SHOW LOAD
When the download has completed, the presence of the files in FLASH can be displayed with the command:
SHOW FILE
This shows the file 86s-210.rez is present.
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2. Test the release.
The release can now be tested, using the command:
SET INSTALL=TEMPORARY RELEASE=86s-210.REZ
The install information can be checked with the command:
SHOW INSTALL
The switch is then rebooted, and the install is checked again. This display should indicate, in the install history, that the temporary install was loaded.
26 Rapier Switch Software Reference
3. Make the release the default (permanent) release.
If the switch operates correctly with the new release, the release may be made permanent with the command:
SET INSTALL=PREFERRED RELEASE=86s-210.REZ
Every time the switch reboots from now on, the new release will be loaded from FLASH.
Other load methods are described in the Operations chapter in the Rapier Switch Software Reference.

SNMP and MIBs

The switch’s implementation of SNMP is based on RFC 1157 “A Simple Network Management Protocol (SNMP)”, and RFC 1812, “Requirements for IP Version 4 Routers”. The SNMP agent is disabled by default. To enable SNMP, use the
command:
ENABLE SNMP
SNMP communities are the main configuration item in the switch’s SNMP agent, and are defined in terms of a list of IP addresses which define the SNMP application entities (trap hosts and management stations) in the community. An SNMP community is created using the command:
CREATE SNMP COMMUNITY=name [ACCESS={READ|WRITE}]
[TRAPHOST=ipadd] [MANAGER=ipadd] [OPEN={ON|OFF|YES|NO|TRUE|FALSE}]
Authentication failure traps and link state traps can be enabled using the commands:
ENABLE SNMP AUTHENTICATE_TRAP
ENABLE INTERFACE=interface LINKTRAP
where interface is the name of an interface, such as vlan11.
The command:
SHOW SNMP
displays the current state and configuration of the SNMP agent (Figure 2 on page 27).
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Operating the Switch 27
Figure 2: Example output from the SHOW SNMP command.
SNMP configuration:
Status .......................... Enabled
Authentication failure traps .... Enabled
Community ....................... public
Access ........................ read-only
Status ........................ Enabled
Traps ......................... Enabled
Open access ................... Yes
Community ....................... Administration
Access ........................ read-write
Status ........................ Disabled
Traps ......................... Disabled
Open access ................... No
SNMP counters:
inPkts .......................... 0 outPkts ......................... 0
inBadVersions ................... 0 outTooBigs ...................... 0
inBadCommunityNames ............. 0 outNoSuchNames .................. 0
inBadCommunityUses .............. 0 outBadValues .................... 0
inASNParseErrs .................. 0 outGenErrs ...................... 0
inTooBigs ....................... 0 outGetRequests .................. 0
inNoSuchNames ................... 0 outGetNexts ..................... 0
inBadValues ..................... 0 outSetRequests .................. 0
inReadOnlys ..................... 0 outGetResponses ................. 0
inGenErrs ....................... 0 outTraps ........................ 0
inTotalReqVars .................. 0
inTotalSetVars .................. 0
inGetRequests ................... 0
inGetNexts ...................... 0
inSetRequests ................... 0
inGetResponses .................. 0
inTraps ......................... 0
The following MIBs are supported:
MIB II (RFC 1213)
Ethernet MIB (RFC 1643)
Trap MIB (RFC 1215)
RMON Groups 1, 2, 3, and 9 (RFC 1757)
AR Router portion of the ATI/ATKK Enterprise MIB
Portions of the Extended Interface MIB (RFC 1573)
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Layer 2 Switching 29
Chapter 4

Layer 2 Switching

This section describes the Layer 2 switching features on the Rapier switch, and how to configure them.

Switch Ports

Each Ethernet switch port is uniquely identified by a port number. The switch supports a number of features at the physical level that allow it to be connected in a variety of physical networks. This physical layer (layer 1) versatility includes:
Enabling and disabling of Ethernet ports.
Auto negotiation of port speed and duplex mode for all 10/100 Ethernet ports.
Manual setting of port speed and duplex mode for all 10/100 Ethernet ports.
Link up and link down triggers.
Port trunking.
Packet storm protection.
Port mirroring.
Support for SNMP management

Enabling and Disabling Switch Ports

An switch port that is enabled is available for packet reception and transmission. Its administrative status in the Interfaces MIB is UP. Conversely, an Ethernet port that is disabled is not available for packet reception and transmission. It will not send or receive any frames; incoming STP BPDU packets are discarded. Its administrative status in the Interfaces MIB is DOWN. Every Ethernet port on the switch is enabled by default. Disabling a switch port does not affect the STP operation on the port. Enabling a switch port will allow the port to participate in spanning tree negotiation. A switch port that has been disabled by the Port Security feature cannot be enabled using the ENABLE SWITCH PORT command.
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To enable or disable a switch port, use the commands:
ENABLE SWITCH PORT={port-list|ALL}
DISABLE SWITCH PORT={port-list|ALL}
30 Rapier Switch Software Reference
Resetting Ethernet ports at the hardware level discards all frames queued for reception or transmission on the port, and restarts autonegotiation of port speed and duplex mode. Ports are reset using the command:
RESET SWITCH PORT={port-list|ALL} [COUNTER]
To display information about switch ports, use the command:
SHOW SWITCH PORT[={port-list|ALL}]
Figure 3: Example output from the SHOW SWITCH PORT command.
Switch Port Information
---------------------------------------------------------------------------
Port .......................... 1
Description ................... To intranet hub, port 4
Status ........................ ENABLED
Link State .................... Up
UpTime ........................ 00:10:49
Port Media Type ............... ISO8802-3 CSMACD
Configured speed/duplex ....... Autonegotiate
Actual speed/duplex ........... 1000 Mbps, full duplex
Configured master/slave mode .. Autonegotiate
Actual master/slave mode ...... Master
Acceptable Frame Types ........ Admit All Frames
Broadcast rate limit .......... 1000/s
Multicast rate limit .......... -
DLF rate limit ................ -
Learn limit ................... -
Intrusion action .............. Trap
Current learned, lock state ... 15, not locked
Mirroring ..................... Tx, to port 22
Is this port mirror port ...... No
Enabled flow control(s) ....... Jamming
Pause Send tagged pkts for VLAN(s) .. marketing (87) sales (321)
Port-based VLAN ............... accounting (42)
Ingress Filtering ............. OFF
Trunk Group ................... -
STP ........................... company
Multicast filtering mode ...... (B) Forward all unregister groups
---------------------------------------------------------------------------
Table 6: Parameters in the output of the SHOW SWITCH PORT command
Parameter Meaning
Port The number of the switch port.
Description A description of the port.
Status The state of the port; one of “ENABLED” or “DISABLED”.
Link state The link state of the port, one of “Up” or “Down”.
Uptime The count in hours:minutes:seconds of the elapsed time
since the port was last reset or initialised.
Port Media Type The MAC entity type as defined in the MIB object ifType.
Configured speed/duplex The port speed and duplex mode configured for this port.
One of “Autonegotiate” or a combination of a speed (one of “10 Mbps”, “100 Mbps” or “1000 Mbps”) and a duplex mode (one of “half duplex” or “full duplex”).
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Table 6: Parameters in the output of the SHOW SWITCH PORT command
Parameter Meaning
Actual speed/duplex The port speed and duplex mode that this port is actually
running at. A combination of a speed (one of “10 Mbps”, “100 Mbps” or “1000 Mbps”) and a duplex mode (one of “half duplex” or “full duplex”).
Configured master/slave mode The master/slave mode configured for this port; one of
“Autonegotiate’, “Master”, “Slave” or “Not applicable”.
Actual master/slave mode The master/slave mode actually selected; one of “-”,
“Master”, “Slave” or “Not applicable”.
Acceptable Frames Types The value of the Acceptable Frames Type parameter, one of:
“Admit All Frames” or “Admit Only VLAN-tagged Frames”.
Broadcast rate limit The limit of the rate of reception of broadcast frames for
this port, in frames per second.
Multicast cast rate limit The limit of the rate of reception of multicast frames for this
port, in frames per second.
DLF rate limit The limit of the rate of reception of DLF (destination lookup
failure) frames for this port, in frames per second.
Learn limit The number of MAC addresses that may be learned for this
port. Once the limit is reached, the port is locked against any new MAC addresses. One of “None” or a number from 1 to 256.
Intrusion action The action taken on this port when a frame is received from
an unknown MAC address when the port is locked. One of “None”, “Discard”, “Trap” or “Disable”.
Current learned, lock state The number of MAC addresses currently learned on this
port and the state of locking for this port. The lock state is one of “not locked”, “locked by limit” or “locked by command”.
Mirroring The traffic mirroring for traffic in and out of this port. One
of “None”, “Rx” (for traffic received by this port), “Tx” (for traffic sent on this port) or “Both”. The port to which mirrored frames are being sent is also displayed.
Is this port mirror port Whether or not this port is a mirror port. One of “No” or
“Yes”.
Enabled flow control(s) Flow control parameters set for the port; zero, one or two
of ”Jamming” and “Pause”. If flow control is implemented on the switch, then this kind of flow control is applied to the port.
Send tagged pkts for VLAN(s) The name and VLAN Identifier (VID) of the tagged VLAN(s),
if any, to which the port belongs.
Port-based VLAN The name and VLAN Identifier (VID) of the port-based VLAN
to which the port belongs.
Ingress Filtering The state of Ingress Filtering: one of “ON” or “OFF”.
Trunk Group Name of trunk group to which the port belongs, if any.
STP The name of the STP to which the port belongs.
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32 Rapier Switch Software Reference

Autonegotiation of Port Speed and Duplex Mode

Each of the switch ports can operate at either 10 Mbps or 100 Mbps, in either full duplex or half duplex mode. In full duplex mode a port can transmit and receive data simultaneously, while in half duplex mode the port can either transmit or receive, but not at the same time. This versatility makes it possible to connect devices with different speeds and duplex modes to different ports on the switch. Such versatility also requires that each port on the switch know which speed and mode to use.
Autonegotiation allows the ports to adjust their speed and duplex mode to accommodate the devices connected to them. Each switch port can be either configured with a fixed speed and duplex mode, or configured to autonegotiate speed and duplex mode with a device connected to it to determine a speed and mode that will allow successful transmission. An autonegotiating port will adopt the speed and duplex mode required by devices connected to it. If another autonegotiating device is connected to the switch, they will negotiate the highest possible common speed and duplex mode (Table 7). Setting the port to a fixed speed and duplex mode allows it to support equipment that cannot autonegotiate.
It is also possible to require a port to operate at a single speed without disabling autonegotiation by allowing the port to autonegotiate but constrain the speed/duplex options to the desired combination. For example, if one end of a link is set to AUTO and other to 100MFULL then the AUTO end will select 100MHALF operation because without the other end autonegotiating the AUTO end has no way of knowing that the fixed end is full duplex capable. If a particular speed is required it is usually preferable to fix the speed/duplex combination using one of the autonegotiating speed values. Therefore, using 100MFAUTO at one end of a link and will allow the AUTO end to autonegotiate 100MFULL.
Switch ports will autonegotiate by default when they are connected to a new device. To change this setting, use the command:
SET SWITCH PORT={port-list|ALL}
SPEED={AUTONEGOTIATE|10MHALF|10MFULL|10MHAUTO|10MFAUTO|10 0MHALF|100MFULL|100MHAUTO|100MFAUTO|1000MHALF|1000MFULL|1 000MHAUTO|1000MFAUTO}
Autonegotiation can also be activated at any time after this, on any port that is set to autonegotiate, by using the command:
ACTIVATE SWITCH PORT={port-list|ALL} AUTONEGOTIATE
On the first switch, the gigabit uplink ports always use 1000 Mbps speed and operate in full duplex mode, but these ports can also autonegotiate with peers in order to successfully pass the negotiation phase to get to successful operation.
Table 7: Autonegotiation preferences for Ethernet ports.
Rapier 24/48
Speed
10MHALF Yes No No No Yes No Yes
10MFULL Yes No No No Yes No Yes
100MHALF Yes No No No Yes No Yes
100MFULL Yes No No No Yes No Yes
1000MHALF No Yes Yes Yes Ye s N o Ye s
10/100
Rapier 24/48 Cu uplink
Rapier 24/48 fibre uplink Rapier G6f Rapier G6
Rapier G6 fibre uplink
Rapier G6x Cu uplink
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Rapier 24/48
Speed
1000MFULL No Ye s Yes Ye s Ye s Yes Ye s
10MHAUTO Yes No No No Yes No Yes
10MFAUTO Yes No No No Yes No Yes
100MHAUTO Yes No No No Yes Yes Yes
100MFAUTO Yes No No No Yes No Yes
1000MHAUTO No Yes Yes Yes Yes Yes Yes
1000MFA UT O No Yes Yes Yes Ye s Yes Ye s
10/100
Rapier 24/48 Cu uplink
Rapier 24/48 fibre uplink Rapier G6f Rapier G6
Rapier G6 fibre uplink
Rapier G6x Cu uplink
The SHOW SWITCH PORT command displays the port speed and duplex mode settings.

Port Trunking

Port trunking, also known as port bundling or link aggregation, allows a number of ports to be configured to join together to make a single logical connection of higher bandwidth. This can be used where a higher performance link is required, and makes links even more reliable.
The switch supports up to 6 trunk groups, of up to 8 switch ports each. The two gigabit Ethernet ports can also be grouped together to form a trunk group. It is not possible for a trunk group to include both 10/100 Ethernet and gigabit Ethernet ports. Ports in the trunk group do not have to be contiguous. Port trunking is supported between AR800 Series and Rapier switches, and may be compatible with trunking algorithms on third party devices.
Port trunk groups are created and destroyed on the switch using the commands:
CREATE SWITCH TRUNK=trunk [PORT=port-list]
[SELECT={MACSRC|MACDEST|MACBOTH|IPSRC|IPDEST|IPBOTH}] [SPEED={10M|100M|1000M}]
DESTROY SWITCH TRUNK=trunk
Port trunk groups can only be destroyed on the switch if no ports belong to them.
All the ports in a trunk group must belong to the same VLAN. Ports in a trunk group can be added to other VLANs, either as individual ports or as an entire group. A port in a trunk group cannot be deleted from any of the VLAN(s) to which the whole trunk group belongs, unless it is first removed from the trunk group. The members of a trunk group can be specified when it is created, and ports can be added to or removed from a trunk group using the commands:
ADD SWITCH TRUNK=trunk PORT=port-list
DELETE SWITCH TRUNK=trunk PORT={port-list|ALL}
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Ports which are members of a trunk group must operate in full duplex mode. When a port is added to a trunk group, the speed setting for the group overrides the speed setting previously configured for the port. When a port is removed from a trunk group, the port returns to its previously configured speed and duplex mode settings.
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The speed of the trunk group can either be specified when it is created, or set using the command:
SET SWITCH TRUNK=trunk
[SELECT={MACSRC|MACDEST|MACBOTH|IPSRC|IPDEST|IPBOTH}] [SPEED={10M|100M|1000M}]
The SELECT parameter specifies the port selection criterion for the trunk group. Each packet to be sent on the trunk group is checked, using the selection criterion, and a port in the trunk group chosen down which to send the packet. If MACSRC is specified, the source MAC address is used. If MACDEST is specified, the destination MAC address is used. If MACBOTH is specified, both source and destination MAC addresses are used. If IPSRC is specified, the source IP address is used. If IPDEST is specified, the destination IP address is used. If IPBOTH is specified, both the source and destination IP addresses are used. The user of the switch should choose the value of this parameter to try to spread out the load as evenly as possible on the trunk group. The default for this parameter is MACDEST.
The SPEED parameter specifies the speed of the ports in the trunk group. For gigabit ports, only the value 1000M is allowed. For switch ports, values of 10M and 100M are allowed. The default is 100M. When a port is added to a trunk group, its current speed and duplex mode settings are ignored and the port uses the speed of the trunk group and full duplex mode.
To display information about trunks on the switch, use the command:
SHOW SWITCH TRUNK[=trunk]
To display the VLANs to which the ports in the trunk groups belong, use the command:
SHOW VLAN[=ALL]
Port trunking must be configured on both ends of the link, or network loops may result.

Packet Storm Protection

The packet storm protection feature allows the user to set limits on the reception rate of broadcast, multicast and destination lookup failure packets. The software allows separate limits to be set for each port, beyond which each of the different packet types are discarded. The software also allows separate limits to be set for each of the packet types. Which of these options can be implemented depends on the model of switch hardware.
By default, packet storm protection is set to NONE, that is, disabled. It can be enabled, and each of the limits can be set using the command:
SET SWITCH PORT=port-list [BCLIMIT={NONE|limit}]
[DLFLIMIT={NONE|limit}] [MCLIMIT={NONE|limit}]
For the Rapier 16, 24, and 48-port switches, packet storm protection limits cannot be set for each individual port on the switch, but can be set for each processing block of ports. The processing blocks are sets of 8 ports (e.g. as many as are applicable of ports 1-8, 9-16, 17-24, 25-32, 33-40 and 41-48) and each uplink port is a further processing block. Therefore, a 16-port switch has four processing blocks and a 24-port switch has five. The two uplink ports are numbered sequentially after the last port, and therefore are 17 and 18 for a 16­port, 25 and 26 for a 24-port switch. Only one limit can be set per processing
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block, and then applies to all three packet types. Thus each of the packet types are either limited to this value, or unlimited (NONE).
For the Rapier G6 series switches, each port is a processing block, and therefore packet storm protection limits can be set for each port individually.
The BCLIMIT parameter specifies a limit on the rate of reception of broadcast packets for the port(s). The value of this parameter represents a per second rate of packet reception above which packets will be discarded, for broadcast packets. If the value NONE or 0 is specified, then packet rate limiting for broadcast packets is turned off. If any other value is specified, the reception of broadcast packets will be limited to that number of packets per second. See the note below for important information about packet rate limiting. The default value for this parameter is NONE.
The DLFLIMIT parameter specifies a limit on the rate of reception of destination lookup failure packets for the port. The value of this parameter represents a per second rate of packet reception above which packets will be discarded, for destination lookup failure packets. If the value NONE or 0 is specified, then packet rate limiting for destination lookup failure packets is turned off. If any other value is specified, the reception of destination lookup failure packets will be limited to that number of packets per second. See the note after the BCLIMIT parameter description for important information about packet rate limiting. The default value for this parameter is NONE. If packet storm protection limits are set on the switch, the PORT parameter must specify complete processing blocks.
A destination lookup failure packet is one for which the switch hardware does not have a record of the destination address of the packet, either Layer 2 or Layer 3 address. These packets are passed to the CPU for further processing, so limiting the rate of reception of these packets may be a desirable feature to improve system performance.
The MCLIMIT parameter specifies a limit on the rate of reception of multicast packets for the port. The value of this parameter represents a per second rate of packet reception above which packets will be discarded, for multicast packets. If the value NONE or 0 is specified, then packet rate limiting for multicast packets is turned off. If any other value is specified, the reception of multicast packets will be limited to that number of packets per second. See the note after the BCLIMIT parameter description for important information about packet rate limiting. The default value for this parameter is NONE. If packet storm protection limits are set on the switch, the PORT parameter must specify complete processing blocks.
The ability of the switch to limit packet reception rates for different classes of packets is dependent on the particular switch hardware. In particular, groups of ports may have to have the same limits set, and the same limit may be set for the different types of packets, depending on the hardware. Whenever packet rate limits are set on switches which have this type of constraint, the latest parameter values entered will supersede earlier values. When a command entered for specified ports changes the parameters for other ports, a message will indicate these changes.
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The SHOW SWITCH PORT command displays the packet storm protection settings (Figure 3 on page 30).
SHOW SWITCH PORT=port-list
36 Rapier Switch Software Reference

Port Mirroring

Port mirroring allows traffic being received and transmitted on a switch port to be sent to another switch port, the mirror port, usually for the purposes of capturing the data with a protocol analyser. This mirror port is the only switch port which belongs to no VLANs, and therefore does not participate in any other switching. Before the mirror port can be set, it must be removed from all VLANs except the default VLAN. The port cannot be part of a trunk group.
To set the mirror port (and remove it from the default VLAN) use the command:
SET SWITCH MIRROR={NONE|port}
If another port was previously set as the mirror port, this command returns the previous mirror port to the default VLAN as an untagged port. Return this port to any VLANs to which it should belong, using the ADD VLAN PORT command, or set it as a tagged port using the SET VLAN PORT command if required.
Either traffic received on a port or traffic transmitted by the port, or both, can be mirrored. This setting and the source port(s) from which traffic is sent to the mirror port are specified using the command:
SET SWITCH PORT={port-list|ALL} MIRROR={NONE|RX|TX|BOTH}
Mirroring four or more ports may significantly reduce switch performance.
The MIRROR parameter specifies the role of these port(s) as a source of mirror traffic. If NONE is specified, no traffic received or sent on these port(s) will be mirrored. If RX is specified, all traffic received on these port(s) will be mirrored. If TX is specified, all traffic transmitted on these port(s) will be mirrored. If BOTH is specified, all traffic received and transmitted will be mirrored. Traffic will actually only be mirrored if there is a mirror port defined and if mirroring is enabled. The default is NONE.
To send packets that match particular criteria to the mirror port, first create a classifier or classifiers using the command:
CREATE CLASSIFIER
Then create a hardware filter with the ACTION parameter set to SENDMIRROR, using the command:
ADD SWITCH HWFILTER CLASSIFIER=classifier-list
ACTION=SENDMIRROR
By default mirroring is disabled, no mirror port is set, and no source ports are set to be mirrored. Mirroring can only be enabled after the switch mirror port has been set to a valid port. If mirroring has been enabled but the switch mirror port is set to NONE, then mirroring will be disabled. Mirroring is enabled and disabled using the commands:
ENABLE SWITCH MIRROR
DISABLE SWITCH MIRROR
The SHOW SWITCH PORT and SHOW SWITCH commands display the switch and port mirroring settings.
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Port security

The port security feature allows control over the stations connected to each switch port, by MAC address. If enabled on a port, the switch will learn MAC addresses up to a user-defined limit from 1 to 256, then lock out all other MAC addresses. One of the following options can be specified for the action taken when an unknown MAC address is detected on a locked port:
Discard the packet and take no further action,
Discard the packet and notify management with an SNMP trap,
Discard the packet, notify management with an SNMP trap and disable the port.
To enable port security on a port, set the limit for learned MAC addresses to a value greater than zero, and specify the action to take for unknown MAC addresses on a locked port. To disable port security on a port, set the limit for learned MAC addresses to zero or NONE. Port security can be enabled or disabled on a port using the command:
SET SWITCH PORT={port-list|ALL} LEARN={NONE|0|1..256}
[INTRUSIONACTION={NONE|DISCARD|TRAP|DISABLE}]
The INTRUSIONACTION parameter specifies the action taken when the port(s) receive packets from addresses which are not part of the learned list of addresses as specified by the LEARN parameter. If DISCARD is specified, packets received from MAC addresses not on the port’s learn list will be discarded. If TRAP is specified, packets received from MAC addresses not on the port’s learn list will be discarded and an SNMP trap will be generated. If DISABLE is specified, the first time a packet is received from a MAC address not on the port’s learn list, it will be discarded, an SNMP trap will be generated and the port(s) will be disabled. To re-enable the port, disable the Port Security function on the port. The default value for this parameter is DISCARD.
If INTRUSIONACTION is set to TRAP or DISABLE, a list of MAC addresses for devices that are active on a port, but which are not allowed or learned for the port, can be displayed using the command:
SHOW SWITCH PORT={port-list|ALL} INTRUSION
Table 8: Example output from the SHOW SWITCH PORT INTRUSION command.
Switch Port Information
---------------------------------------------------------------------------­Port 2 - 13 intrusion(s) detected 00-00-c0-1d-2c-f8 00-90-27-87-a5-22 00-00-cd-01-00-4a 00-d0-b7-4d-93-c0 08-00-5a-a1-02-3f 00-d0-b7-d5-5f-a9 00-b0-d0-20-d1-01 00-90-99-0a-00-49 00-10-83-05-72-83 00-00-cd-00-45-9e 00-00-c0-ad-a3-d0 00-a0-24-8e-65-3c 00-90-27-32-ad-61
----------------------------------------------------------------------------
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A switch port can be manually locked before it reaches the learning limit, by using the command:
ACTIVATE SWITCH PORT={port-list|ALL} LOCK
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Addresses can be manually added to a port locked list up to a total of 256 MAC addresses, and the learning limit can be extended to accommodate them, by using the command:
ADD SWITCH FILTER ACTION={FORWARD|DISCARD} DESTADDRESS=macadd
PORT=port [ENTRY=entry] [LEARN] [VLAN={vlanname|1..4094}]
Learned addresses on locked ports can be saved as part of the switch configuration, so that they will be part of the configuration after a power cycle, using the command:
CREATE CONFIG=filename
If the configuration is not saved when there is a locked list for a port, the learning process begins again after the router is restarted.

Virtual Local Area Networks (VLANs)

A Virtual LAN (VLAN) is a logical, software-defined subnetwork. It allows similar devices on the network to be grouped together into one broadcast domain, irrespective of their physical position in the network. Multiple VLANs can be used to group workstations, servers, and other network equipment connected to the switch, according to similar data and security requirements.
Decoupling logical broadcast domains from the physical wiring topology offers several advantages, including the ability to:
Move devices and people with minimal, or no, reconfiguration
Change a device’s broadcast domain and access to resources without physically moving the device, by software reconfiguration or by moving its cable from one switch port to another
Isolate parts of the network from other parts, by placing them in different VLANs
Share servers and other network resources without losing data isolation or security
Direct broadcast traffic to only those devices which need to receive it, to reduce traffic across the network
Connect 802.1Q-compatible switches together through one port on each switch
Devices that are members of the same VLAN only exchange data with each other through the switch’s switching capabilities. To exchange data between devices in separate VLANs, the switch’s routing capabilities are used. The switch passes VLAN status information, indicating whether a VLAN is up or down, to the Internet Protocol (IP) module. IP uses this information to determine route availability.
The switch has a maximum of 4094 VLANs, ranging from a VLAN identifier (VID) of 1 to 4094. When the switch is first powered up, a “default” VLAN is created and all ports are added to it. In this initial unconfigured state, the switch will broadcast all the packets it receives to the default VLAN. This VLAN has a VID of 1 and an interface name of vlan1. It cannot be deleted, and ports can only be removed from it if they also belong to at least one other
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VLAN. The default VLAN cannot be added to any STP, but always belongs to the default STP. If all the devices on the physical LAN are to belong to the same logical LAN, that is, the same broadcast domain, then the default settings will be acceptable, and no additional VLAN configuration is required.

VLAN Tagging

An Ethernet packet can contain a VLAN tag, with fields that specify VLAN membership and user priority. The VLAN tag is described in IEEE Standard
802.3ac, and is four octets that can be inserted between the Source Address and the Type/Length fields in the Ethernet packet (Figure 1-1 on page 39). To accommodate the tag, Standard 802.3ac also increased the maximum allowable length for an Ethernet frame to 1522 octets (the minimum size is 64 octets). IEEE Standard 802.1Q specifies how the data in the VLAN tag is used to switch frames. VLAN-aware devices are able to add the VLAN tag to the packet header. VLAN-unaware devices cannot set or read the VLAN tag.
Table 9 on page 39 lists the meaning and use of the fields in the Ethernet frame. Figure 1-1 on page 39 shows the format of VLAN data in an Ethernet frame. Twelve bits of the tag are the VLAN Identifier (VID), which indicates the VLAN that the packet belongs to. Table 10 on page 40 lists the VLAN Identifier values that have specific meaning.
Table 9: Fields in the Ethernet frame for QoS and VLAN switching.
Field Length Meaning and use
TPID 2 octets The Tag Protocol Identifier (TPID) is defined by IEEE Standard
802.1Q as 0x81-00.
User Priority 3 bits The User Priority field is the priority tag for the frame, which
can be used by the switch to determine the Quality of Service to apply to the frame. The three bit binary number represents eight priority levels, 0 to 7.
CFI 1 bit The Canonical Format Indicator (CFI flag) is used to indicate
whether all MAC address information that may be present in the MAC data carried by the frame is in canonical format.
VID 12 bits The VLAN Identifier (VID) field uniquely identifies the VLAN
to which the frame belongs.
Figure 1-1: Format of user priority and VLAN data in an Ethernet frame.
Preamble
64 bits
Destination
Address
48 bits 48 bits
Source
Address
Type/
Length
16
bits
Frame Data
368-12000
CRC
32 bits
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TPID
16 bits
0x81-00
User
Priority
3 bits
CFI VID
1 bit
12 bits
SWITCH6
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Table 10: Reserved VID values .
VID value (hexadecimal) Meaning and use of reserved VID values
0 The null VLAN ID. Indicates that the tag header contains only
user priority information; no VLAN Identifier is present in the frame. This VID value must not be configured in any Forwarding Database entry, or used in any management operation. Frames that contain the null VLAN ID are also known as priority-tagged frames.
1 The default VID value used for classifying frames on ingress
through an untagged switch port.
FFF Reserved for implementation use. This VID value must not be
configured in any Forwarding Database entry, used in any management operation, or transmitted in a tag header.
Ethernet packets which contain a VLAN tag are referred to as tagged frames, and switch ports that transmit tagged frames are referred to as tagged ports. Ethernet packets which do not contain the VLAN tag are referred to as untagged frames, and switch ports that transmit untagged frames are referred to as untagged ports. VLANs can consist of simple logical groupings of untagged ports, in which the ports receive and transmit untagged packets. Alternatively, VLANs can contain only tagged ports, or a mixture of tagged and untagged ports.
The switch is VLAN aware. It can accept VLAN tagged frames, and supports the VLAN switching required by such tags. A network can contain a mixture of VLAN aware devices, for example, other 802.1Q-compatible switches, and VLAN unaware devices, for example, workstations and legacy switches that do not support VLAN tagging. The switch can be configured to send VLAN tagged or untagged frames on each port, depending on whether or not the devices connected to the port are VLAN aware. By assigning a port to two different VLANs, to one as an untagged port and to another as a tagged port, it is possible for the port to transmit both VLAN-tagged and untagged frames. A port must belong to a VLAN at all times unless the port has been set as the mirror port for the switch.
Every frame admitted by the switch has a VID associated with it. If a frame arrives on a tagged port, the associated VID is determined from the VLAN tag the frame had when it arrived. If a frame arrives on an untagged port, it is associated with the VID of the VLAN for which the incoming port is untagged. When the switch forwards a frame over a tagged port, it adds a VLAN tag to the frame. When the switch forwards the frame over an untagged port, it transmits the frame as a VLAN-untagged frame, not including the VID in the frame.
The VLAN tag that the switch adds to a frame on egress depends on whether the frame is switched in Layer 3 or Layer 2. In Layer 3 switching, the switch determines the destination VLAN from its routing tables. The VID of the destination VLAN will be added to the frame on egress. In Layer 2 switching, the frame’s source and destination VLANs are the same. The VID that was associated with the frame on ingress will be associated with it on egress.
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VLAN Membership using VLAN Tags
Ports can belong to many VLANs as tagged ports. Therefore, when the VLAN tag is used to determine which VLAN a packet belongs to, it is easy to:
Share network resources, such as servers and printers, across several VLANs
Configure VLANs that span several switches
For tagged ports, the switch uses the VID of incoming frames, and the frame’s destination field to switch traffic through a VLAN aware network. Frames are only transmitted on ports belonging to the required VLAN. Other vendors’ VLAN aware devices on the network can be configured to accept traffic from one or more VLANs. A VLAN-aware server can be configured to accept traffic from many different VLANs, and then return data to each VLAN without mixing or leaking data into the wrong VLANs.
Figure 1-2 on page 41 shows a network configured with VLAN tagging. Table 11 on page 42 shows the VLAN membership. The server on port 2 on Switch A belongs to both the admin and marketing VLANs. The two switches are connected through uplink port 26 on Switch A and uplink port 25 on Switch B, which belong to both the marketing VLAN and the training VLAN, so devices on both VLANs can use this link.
Figure 1-2: VLANs with tagged ports.
Port 3
Switch A
Port 2
Port 26
Port 4Port 1
Marketing VLAN VID=4Admin VLAN VID=2
Training VLAN VID=3
Port 25
411
Port 22
Port 21
Switch B
Port 23
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VLAN-aware
server
SWITCH3
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Table 11: VLAN membership of example of a network using tagged ports.
VLAN Member ports
Training 3, 26 on Switch A
21, 22, 25 on Switch B
Marketing 2, 4, 26 on Switch A
23, 25 on Switch B
Admin 1, 2 on Switch A

VLAN Membership of Untagged Packets

A VLAN that does not send any VLAN-tagged frames is a logical grouping of ports. All untagged traffic arriving at those ports belongs to that VLAN.
VLANs based on untagged ports are limited, because each port can only belong to one VLAN as an untagged port. Limitations include:
It is difficult to share network resources, such as servers and printers, across several VLANs. The routing functions in the switch must be configured to interconnect using untagged ports only.
A VLAN that spans several switches requires a port on each switch for the interconnection of the various parts of the VLAN. If there are several VLANs in the switch that span more than one switch, then many ports are occupied with connecting the VLANs, and so are unavailable for other devices.
If the network includes VLANs that do not need to share network resources or span several switches, VLAN membership can usefully be based on untagged ports. Otherwise, VLAN membership should be determined by tagging (see “VLAN Tagging” on page 39).
Figure 1-3 on page 43 shows two port-based VLANs with untagged ports belonging to them. Ports 1-3 belong to the marketing VLAN, and ports 14-16 belong to the training VLAN. The switch acts as two separate bridges: one that forwards traffic between the ports belonging to the marketing VLAN, and a second one that forwards traffic between the ports belonging to the training VLAN. Devices in the marketing VLAN can only communicate with devices in the training VLAN by using the switch’s routing functions.
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Figure 1-3: VLANS with untagged ports.
Port 1
Switch
Port 14
Port 2
Marketing VLAN
Training VLAN
Port 15
411
Port 3
Port 16

Creating VLANs

To briefly summarise the process of creating a VLAN:
1. Create the VLAN.
SWITCH2
2. Add tagged ports to the VLAN, if required.
3. Add untagged ports to the VLAN, if required.
To create a VLAN, use the command:
CREATE VLAN=vlan-name VID=2..4094
Every port must belong to a VLAN, unless it is the mirror port. By default, all ports belong to the default VLAN as untagged ports.
To add tagged ports to a VLAN, use the command:
ADD VLAN={vlan-name|1..4094} PORT={port-list|ALL}
FRAME=TAGGED
A port can be tagged for any number of VLANs.
To add untagged ports to a VLAN, use the command:
ADD VLAN={vlan-name|1..4094} PORT={port-list|ALL}
[FRAME=UNTAGGED]
A port can be untagged for zero or one VLAN. A port can only be added to the default VLAN as an untagged port if it is not untagged for another VLAN. A
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port cannot transmit both tagged and untagged frames for the same VLAN (that is, it cannot be added to a VLAN as both a tagged and an untagged port).
To remove ports from a VLAN, use the command:
DELETE VLAN={vlan-name|1..4094} PORT={port-list|ALL}
Removing an untagged port from a VLAN will return it to the default VLAN, unless it is a tagged port for another static VLAN. An untagged port can only be deleted from the default VLAN if the port is a tagged port for another static VLAN.
Ports tagged for some VLANs and left in the default VLAN as untagged ports will transmit broadcast traffic for the default VLAN. If this is not required, the unnecessary traffic in the switch can be reduced by deleting those ports from the default VLAN.
To change the tagging status of a port in a VLAN, use the command:
SET VLAN={vlan-name|1..4094} PORT={port-list|ALL}
FRAME=TAGGED
To destroy a VLAN, use the command:
DESTROY VLAN={vlan-name|2..4094|ALL}
VLANs can only be destroyed if no ports belong to them.
To display the VLANs configured on the switch, use the command:
SHOW VLAN[={vlan-name|1..4094|ALL}]
Information which may be useful for trouble-shooting a network can be displayed with the VLAN debugging mode. This is disabled by default, and can be enabled for a specified time, disabled, and displayed using the commands:
ENABLE VLAN={vlan-name|1..4078|ALL} DEBUG={PKT|ALL}
[OUTPUT=CONSOLE] [TIMEOUT={1..4000000000|NONE}]
DISABLE VLAN={vlan-name|1..4078|ALL} DEBUG={PKT|ALL}
SHOW VLAN DEBUG
To view packet reception and transmission counters for a VLAN, use the command (see the Interfaces chapter of the switch’s Software Reference):
SHOW INTERFACE=VLANn COUNTER

Summary of VLAN tagging rules

When designing a VLAN and adding ports to VLANs, the following rules apply.
1. Each port, except for the mirror port, must belong to at least one static
VLAN. By default, a port is an untagged member of the default VLAN.
2. A port can be untagged for zero or one VLAN. A port that is untagged for
a VLAN transmits frames destined for that VLAN without a VLAN tag in the Ethernet frame.
3. A port can be tagged for zero or more VLANs. A port that is tagged for a
VLAN transmits frames destined for that VLAN with a VLAN tag, including the numerical VLAN Identifier of the VLAN.
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4. A port cannot be untagged and tagged for the same VLAN.
5. The mirror port, if there is one, is not a member of any VLAN.

Protected VLANs

If a VLAN is Protected, Layer 2 traffic between ports that are members of a Protected VLAN is blocked. Traffic can be Layer 3 switched to another VLAN. This feature prevents members of a Protected VLAN from communicating with each other yet still allows members to access another network. Layer 3 Routing between Ports in a Protected VLAN can be prevented by adding a Layer 3 filter. The Protected VLAN feature also allows all of the members of the Protected VLAN to be in the same subnet.
A typical application is a hotel installation where each room has a port that can be used to access the Internet. In this situation it is undesirable to allow communication between rooms.
To create a Protected VLAN, use the command:
CREATE VLAN=vlan-name VID=2..4094 [PROTECTED]

VLAN Interaction with STPs and Trunk Groups

Each VLAN and port can only belong to one Spanning Tree entity (STP). A port cannot be added to a VLAN that is in a different STP from the VLANs to which the port already belongs, with one exception. The exception is that an untagged port in the default VLAN can be moved from the default VLAN to any other VLAN in any STP, if the port belongs only to the default VLAN as an untagged port.
For Rapier i Series switches only, a port can belong to more than one STP, and a VLAN may have ports in more than one STP. VLANs can belong to multiple STPs.
All the ports in a trunk group must have the same VLAN configuration: they must belong to the same VLANs and have the same tagging status, and can only be operated on as a group.

Generic VLAN Registration Protocol (GVRP)

The GARP application GVRP allows routers in a network to dynamically share VLAN membership information, to reduce the need for statically configuring all VLAN membership changes on all switches in a network. See the Generic
Attribute Registration Protocol (GARP) chapter in the Rapier Switch Software Reference.
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Layer 2 Switching Process

The Layer 2 switching process comprises related but separate processes. The
Ingress Rules admit or discard frames based on their VLAN tagging. The Learning Process learns the MAC addresses and VLAN membership of frames
admitted on each port. The Forwarding Process determines which ports the frames are forwarded to, and the Quality of Service priority with which they are transmitted. Finally, the Egress Rules determine for each frame whether VLAN tags are included in the Ethernet frames that are transmitted. These processes assume that each station on the extended LAN has a unique data link layer address, and that all data link layer frames have a header which includes the source (sender’s) MAC address and destination (recipient’s) MAC address.

The Ingress Rules

When a frame first arrives at a port, the Ingress Rules for the port check the VLAN tagging in the frame to determine whether it will be discarded or forwarded to the Learning Process.
The first check depends on whether the Acceptable Frame Types parameter is set to Admit All Frames or to Admit Only VLAN Tagged Frames. A port that transmits only VLAN tagged frames, regardless of which VLAN the port belongs to, will be automatically set to Admit Only VLAN Tagged Frames. The user cannot change this setting. Frames with a null numerical VLAN Identifier (VID) are VLAN-untagged frames, or frames with priority tagging only.
Every frame received by the switch must be associated with a VLAN. If a frame is admitted by the Acceptable Frame Types parameter, the second part of the Ingress Rules associates each untagged frame admitted with the VID of the VLAN for which the port is untagged.
Every port belongs to one or more VLANs, and therefore every incoming frame will have a VID to show which VLAN it belongs to. The final part of the Ingress Rules depends on whether Ingress Filtering is enabled for the port. If Ingress Filtering is disabled, all frames are passed on to the Learning Process, regardless of which VLAN they belong to. If Ingress Filtering is enabled, frames are admitted only if they have the VID of a VLAN to which the port belongs. If they have the VID of a VLAN to which the port does not belong, they are discarded.
The default settings for the Ingress Rules are to Admit All Frames, and for Ingress Filtering to be OFF. This means that if no VLAN configuration has been done, all incoming frames pass on to the Learning Process, regardless of whether or not they are VLAN tagged. The parameters for each port’s Ingress Rules can be configured using the command:
SET SWITCH PORT={port-list|ALL} [ACCEPTABLE={VLAN|ALL}]
[INFILTERING={ON|OFF}] [other-parameters...]
The ACCEPTABLE parameter sets the Acceptable Frame Types parameter, in the Ingress Rules, which controls reception of VLAN-tagged and VLAN­untagged frames on the port. If ALL is specified, then the Acceptable Frame Types parameter is set to Admit All Frames. If VLAN is specified, the parameter is set to Admit Only VLAN-tagged Frames, and any frame received that carries a null VLAN Identifier (VID) is discarded by the ingress rules. Untagged frames and priority-tagged frames carry a null VID. Untagged frames admitted according to the ACCEPTABLE parameter have the VID of the VLAN for which the port is untagged associated with them. The
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ACCEPTABLE parameter can only be set if the port is untagged for one VLAN. In this case, the default is ALL, admitting all tagged and untagged frames. If the port is tagged for all the VLANs to which it belongs, the ACCEPTABLE parameter is automatically set to VLAN, and cannot be changed to admit untagged frames.
The INFILTERING parameter enables or disables Ingress Filtering of frames admitted according to the ACCEPTABLE parameter, on the specified ports. Each port on the switch belongs to one or more VLANs. If INFILTERING is set to ON, Ingress Filtering is enabled: any frame received on a specified port is only admitted if the port belongs to the VLAN with which the frame is associated. Conversely, any frame received on the port is discarded if the port does not belong to the VLAN with which the frame is associated. Untagged frames admitted by the ACCEPTABLE parameter are admitted, since they have the numerical VLAN Identifier (VID) of the VLAN for which the port in an untagged member. If OFF is specified, Ingress Filtering is disabled, and no frames are discarded by this part of the Ingress Rules. The default setting is OFF.
To display the current Ingress Rules, use the command:
SHOW SWITCH PORT=port-list

The Learning Process

The Learning Process uses an adaptive learning algorithm, sometimes called backward learning, to discover the location of each station on the extended LAN.
All frames admitted by the Ingress Rules on any port are passed on to the Forwarding Process if they are for destinations within the same VLAN. Frames destined for other VLANs are passed to the layer three protocol, for instance IP. For every frame admitted, the frame’s source MAC address and numerical VLAN Identifier (VID) are compared with entries in the Forwarding Database for the VLAN (also known as a MAC address table, or a forwarding table) maintained by the switch. The Forwarding Database contains one entry for every unique station MAC address the switch knows in each VLAN.
If the frame’s source address is not already in the Forwarding Database for the VLAN, the address is added and an ageing timer for that entry is started. If the frame’s source address is already in the Forwarding Database, the ageing timer for that entry is restarted. By default, switch learning is enabled, and it can be disabled or enabled using the commands:
DISABLE SWITCH LEARNING
ENABLE SWITCH LEARNING
If the ageing timer for an entry in the Forwarding Database expires before another frame with the same source address is received, the entry is removed from the Forwarding Database. This prevents the Forwarding Database from being filled up with information about stations that are inactive or have been disconnected from the network, while ensuring that entries for active stations are kept alive in the Forwarding Database. By default, the ageing timer is enabled, and it can be disabled or enabled using the commands:
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ENABLE SWITCH AGEINGTIMER
DISABLE SWITCH AGEINGTIMER
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If switch learning is disabled and the ageing timer has aged out all dynamically learned filter entries, only statically entered MAC source addresses will be used to decide which packets to forward or discard. If the switch finds no matching entries in the Forwarding Database during the Forwarding Process, then all switch ports in the VLAN will be flooded with the packet, except the port on which the packet was received.
The default value of the ageing timer is 300 seconds (5 minutes), and this can be modified using the command:
SET SWITCH AGEINGTIMER=10..1000000
The Forwarding Database relates a station’s (source) address to a port on the switch, and is used by the switch to determine from which port (if any) to transmit frames with a destination MAC address matching the entry in the station map.
To display the contents of the Forwarding Database, use the command:
SHOW SWITCH FDB [ADDRESS=macadd]
[DISCARD={SOURCE|DESTINATION}] [HIT={YES|NO}] [L3={YES|NO}] [PORT={portlist|ALL}] [STATUS={STATIC|DYNAMIC}] [VLAN={vlanname|1..4094}]
To display general switch settings, including settings for switch learning and the switch aging timer, use the command:
SHOW SWITCH

The Forwarding Process

The Forwarding Process forwards received frames that are to be relayed to other ports in the same VLAN, filtering out frames on the basis of information contained in the station map and on the state of the ports. If a frame is received on the port for a destination in a different VLAN, it is either Layer 3 switched if it is an IP packet, or looked up in the Layer 3 routing tables (see the Rapier Switch Software Reference.)
Forwarding occurs only if the port on which the frame was received is in the Spanning Tree ‘Forwarding’ state. The destination address is then looked up in the Forwarding Database for the VLAN. If the destination address is not found, the switch floods the frame on all ports in the VLAN except the port on which the frame was received. If the destination address is found, the switch discards the frame if the port is not in the STP ‘Forwarding’ state, if the destination address is on the same port as the source address, or if there is a static filter entry for the destination address set to DISCARD (“Layer 2 Filtering” on page 49). Otherwise, the frame is forwarded on the indicated port.
This whole process can further be modified by the action of static switch filters. These are configurable filters which allow switched frames to be checked against a number of entries.
The Forwarding Process provides storage for queued frames to be transmitted over a particular port or ports. More than one transmission queue may be provided for a given port. Which transmission queue a frame is sent to is determined by the user priority tag in the Ethernet frame, and the Quality of Service mapping.
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Layer 2 Filtering

The switch has a Forwarding Database, entries in which determine whether frames are forwarded or discarded over each port. Entries in this Forwarding Database are created dynamically by the Learning Process. A dynamic entry is automatically deleted from the Forwarding Database when its ageing timer expires. Filtering is specified in the IEEE 802.1D Standard “Media Access Control (MAC) Bridges”.
The user can configure static switch filter entries using the command line interface. Static switch filter entries associate a MAC address with a VLAN and a port in the VLAN. When the switch receives a frame with a destination address and VLAN Identifier that match those of a static filter entry, the frame can be either forwarded to the port specified in the static filter entry, or discarded.
The Forwarding Database supports queries by the Forwarding Process as to whether frames with given values of the destination MAC address field should be forwarded to a given port.
To add or delete static switch filter entries, use the commands:
ADD SWITCH FILTER DESTADDRESS=macadd ACTION={FORWARD|DISCARD}
PORT[=port-list] [ENTRY=entry] [VLAN={vlanname|1..4094}]
DELETE SWITCH FILTER ENTRY=entry-list
The switch automatically deletes static filter entries for a port if the port is deleted from the specified VLAN.
To display current static switch filter entries, use the command:
SHOW SWITCH FILTER [DESTADDRESS=macadd] [ENTRY=entry]
[PORT=port-list] [VLAN={vlanname|1..4094}]
Figure 2: Example output from the SHOW SWITCH FILTER command.
Switch Filters
--------------------------------------------------------------------------­ Entry VLAN Destination Address Port Action Source
--------------------------------------------------------------------------­ 0 default (1) aa-ab-cd-00-00-01 1 Forward static 1 default (1) aa-ab-cd-00-00-02 1 Forward static
0 marketing (2) aa-ab-cd-00-00-01 2 Discard static 1 marketing (2) aa-ab-cd-00-00-02 2 Discard learn
---------------------------------------------------------------------------
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Table 12: Parameters in the output of the SHOW SWITCH FILTER command
Parameter Meaning
Entry The number identifying the filter entry.
Destination Address The destination MAC address for the entry.
VLAN The VLAN name and identifier for the entry.
Port The outbound port to match for the filter entry to be applied.
Action The action specified by the filter entry; one of “Forward” or
“Discard”.
50 Rapier Switch Software Reference
Table 12: Parameters in the output of the SHOW SWITCH FILTER command
Parameter Meaning
Source This parameter is either “static” (indicating the filter is a static
filter) or “learned” (indicating the filter is present either because it has been added with the LEARN parameter of the SET SWITCH PORT command, or has been dynamically learned during normal intrusion detection operation).
For each VLAN, the destination MAC address of a frame to be forwarded is checked against the Forwarding Database. If there is no entry for the destination address and VLAN, the frame is transmitted on all ports in the VLAN that are in the ‘Forwarding’ or ‘Disabled’ states, except the port on which the frame was received. This process is referred to as flooding. If an entry is found in the Forwarding Database, but the entry is not marked as ‘Forwarding’ or the entry points to the same port the frame was received on, the frame is discarded. Otherwise, the frame is transmitted on the port specified by the entry in the Forwarding Database.
A dynamic entry is automatically deleted from the Forwarding Database when its ageing timer expires.

The Egress Rules

Once the Forwarding Process has determined which ports and transmission queues to forward a frame from, the Egress Rules for each port determine whether or not the outgoing frame is VLAN-tagged with its numerical VLAN Identifier (VID). (See “Virtual Local Area Networks (VLANs)” on page 38).
When a port is added to a VLAN, it is configured to transmit either untagged or VLAN tagged packets, using the command:
ADD VLAN={vlanname|1..4094} PORT={port-list|ALL}
[FRAME={TAGGED|UNTAGGED}]
This setting can be changed for a port which is already part of a VLAN, using the command:
SET VLAN={vlanname|1..4094} PORT={port-list|ALL}
FRAME={UNTAGGED|TAGGED}

Quality of Service

The switch hardware has a number of Quality of Service (QOS) egress queues that can be used to give priority to the transmission of some frames over other frames on the basis of their user priority tagging. The user priority field in an incoming frame (with value 0 to 7) determines which of the eight priority levels the frame is allocated. When a frame is forwarded, it is sent to a QOS egress queue on the port determined by the mapping of priority levels to QOS egress queues. All frames in the first QOS queue are sent before any frames in the second QOS egress queue, and so on, until frames in the last QOS egress queue, which are only sent when there are no frames waiting to be sent in any of the higher QOS egress queues.
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The mapping between user priority and a QOS egress queue can be configured using the command:
SET SWITCH QOS=P0,P1,P2,P3,P4,P5,P6,P7
The switch has four QOS egress queues. It has a default mapping of priority levels to QOS egress queues as defined in IEEE Standard 802.1Q (Table 13).
Table 13: Default priority level to queue mapping for four QOS egress queues
Priority level QOS Egress Queue
01
10
20
31
42
52
63
73
To display the mapping of user priority to QOS egress queues, use the command:
SHOW SWITCH QOS
Figure 3: Example output from the SHOW SWITCH QOS command
Priority Level QOS egress queue
-------------------------------------
0 ................... 1
1 ................... 0
2 ................... 0
3 ................... 1
4 ................... 2
5 ................... 2
6 ................... 3
7 ................... 3
Table 14: Parameters in the output of the SHOW SWITCH QOS command
Parameter Meaning
Priority level The priority level of the frame.
QOS egress queue The Quality Of Service egress queue that frames with this
priority level join.
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Rapier i Series switches include full QoS functionality, including
policies, to provide a QoS configuration for a port or ports
traffic classes, for bandwidth limiting and user prioritisation
maximum bandwidth limiting on a traffic class
flow groups within traffic classes, for user prioritisation
52 Rapier Switch Software Reference
control of the egress scheduling algorithm
priority relabelling of frames, at Layer 2, by replacing the VLAN tag User Priority field
class of service relabelling of frames, at Layer 3, by replacing the DSCP (DiffServ Code Point) or the TOS precedence value in the IP header’s Type of Service (TOS) field
Table 15: The different QoS-type controls available on the switch.
Command set Use for Do not use for
QoS Bandwidth limiting of classified traffic flows.
Priority queueing of classified traffic flows.
Replacing TOS or DSCP byte of IP header.
Replacing User Priority in VLAN tag header.
Providing a coordinated QoS solution for a port or ports, using the QoS policy model.
Configuring a DiffServ domain.
Hardware packet filters Priority queueing of classified traffic flows.
Replacing TOS or DSCP byte of IP header.
Replacing User Priority in VLAN tag header.
Forwarding a flow that is marked to be dropped (for example, because bandwidth allocation is exceeded).
Specifying actions for packets which match the ingress and egress ports of a classifier (if set), but do not match the classifier’s other parameters.
Configuring a simple DiffServ domain.
Layer 3 switch filters Priority queueing of up to 16 distinctly different types
of traffic flow.
Replacing TOS or DSCP byte of IP header.
Replacing User Priority in VLAN tag header.
SET SWITCH PORT Limiting total ingress and/or egress bandwidth on
ports.
Limiting total bandwidth on a port, unless other QoS controls are also required.
Bandwidth limiting.
Configuring most DiffServ domains.
QoS for non-IP traffic (e.g. IPX).
QoS based on VLANs.
Bandwidth limiting.
Limiting bandwidth of particular types of traffic.
Limiting egress bandwidth if priority queueing is also required.

Spanning Tree Protocol (STP)

The Spanning Tree Protocol (STP) makes it possible to automatically disable redundant paths in a network to avoid loops, and enable them when a fault in the network means they are needed to keep traffic flowing. A sequence of LANs and switches may be connected together in an arbitrary physical topology resulting in more than one path between any two switches. If a loop exists, frames transmitted onto the extended LAN would circulate around the loop indefinitely, decreasing the performance of the extended LAN. On the other hand, multiple paths through the extended LAN provide the opportunity for redundancy and backup in the event of a bridge experiencing a fatal error condition.
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The spanning tree algorithm ensures that the extended LAN contains no loops and that all LANs are connected by:
Detecting the presence of loops and automatically computing a logical loop-free portion of the topology, called a spanning tree. The topology is dynamically pruned to a spanning tree by declaring the ports on a switch redundant, and placing the ports into a ‘Blocking’ state.
Automatically recovering from a switch failure that would partition the extended LAN by reconfiguring the spanning tree to use redundant paths, if available.

Spanning Tree Modes

STP can run in STANDARD mode, or RAPID mode. Rapid mode allows for rapid configuration of the spanning tree. The Rapid Spanning Tree Protocol (RSTP) is specified in IEEE 802.1w.
A spanning tree running in standard mode can take up to one minute to rebuild after a topology or configuration change. The Rapid Spanning Tree algorithm provides for a more rapid recovery of connectivity following the failure of a bridge, bridge port, or a LAN.
For information about RSTP see the Rapid Mode Spanning Tree Types section, Switch chapter in the Rapier Switch Software Reference.

Spanning Tree and Rapid Spanning Tree Port States

If STP is running in STANDARD mode, then each port can be in one of five Spanning Tree states, and one of two switch states. If STP is running in RAPID mode, then each port can be in one of four states. The state of a switch port is taken into account by STP. To be involved in STP negotiations, STP must be enabled on the switch, the port must be enabled on the switch, and enabled for the STP it belongs to.
The Spanning Tree states (see Table 16) affect the behaviour of ports whose switch state is enabled.
Table 16: Spanning tree port states .
State Meaning
DISABLED STP operations are disabled on the port. The port can still
switch if its switch state is enabled.
LISTENING The port is enabled for receiving frames only.
LEARNING The port is enabled for receiving frames only, and the
Learning Process can add new source address information to the Forwarding Database.
FORWARDING The normal state for a switch port. The Forwarding Process
and the Spanning Tree entity are enabled for transmit and receive operations on the port.
BLOCKING The Spanning Tree entity has disabled the Forwarding
process for transmit and receive operations on the port, but the Spanning Tree entity itself remains enabled for transmit and receive operations on the port.
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54 Rapier Switch Software Reference
Table 17: Rapid Spanning Tree port states .
State Meaning
DISABLED STP operations are disabled on the port.
DISCARDING The port does not participate in frame relay. The forwarding
process discards received frames and does not submit forwarded frames for transmission.
LEARNING The port is enabled for receiving frames only, and the
Learning Process can add new source address information to the Forwarding Database. The port does not forward any frames.
FORWARDING The normal state for a switch port. The Forwarding Process
and the Spanning Tree entity are enabled for transmit and receive operations on the port.
To specify whether the STP will operate in STANDARD mode or RAPID mode, use the command:
SET STP={stp-name|ALL} [MODE={STANDARD|RAPID}] [other
parameters]
The default is STANDARD. If the mode is changed while the algorithm is running then the STP is re-initialised.
To display the STP state of the switch ports (Figure 3 on page 61), use the command:
SHOW STP[={stp-name|ALL}] PORT={port-list|ALL}
A Rapier switch in default LAN configuration has a default Spanning Tree enabled, spanning only a single default VLAN, to which all ports belong. The switches in the LAN run a distributed Spanning Tree Algorithm to create a single Spanning Tree. In a network of Rapier switches with VLANs configured, all VLANs belong by default to a default Spanning Tree called default. Multiple Spanning Trees can be created with each Spanning Tree encompassing multiple VLANs (in networks switched exclusively by Rapier switches).
For more information about multiple spanning trees, see the Switching chapter in the Rapier Switch Software Reference.

Overlapping VLANs belonging to multiple Spanning Tree instances

The Rapier i Series switches support the situation where a port is contained in more than one Spanning Tree instance when the port is a member of more than one VLAN and those VLANs belong to different STPs (See Figure 1-4 on page 55).
On the Rapier i Series switches only, the number of STPs that can be configured is 255.
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Figure 1-4: Port membership of VLANs which belong to different spanning tree instances (on Rapier i Series switches only).
STP A
VLAN 1
Port 1
Port 2 is a member of multiple Spanning Tree Instances (STP A and STP B) because it is a member of multiple VLANs (VLAN 2 and VLAN 3).
VLAN 2
Port 2
STP B
VLAN 3
Port 3
SWITCH12

Configuring STP

By default, the switch has one default STP which cannot be destroyed. In most situations this default STP will suffice.
By default, all VLANs, and therefore all ports, belong to the default STP. To add or delete a VLAN and all the ports belonging to it from any other STP, use the commands:
ADD STP=stpname VLAN={vlan-name|2..4094}
DELETE STP=stpname VLAN={vlan-name|2..4094|ALL}
The default STP is disabled by default at switch start up, and STPs created by a user are disabled by default when they are created. An STP must be enabled before STP can be enabled or disabled on particular ports belonging to it. To enable or disable STPs, use the commands:
ENABLE STP{=stpname|ALL}
DISABLE STP={stpname|ALL}
The Spanning Tree Protocol uses three configurable parameters for the time intervals that control the flow of STP information on which the dynamic STP topology depends: the HELLOTIME, FORWARDDELAY and MAXAGE parameters. All switches in the same spanning tree topology must use the same values for these parameters, but can themselves be configured with different, and potentially incompatible time intervals. The parameter values actually used by each switch are those sent by the root bridge, and forwarded to all other switches by the designated bridges.
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The FORWARDDELAY parameter sets the time, in seconds, used to control how fast a port changes its spanning state when moving towards the Forwarding state. The value determines how long the port stays in each of the Listening and Learning states which precede the Forwarding state. This value
56 Rapier Switch Software Reference
is only used when the switch is acting as the Root Bridge. Any switch not acting as the Root Bridge uses a dynamic value for the FORWARDDELAY set by the Root Bridge. The FORWARDDELAY, MAXAGE and HELLOTIME parameters are interrelated. See the note and formulae below. The default value for FORWARDDELAY is 15 seconds.
The HELLOTIME parameter sets the time, in seconds, between the transmission of switch spanning tree configuration information when the switch is the Root Bridge of the spanning tree or is trying to become the Root Bridge. The default value is 2 seconds.
The MAXAGE parameter sets the maximum age, in seconds, of Spanning Tree Protocol information learned over the network on any port before it is discarded. The default value is 20 seconds.
The FORWARDDELAY, MAXAGE and HELLOTIME parameters should be set according to the following formulae, as specified in IEEE Standard 802.1D: 2 x (FORWARDDELAY - 1.0 seconds) >= MAXAGE MAXAGE >= 2 x (HELLOTIME + 1.0 seconds)
To modify the parameters controlling these time intervals, use the command:
SET STP={stp-name|ALL} [FORWARDDELAY=4..30] [HELLOTIME=1..10]
[MAXAGE=6..40] [other parameters]
The value of the PRIORITY parameter is used to set the writable portion of the bridge ID, i.e. the first two octets of the (8-octet long) Bridge Identifier. The remaining 6 octets of the bridge ID are given by the MAC address of the switches. The Bridge Identifier parameter is used in all configuration Spanning Tree Protocol packets transmitted by the switch. The first two octets, specified by the PRIORITY parameter, determine the switch’s priority for becoming the root bridge or a designated bridge in the network, with a lower number indicating a higher priority. In fairly simple networks, for instance those with a small number of switches in a meshed topology, it may make little difference which switch is selected to be the root bridge, and no modifications may be needed to the default PRIORITY parameter, which has a default value of 32768. In more complex networks, one or more switches are likely to be more suitable candidates for the root bridge role, for instance by virtue of being more central in the physical topology of the network. In these cases the STP PRIORITY parameters for at least one of the switches should be modified.
To change the STP priority value, use the command:
SET STP={stpname|ALL} PRIORITY=0..65535
The PRIORITY parameter sets the priority of the switch to become the Root Bridge. The lower the value of the Bridge Identifier, the higher the priority. If the PRIORITY parameter is set, either by specifying the PRIORTY or DEFAULT parameters, the specified STP is initialised. Counters for the STP are not affected. The default value for PRIORITY is 32768.
To restore STP timer and priority defaults, use the command:
SET STP={stpname|ALL} DEFAULT
Changing the STP PRIORITY using either of the previous commands initialises the STP, so that elections for the root bridge and designated bridges begin again, without resetting STP counters. To display general information about STPs on the switch, use the command:
SHOW STP[={stpname|ALL}] [SUMMARY]
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Figure 2: Example output from the SHOW STP command.
STP Information
------------------------------------------------------------
Name .................. grey
Mode .................. Rapid
RSTP Type ............. Normal
VLAN members .......... vlan4 (4)
Status ................ ON
Number of Ports ....... 2
Number Enabled ...... 2
Number Disabled ..... 0
Bridge Identifier ..... 32768 : 00-00-cd-05-19-28
Bridge Priority ....... 32768
Root Bridge ........... 32768 : 00-00-cd-05-19-28
Designated Bridge ..... 32768 : 00-00-cd-05-19-28
Root Port ............. (n/a)
Root Path Cost ........ 0
Max Age ............... 20
Hello Time ............ 2
Forward Delay ......... 15
Switch Max Age ........ 20
Switch Hello Time ..... 2
Switch Forward Delay .. 15
Transmission Limit .... 3
Name .................. default
Mode .................. Standard
RSTP Type ............. (n/a)
VLAN members .......... default (1)
vlan5 (5) vlan6 (6) vlan7 (7) vlan8 (8) vlan9 (9) vlan10 (10) vlan11 (11) vlan12 (12) vlan13 (13) vlan14 (14)
Status ................ OFF
Number of Ports ....... 22
Number Enabled ...... 0
Number Disabled ..... 22
Bridge Identifier ..... 32768 : 00-00-cd-05-19-28
Bridge Priority ....... 32768
Designated Root ....... 32768 : 00-00-cd-05-19-28
Root Port ............. (n/a)
Root Path Cost ........ 0
Max Age ............... 20
Hello Time ............ 2
Forward Delay ......... 15
Switch Max Age ........ 20
Switch Hello Time ..... 2
Switch Forward Delay .. 15
Hold Time ............. 1
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Table 18: Parameters in the output of the SHOW STP command .
Parameter Meaning
STP Name The name of the Spanning Tree Protocol entity.
Mode Whether STP is running in standard, or rapid mode.
RSTP Type Whether RSTP is operating normally, or as STP compatible.
In STP compatible mode, the rapid transitions to forwarding do not occur.
VLAN members A list of the VLANs that are members of the STP. VLAN
Identifiers are shown in brackets.
Status The status of the STP; either ON or OFF.
Number of Ports The number of ports belonging to the STP.
Number Enabled The number of ports that have been enabled using the
ENABLE STP command and are being considered by the Spanning Tree Algorithm.
Number Disabled The number of ports that have been disabled using the
DISABLE STP command and are not being considered by the Spanning Tree Algorithm.
Bridge Identifier The unique Bridge Identifier of the switch. This parameter
consists of two parts, one of which is derived from the unique Switch Address, and the other of which is the priority of the switch.
Bridge Priority The settable priority component that permits the relative
priority of bridges to be managed. The range of values is between 0 and 65535. A lower number indicates a higher priority.
Designated Root The unique Bridge Identifier of the bridge assumed to be
the root, (Standard Mode only).
Root Bridge The unique Bridge Identifier of the bridge assumed to be
the Root, (Rapid Mode only).
Designated Bridge The unique Bridge Identifier of the bridge assumed to be
the designated bridge. Displayed when STP is set to RAPID mode, (Rapid Mode only).
Root Port The port number of the root port for the switch. If the
switch is the Root Bridge this parameter is not valid, and (n/a) is shown.
Root Path Cost The cost of the path to the Root from this switch. If the
switch is the Root Bridge this parameter is not valid and is not shown.
Max Age The maximum age of received Configuration Message
information before it is discarded.
Hello Time The time interval between successive transmissions of the
Configuration Message information by a switch which is the Root or which is attempting to become the Root.
Forward Delay In STP Standard mode, the time ports spend in the Listening
state before moving to the Learning state and the Learning state before moving to the Forwarding state. In Rapid mode, the maximum time taken to transition from Discarding to Learning and Learning to Forwarding. In both modes, the value is also used for the ageing timer for the dynamic entries in the Forwarding Database.
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Table 18: Parameters in the output of the SHOW STP command (Continued).
Parameter Meaning
Switch Max Age The value of the Max Age parameter when this switch is the
Root or is attempting to become the Root. This parameter is set by the MAXAGE parameter in the SET STP command.
Switch Hello Time The value of the Hello Time parameter when this switch is
the Root or is attempting to become the Root. This parameter is set by the HELLOTIME parameter in the SET STP command.
Switch Forward Delay The value of the Forward Delay parameter when this switch
is the Root or is attempting to become the Root. This parameter is set by the FORWARDDELAY parameter in the SET STP command.
Hold Time The minimum time in seconds between the transmission of
configuration BPDUs through a given LAN Port. The value of this fixed parameter is 1, as specified in IEEE 802.1d. This parameter applies only to STP running in standard mode.
Transmission Limit In Rapid mode, this indicates the number of BPDUs that
may be transmitted in the interval specified by Hello Time. The value of this fixed parameter is 3, as specified in IEEE
802.1t.
The various parameters used by the Spanning Tree Algorithm for the specified ports, or all ports within the specified STP, or all STPs, are set with the SET STP PORT command:
SET STP={stp-name|ALL} PORT={port-list|ALL}
A port can belong to a single STP, except on the Rapier i series switches. This means that if the port is member of multiple VLANs then all those VLANs must belong to the same STP.
On the Rapier i Series switches only, a port can belong to multiple STPs if the port is a member of more than one VLAN.
The STP parameter specifies an STP name. If no parameter is entered, the default value is ALL.
The PORT parameter specifies a list of ports that can belong to any STP. The default value is ALL.
Each port has a port priority, with a default value of 128, used to determine which port should be the root port for the STP if two ports are connected in a loop. The lower number indicates the higher priority.
SET STP={stp-name|ALL} PORT={port-list|ALL}
PORTPRIORITY=0..255 [other-parameters]
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The PORTPRIORITY parameter sets the value of the priority field contained in the port identifier. The Spanning Tree Algorithm uses the port priority when determining the root port for each switch. The port with the lowest value is considered to have the highest priority. The default value is 128. Each STP has its own independent PORTPRIORITY parameter for each member port.
Each port also has a path cost, which is used if the port is the root port for the STP on the switch. The path cost is added to the root path cost field in
60 Rapier Switch Software Reference
configuration messages received on the port to determine the total cost of the path to the root bridge. The default PATHCOST values depend on the port speed, according to the formula:
PATHCOST = 1000 / Port_Speed_in_MB_per_second
so that a port operating at 10Mbps has a default pathcost of 100, a port operating at 100 Mbps has a default pathcost of 10, and a port operating at 1 Gbps has a default pathcost of 1. Setting the pathcost to a larger value on a particular port is likely to reduce the traffic over the LAN connected to it. This may be appropriate if the LAN has lower bandwidth, or if there are reasons for limiting the traffic across it. To modify the STP port pathcost, use the command:
SET STP={stp-name|ALL} PORT={port-list|ALL}
PATHCOST=1..1000000
If the PATHCOST of a port has not been explicitly set by the user, or the default values have been restored to the port, then the default PATHCOST for the port will vary as the speed of the port varies.
The default value for PATHCOST is set according to the speed. For a port operating at 100 Mbps, the default value is 19. For a port operating at 10 Mbps, the default value is 100.
To restore default port pathcost and priority, use the command:
SET STP={stp-name|ALL} PORT={port-list|ALL} DEFAULT
When an STP is enabled in a looped or meshed network, it disables and enables particular ports belonging to it dynamically, to eliminate redundant links. All ports in a VLAN belong to the same STP, and their participation in STP configuration, and hence the possibility of them being elected to the STP’s active topology is enabled by default. To enable or disable particular ports, use the commands:
ENABLE STP PORT={port-list|ALL}
DISABLE STP PORT={port-list|ALL}
To display STP port information, use the command:
SHOW STP[={stp-name|ALL}] PORT={port-list|ALL}
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Figure 3: Example output from the SHOW STP PORT command.
STP Port Information
------------------------------------------------------------
STP ..................... grey
STP Status ............ ON
Port .................. 3
RSTP Port Role ...... Disabled
State ............... Discarding
Point To Point ...... No (Auto)
Port Priority ....... 128
Port Identifier ..... 8003
Pathcost ............ 200000
Designated Root ..... 32768 : 00-00-cd-05-19-28
Designated Cost ..... 0
Designated Bridge ... 32768 : 00-00-cd-05-19-28
Designated Port ..... 8003
EdgePort ............ No
VLAN membership ..... 1
Port .................. 4
RSTP Port Role ...... Disabled
State ............... Discarding
Point To Point ...... No (Auto)
Port Priority ....... 128
Port Identifier ..... 8004
Pathcost ............ 200000
Designated Root ..... 32768 : 00-00-cd-05-19-28
Designated Cost ..... 0
Designated Bridge ... 32768 : 00-00-cd-05-19-28
Designated Port ..... 8004
EdgePort ............ No
STP ..................... default
STP Status ............ OFF
Port .................. 1
State ............... Disabled
Port Priority ....... 128
Port Identifier ..... 8001
Pathcost ............ 19
Designated Root ..... 32768 : 00-00-cd-05-19-28
Designated Cost ..... 0
Designated Bridge ... 32768 : 00-00-cd-05-19-28
Designated Port ..... 8001
Table 19: Parameters displayed in the output of the SHOW STP PORT command .
Parameter Meaning
STP The name of the STP that the port is a member of.
STP Status Whether this STP is enabled or disabled; one of ON or OFF.
Port The number of the port.
RSTP Port Role The role of the port; one of Disabled, Alternate, Backup,
Designated, or Root. (Rapid Mode only).
State The state of the port; one of “Disabled”, “Blocking”,
“Listening”, “Learning” or “Forwarding” for Standard mode, and one of; “Disabled”, “Discarding”, “Learning”, or “Forwarding” for Rapid mode.
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Table 19: Parameters displayed in the output of the SHOW STP PORT command
Parameter Meaning
Point To Point Whether the port has a point to point connection with
another bridge; one of NO or YES. (Rapid Mode only).
Port Priority The priority of the port. Used as part of the Port Identifier
field. In Standard mode it forms the upper 8 bits of the Port Identifier field. In Rapid mode it forms the upper 4 bits of the Port Identifier field.
Port Identifier The unique identifier of the port. This parameter is used to
determine the root port or designated port of the switch.
Pathcost The path cost of the port.
Designated Root The unique Bridge Identifier of the Root Bridge, as recorded
in the configuration BPDU.
Designated Cost The Designated Cost for the port.
Designated Bridge Either the unique Bridge Identifier of the switch, or the
unique Bridge Identifier of the switch believed to be the Designated Bridge for the LAN to which the port is attached.
Designated Port The Port Identifier of the port on the Designated Bridge
through which the Designated Bridge transmits Configuration BPDU information stored by this port.
Edge Port An edge port is a port that attaches to a LAN that is known
to have no other bridges attached; one of YES, or NO.
VLAN membership The number of VLANs the port is a member of within this
STP instance.
The spanning tree algorithm can be recalculated at any time, and all timers and counters be initialised, using the command:
RESET STP={stpname|ALL}
To show STP counters, use the command:
SHOW STP[={stpname|ALL}] COUNTER
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Figure 4: Example output from the SHOW STP COUNTER command
STP Counters
-----------------------------------------------------------­STP Name: default Receive: Transmit: Total STP Packets 0 Total STP Packets 1677 Configuration BPDU 0 Configuration BPDU 0 TCN BPDU 0 TCN BPDU 0 RST BPDU 0 RSTP BPDU 1677 Invalid BPDU 0
Discarded: Port Disabled 0 Invalid Protocol 0 Invalid Type 0 Invalid Message Age 0 Config BPDU length 0 TCN BPDU length 0 RST BPDU length 0
------------------------------------------------------------
Table 20: Parameters in the output of the SHOW STP COUNTER command .
Parameter Meaning
STP Name The name of the STP.
Receive
STP packets received.
Total STP Packets The total number of STP packets received. Valid STP
packets comprise Configuration BPDUs and Topology Change Notification (TCN) BPDUs.
Configuration BPDU The number of valid Configuration BPDUs received.
TCN BPDU The number of valid Topology Change Notification BPDUs
received.
RST BPDU The number of valid Rapid Spanning Tree BPDUs received
(RAPID mode only).
Invalid BPDU The number of invalid STP packets received.
Transmit
STP packets transmitted.
Total STP packets The total number of STP packets transmitted.
Configuration BPDU The number of Configuration BPDUs transmitted.
TCN BPDU The number of Topology Change Notification BPDUs
transmitted.
RST BPDU The number of valid Rapid Spanning Tree BPDUs
transmitted (RAPID mode only).
Discarded
STP packets discarded.
Port Disabled The number of BPDUs discarded because the port that the
BPDU was received on was disabled.
Invalid Protocol The number of STP packets that had an invalid Protocol
Identifier field or invalid Protocol Version Identifier field.
Invalid Type The number of STP packets that had an invalid Type field.
Invalid Message Age The number of STP packets that had an invalid message
age.
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64 Rapier Switch Software Reference
Table 20: Parameters in the output of the SHOW STP COUNTER command
Parameter Meaning
Config BPDU length The number of Configuration BPDUs that had an incorrect
length.
TCN BPDU length The number of Topology Change Notification BPDUs that
had an incorrect length.
RST BPDU length The number of Rapid Spanning Tree BPDUs that had an
incorrect length (RAPID mode only).
If necessary, all the STP configuration that users have created on the switch can be removed, so that all STPs except the default STP are destroyed, and all other defaults are restored, using the command:
PURGE STP
The PURGE STP command should be used with caution, and generally only before major reconfiguration of the switch, as it removes all STP configuration entered on the switch.

Interfaces to Layer 3 Protocols

Interfaces can be configured to VLANs for IP, IPX and Appletalk routing protocols in the same way that other interfaces are created for other interface types. Concatenate VLAN with the VID of the VLAN giving VLANn, for instance:
INTERFACE=VLAN3

IGMP Snooping

IGMP (Internet Group Management Protocol) is used by IP hosts to report their multicast group memberships to routers and switches. IP hosts join a multicast group to receive broadcast messages directed to the multicast group address. IGMP is an IP-based protocol and uses IP addresses to identify both the multicast groups and the host members. For a VLAN-aware devices, this means multicast group membership is on a per-VLAN basis. If at least one port in the VLAN is a member of a multicast group, by default multicast packets will be flooded onto all ports in the VLAN.
IGMP snooping enables the switch to forward multicast traffic intelligently on the switch. The switch listens to IGMP membership reports, queries and leave messages to identify the switch ports that are members of multicast groups. Multicast traffic will only be forwarded to ports identified as members of the specific multicast group.
IGMP snooping is performed at Layer 2 on VLAN interfaces automatically. By default, the switch will only forward traffic out those ports with multicast listeners, therefore it will not act as a simple hub and flood all multicast traffic out all ports. IGMP snooping is independent of the IGMP and Layer 3
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Layer 2 Switching 65
configuration, so an IP interface does not have to be attached to the VLAN, and IGMP does not have to be enabled or configured.
IGMP snooping is enabled by default. To disable it, use the command:
DISABLE IGMPSNOOPING
Disabling IGMP snooping may be useful if filters are used extensively, because IGMP snooping uses a Layer 3 filter. When IGMP snooping is disabled, this filter becomes available. See “Hardware Packet Filtersin Chapter 2, Switching
in
the Rapier Switch Software Reference for information about filters. Note that
multicast packets will flood the VLAN when IGMP snooping is disabled.
IGMP is used in conjunction with limited static multicast settings, or with DVMRP or PIM Sparse Mode for full multicast support (IP Multicasting chapter in the Rapier Switch Software Reference).
IGMP is enabled and disabled using the commands:
ENABLE IP IGMP
DISABLE IP IGMP
IGMP snooping is then enabled or disabled on a VLAN using the commands:
ENABLE IP IGMP INTERFACE=interface [DLC=1..1024]
DISABLE IP IGMP INTERFACE=interface [DLC=1..1024]
The switch will snoop IGMP packets transiting the VLAN and only forward multicast packets to the ports which have seen a membership report from network devices connected to those ports, instead of being forwarded to all ports belonging to the VLAN.
The command:
SET IP IGMP TIMEOUT=1..65535 QUERYINTERVAL=1..65535
sets operational parameters for IGMP. The QUERYINTERVAL parameter specifies the time interval, in seconds, at which IGMP Host Membership Queries are sent if this switch is elected the designated router for the LAN. The default is 125.
The TIMEOUT parameter specifies the longest interval, in seconds, that a group will remain in the local group database without receiving a Host Membership Report. The default is 270. If a value is specified for QUERYINTERVAL without specifying a value for TIMEOUT, TIMEOUT is calculated as 2*(QUERYINTERVAL + 10). The 10 seconds is the variation that hosts use when sending Host Membership Reports. If a timeout interval is specified, it will override any calculated value.
The command:
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SHOW IP IGMP [COUNTER] [INTERFACE=interface]
displays information about IGMP, IGMP snooping, and multicast group membership for each VLAN-based IP interface (Figure 5 on page 66, Table 21 on page 66).
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Figure 5: Example output from the SHOW IP IGMP command.
IGMP Protocol
----------------------------------------------------------------------------------
Status ........................... Enabled
Default Query Interval ........... 125 secs
Default Timeout Interval ......... 270 secs
Last Member Query Interval ....... 10 (1/10secs)
Last Member Query Count .......... 2
Robustness Variable .............. 2
Query Response Interval .......... 100 (1/10secs)
Interface Name .......... vlan1 (DR)
Other Querier timeout ... 164 secs
IGMP Proxy .............. Upstream
Group List ..............
Group. 224.0.1.22 Last Adv. 10.194.254.254 Refresh time 184 secs Ports 24
All Groups Last Adv. 10.116.2.1 Refresh time 254 secs Ports 24
Table 21: Parameters in the output of the SHOW IP IGMP command .
Parameter Meaning
Status The status of IGMP; one of “Enabled” or “Disabled”.
Default Query Interval The default interval at which Host Membership Queries are
sent.
Default Timeout Interval The default interval after which entries will be removed
from the group database, if no Host Membership Report is received.
Last Member Query Interval Max Response Time inserted into Group-Specific Queries
sent in response to Leave Group messages, and is also the amount of time between Group-Specific Query messages.
Last Member Query Count The number of Group-Specific Queries sent before the
switch assumes there are no local members.
Robustness Variable IGMP is robust to (Robustness Variable-1) packet losses.
Query Response Interval The Max Response Time (in 1/10 secs) inserted into the
periodic General Queries.
Interface Name The name of an interface configured for IGMP.
Other Querier timeout The length of time that remains before a multicast router
decides that there is no longer another multicast router which should be the querier.
IGMP Proxy The status of IGMP Proxy; one of “Off”, “Upstream” or
“Downstream”.
Group List
A list of multicast group memberships for this interface.
Group The group multicast address.
Last Adv. The last host to advertise the membership report.
Refresh time The time interval (in seconds) until the membership group
will be deleted if it does not receive another membership report before then.
Ports The list of ports listening to this group.
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Layer 2 Switching 67

Triggers

The Trigger Facility can be used to automatically run specified command scripts when particular triggers are activated. When a trigger is activated by an event, global parameters and parameters specific to the event are passed to the script that is run. For a full description of the Trigger Facility, see the Trigger Facility chapter in the Rapier Switch Software Reference.
The switch can generate triggers to activate scripts when a fibre uplink port loses or gains coherent light. To create or modify a switch trigger, use the commands:
CREATE TRIGGER=trigger-id MODULE=SWITCH
EVENT={LIGHTOFF|LIGHTON} PORT=port [AFTER=hh:mm] [BEFORE=hh:mm] [DATE=date|DAYS=day-list] [NAME=name] [REPEAT={YES|NO|ONCE|FOREVER|count}] [SCRIPT=filename...] [STATE={ENABLED|DISABLED}] [TEST={YES|NO|ON|OFF}]
SET TRIGGER=trigger-id PORTS={port-list|ALL} [AFTER=hh:mm]
[BEFORE=hh:mm] [DATE=date|DAYS=day-list] [NAME=name] [REPEAT={YES|NO|ONCE|FOREVER|count}] [TEST={YES|NO|ON|OFF}]
The following sections list the events that may be specified for the EVENT parameter, the parameters that may be specified as module-specific-parameters, and the arguments passed to the script activated by the trigger.
Event LINKDOWN Description The port link specified by the PORT parameter has just gone down. Parameters The following command parameter(s) must be specified in the CREATE/SET
TRIGGER commands:
Parameter Description
PORT=port The port on which the event will activate the trigger.
Script Parameters The trigger passes the following parameter(s) to the script:
Argument Description
%1 The port number of the port which has just gone down.
Event LINKUP Description The port link specified by the PORT parameter has just come up. Parameters The following command parameter(s) must be specified in the CREATE/SET
TRIGGER commands:
Parameter Description
PORT=port The port on which the event will activate the trigger.
Script Parameters The trigger passes the following parameter(s) to the script:
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Argument Description
%1 The port number of the port which has just come up.
Layer 3 Switching 69
Chapter 5

Layer 3 Switching

The Rapier switch provides Layer 3 switching and routing over VLANs. Once a VLAN has been created (see “Virtual Local Area Networks (VLANs)” on page 38), the VLAN name can be used wherever a logical interface is required in commands for configuring routing protocols.
VLAN names are of the form:
VLAN-vlanname
or
VLANn
where vlanname is the manager-assigned name of the VLAN, and n is the VLAN identifier (VID).
For example, if a VLAN is created using the command:
CREATE VLAN=admin VID=11
then the following names can be used to identify the VLAN in routing commands:
vlan-admin
vlan11
The following sections illustrate the use of VLANs for IP, RIP, IPX, AppleTalk and RSVP. For a complete description of all the protocols supported by the switch, see the Rapier Switch Software Reference.

Internet Protocol (IP)

The switch performs IP routing at wire speed between VLANs. To add the admin VLAN as an IP interface, firstly enable IP using the command:
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ENABLE IP
Then use either of the following commands:
ADD IP INTERFACE=vlan-admin
ADD IP INTERFACE=vlan11
The command:
SHOW IP INTERFACE
displays the interfaces enabled for IP routing (Figure 6 on page 70).
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Figure 6: Example output from the SHOW IP INTERFACE command.
Interface Type IP Address Bc Fr PArp Filt RIP Met. SAMode IPSc Pri. Filt Pol.Filt Network Mask MTU VJC GRE OSPF Met. DBcast Mul.
-------------------------------------------------------------------------------­LOCAL - Not Set - n - --- - - --
--- ---- - - - --- - - --­vlan11 Static 192.168.163.39 1 y On --- 01 Pass --
--- --- 255.255.255.0 1500 - --- 0000000001 No On ppp1 Dynamic 0.0.0.0 1 y - --- 01 Pass --
--- --- 255.255.255.255 1500 Off --- 0000000001 No On
--------------------------------------------------------------------------------

IP Multicasting

Static multicast forwarding can be configured using the ADD IP INTERFACE or SET IP INTERFACE commands. Full multicast functionality requires IGMP and DVMRP or PIM-Sparse Mode.
DVMRP, PIM Sparse Mode, and PIM Dense Mode are enabled with a special feature license. To obtain a special feature license contact an Allied Telesyn authorised distributor or reseller.
The switch supports IP multicast routing protocols DVMRP (Distance Vector Multicast Routing Protocol) and PIM Sparse Mode (Protocol Independent Multicast – Sparse Mode. Management of group members is performed using IGMP (Internet Group Management Protocol). IGMP snooping reduces unnecessary multicast traffic between members of the same VLAN. See the IP Multicasting chapter in the Rapier Switch Software Reference.

Routing Information Protocol (RIP)

Routing protocols such as RIPv1 and RIPv2 can be enabled on a VLAN. For example, the command:
ADD IP RIP INTERFACE=vlan11 SEND=RIP2 RECEIVE=BOTH
enables RIPv2 on the admin VLAN. The command:
SHOW IP RIP
displays information about RIP (Figure 7 on page 70).
Figure 7: Example output from the SHOW IP RIP command.
Interface Circuit/DLCI IP Address Send Receive Demand Auth Password
------------------------------------------------------------------------------­vlan11 - - RIP2 BOTH NO NO ppp0 - 172.16.249.34 RIP1 RIP2 YES PASS ********
-------------------------------------------------------------------------------
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Layer 3 Switching 71

Novell IPX

IPX is enabled with a special feature license. To obtain a special feature license contact an Allied Telesyn authorised distributor or reseller.
The switch’s implementation of the Novell IPX protocol uses the term circuit to refer to a logical connection over an interface, similar to an X.25 permanent virtual circuit (PVC) or a Frame Relay Data Link Connection (DLC). The term interface is used to refer to the underlying physical interface, such as VLAN, Ethernet, Point-to-Point (PPP) and Frame Relay.
To create IPX circuit 1 with the Novell network number 129 over the admin VLAN, use the command:
ADD IPX CIRC=1 INTERFACE=vlan11 NETWORK=129 ENCAP=802.3
The command:
SHOW IPX CIRCUIT
displays information about the circuits configured for IPX (Figure 8).
Figure 8: Example output from the SHOW IPX CIRCUIT command.
IPX CIRCUIT information
Name ......................... Circuit 1
Status ....................... enabled
Interface .................... vlan11 (802.3)
Network number ............... c0e7230f
Station number ............... 0000cd000d26
Link state ................... up
Cost in Novell ticks ......... 1
Type20 packets allowed ....... no
On demand .................... no
Spoofing information
Keep alive spoofing .......... no
SPX watch dog spoofing ....... no
On SPX connection failure .... UPLINK
On end of SPX spoofing ....... UPLINK
RIP broadcast information
Change broadcasts ............ yes
General broadcasts ........... yes
General broadcast interval ... 60 seconds
Maximum age .................. 180 seconds
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SAP broadcast information
Change broadcasts ............ yes
General broadcasts ........... yes
General broadcast interval ... 60 seconds
Maximum age .................. 180 seconds
Filter information
Filters ...................... none
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AppleTalk

AppleTalk is enabled with a special feature license. To obtain a special feature license contact an Allied Telesyn authorised distributor or reseller.
To create an AppleTalk port (interface) associated with the admin VLAN, use the command:
ADD APPLE PORT INTERFACE=
vlan11
The command:
APPLE PORT
SHOW
displays information about the ports configured for AppleTalk (Figure 9 on page 72).
Figure 9: Example output from the SHOW APPLE PORT command.
Appletalk Port Details
------------------------------------
Port Number .............. 1
Interface ................ vlan11
ifIndex .................. 1
Node ID .................. 217
Network Number ........... 22
Network Range Start ...... 22
Network Range End ........ 22
State .................... ACTIVE
Seed ..................... NO
Seed Network Start ....... 0
Seed Network End ......... 0
Hint ..................... YES
Hint Node ID ............. 179
Hint Network ............. 22
Default Zone ............. -
Zone List is Empty
------------------------------------

Resource Reservation Protocol (RSVP)

RSVP is enabled with a special feature license. To obtain a special feature license contact an Allied Telesyn authorised distributor or reseller.
The Resource Reservation Protocol (RSVP) enables the receiver of a traffic flow to make the resource reservations necessary to ensure that the receiver obtains the desired QoS for the traffic flow.
RSVP is disabled by default. To enable RSVP, use the command:
ENABLE RSVP
Each IP interface that is to receive and process RSVP messages and accept reservation requests must be enabled. To enable RSVP on the admin VLAN, use the command:
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Layer 3 Switching 73
ENABLE RSVP INTERFACE=vlan11
The command:
SHOW RSVP INTERFACE
displays information about the interfaces enabled for RSVP (Figure 10).
Figure 10: Example output from the SHOW RSVP INTERFACE command.
RSVP Interfaces Maximum Reserved No. Of Interface Enabled Bandwidth(%) Bandwidth(%) Reservations Debug Encap
-----------------------------------------------------------------------------­Dynamic No 75 0 0 None RAW vlan11 Yes 75 0 1 None RAW ppp0 Yes 75 0 0 None RAW
------------------------------------------------------------------------------
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