IMPORTANT!
READ CAREFULLY BEFORE USE.
KEEP THIS GUIDE FOR FUTURE REFERENCE.
Screenshots and graphics in this book may differ slightly from your product due to differences in
your product firmware or your computer operating system. Every effort has been made to ensure
that the information in this manual is accurate.
‘Switch’ (title-case) refers to this product. Lower case ‘switch’ refers to switches in general.
Related Documentation
• Module Hardware Installation Guide
This guide shows how to install and remove the power and fan modules in the Switch.
• Rack Mounting Hardware Installation Guide
This guide shows how to use the rack mounting kit to install the
• CLI Reference Guide
This guide explains how to use the Command-Line Interface (CLI) to configure the Switch.
Note: It is recommended you use the Web Configurator to configure the Switch.
Switch in a rack.
• Web Configurator Online Help
Click the help icon in any screen for help in configuring that screen and supplementary
Access Control ......................................................................................................................................276
MAC Table .............................................................................................................................................306
ARP Ta ble .................................... ... ... .... ... ....................................... ... ... ... ... .... ... ... ... ............................309
6.6 IP Setup .........................................................................................................................................76
6.7 Port Setup ........................................................................................................................................78
Appendix A Common Services........................................................................................................317
Appendix B Legal Information..........................................................................................................321
Index ..................................................................................................................................................323
14
XS3900-48F User’s Guide
PART I
User’s Guide
15
16
This chapter introduces the main features and applications of the Switch.
1.1 Introduction
This is a high-speed, layer-2, enhanced Ethernet switch with FCoE (Fiber Channel over Ethernet)
and DCB (Data Center Bridging) features.
The Switch comes with:
• Forty-eight 10GbE SFP+ ports and four 40GbE QSFP+ ports at the front
• T wo power slots for power modules and two slots for fan modules at the back. The power and fan
modules are hot-swappable and you can choose between front-to-rear and rear-to-front airflow
depending on your installation.
CHAPTER 1
Getting to Know Your Switch
Other key features include SNMP, STP, VLAN, QinQ, Trunk, QoS, and Access Control.
With its built-in web configurator, managing and configuring the Switch is easy. In addition, the
Switch can also be managed via Telnet, any terminal emulator program on the console port, or
third-party SNMP management.
See the datasheet for a full list of software features available on this Switch.
1.2 Data Center Bridging (DCB)
A traditional Ethernet network is best-effort, that is, frames may be dropped due to device queue
overflow or network congestion. FCoE (Fiber Channel over Ethernet) transparently encapsulates
fiber channel traffic into Ethernet, so that you don’t need separate fiber channel and Ethernet
switches.
Data Center Bridging (DCB) enhances Ethernet technology to adapt to the FCoE. It supports
lossless Ethernet traffic (no frames discarded when there is network congestion) and can allocate
bandwidth for different traffic classes, based on IEEE802.1p priority with a guaranteed minimum
bandwidth. LAN traffic (large number of flows and not latency-sensitive), SAN traffic (Storage Area
Network, large packet sizes and requires lossless performance), and IPC traffic (Inter-Process
Communication, latency-sensitive messages) can share the same physical connection while still
having its own priority and guaranteed minimum bandwidth.
The following figure shows an example deployment for the Switch using DCB.
XS3900-48F User’s Guide17
Chapter 1 Getting to Know Your Switch
The following table explains the acronyms in the grap hi c.
Table 1 DCB Graphic Key
LABELDESCRIPTION
EESEnhanced Ethernet Switch
LLANLegacy Local Area Network (Ethernet)
ELANEnhanced LAN (Ethernet & FCoE)
FCFFiber Channel Forwarder
SANStorage Access Network
1.2.1 PFC, ETS, and DCBX Standards
DCB may use PFC, ETS, application priority and DCBX to adapt to the FCoE.
18
XS3900-48F User’s Guide
• PFC (Priority-based Flow Control, IEEE 802.1Qbb -2011) is a flow control mechanism that uses a
PAUSE frame to suspend traffic of a certain priority rather than drop it when there is network
congestion (lossless). If an outgoing (egress) port buffer is almost full, the Switch transmits a
PAUSE frame to the sender who just transmitted traffic requesting it to stop sending traffic of a
certain priority to that port. For example, say outgoing port 8 is receiving too much traffic of
priorities 3-6 from port 1. Then if port 1 is configured with PFC priorities 3-6, port 1 can request
the sender to suspend traffic with priorities 3-6.
Similarly , if the outcoming (egress) port 8 receives a P AUSE frame with PFC priorities 0-1, then if
port 8 is configured with PFC, it can suspend sending traffic with PFC priorities 0-1.
• ETS (Enhanced Transmission Selection, IEEE 802.1Qaz -2011) is used to allocate bandwidth for
different traffic classes, based on IEEE802.1p priority (0 to 7, allowing for eight types of traffic)
with a guaranteed minimum bandwidth.
• Application priority is used to globally assign a priority to all FCoE traffic on the Switch.
• DCBX (Data Center Bridging capability eXchange, IEEE 802.1Qaz -2011) uses LLDP (Link Layer
Discovery Protocol) to advertize PFC, ETS and application priority information between switches.
PFC information should be consistent between connected switches, so PFC can be configured
automatically using DCBX.
1.2.2 DCB Configuration
You should configure DCB on any port that has both Ethernet and FCoE traffic.
Chapter 1 Getting to Know Your Switch
1.2.2.1 DCB Only
Do the following if you’re just using DCB, that is, switches don’t need to know DCB-related
configurations via DCBX.
ETS
• Configure ETS to define traffic classes based on priority. Assign a weighted guaranteed
bandwidth for non strict priority (SP) traffic. SP traffic always has first priority.
First, define traffic classes. This is an example where the non-editable default traffic class, ID 0,
uses SP queuing. LAN and SAN traffic uses WFQ queuing with equal weighting of 50 each.
Table 2 Defined Traffic Classes
TRAFFIC CLASS IDGUARANTEED BANDWIDTHCLASS NAME
0SPDefault
150SAN
250LAN
Next, define relative weights for non-SP traffic. In the example, the guaranteed minimum
bandwidth for both SAN and LAN traffic is 2.5Gbp with a physical link bandwidth of 10Gbps.
• Estimate what traffic types are likely to cause network congestion and configure PFC with these
associated priorities. For example, if SAN traffic is likely to cause congestion, then configure PFC
with priorities 3, 4, 5, 6. It’s better if the connected peer switch has the same configured
priorities.
1.2.2.2 DCB with DCBX
Do the following if you’re using DCB with DCBX, that is, switches need to know each other’s PFC,
ETS and application priority information.
• Enable transmission and reception of LLDP PDUs (Protocol Data Unit) on a port using lldp admin-status tx-rx.
• Enable TLV (Type-Length-Value) transmission of formats so that switches can read each others
ETS, PFC and application priority information sent via LLDP PDUs.
• Configure ETS as outlined in the previous section.
• Configure application priority for all FCoE traffic on the Switch.
20
XS3900-48F User’s Guide
Chapter 1 Getting to Know Your Switch
Backbone
RD
Sales
• Set PFC to auto (Willing = True) if you want the Switch to accept PFC priority configuration from
another switch. In the following example, switch A sends its LLDP PDU with PFC TLV, local
priorities 3, 4, 5 and auto (Willing field is set to true, meaning it is willing to accept PFC priorities
from the peer). Switch B’s local priorities are 0 and 1 and Willing field is set to false, meaning it is
not willing to accept PFC priorities from the peer, switch A). Switch A will use switch B’s
configured priorities 0 and 1.
Switch A LLDP PDUSwitch B LLDP PDU
PFC TLV3,4,5Willing = True
PFC TLV0,1Willing = False
PFC TLV0,1Willing = True
If both switches are configured to accept configuration (auto on both switches), then the
configuration of the switch with the lowest MAC address hex value sum is used.
• Verify configurations by displaying all port and Switch (local and peer) LLDP information. Local
port and Switch configuration and statistics can also be viewed.
Note: At the time of writing, DCB is configured using the Command Line Interface (CLI)
only. See the CLI reference guide for details and usage examples.
1.3 Bridging Example
In this example the Switch connects different company departments (RD and Sales) to the
corporate backbone. It can alleviate bandwidth contention and eliminate server and network
bottlenecks. All users that need high bandwidth can connect to high-speed department servers via
the Switch. You can provide a super-fast uplink connection by using the optional 10 Gigabit uplink
module on the Switch.
Figure 1 Bridging Application
XS3900-48F User’s Guide
21
Chapter 1 Getting to Know Your Switch
HQ
Branch
10 Gbps
Trunk
1.4 High Performance Switching Example
The Switch is ideal for connecting two geographically dispersed networks that need high bandwidth.
In the following example, a company uses the optional 10 Gigabit uplink modules to connect the
headquarters to a branch office network. Within the headquarters network, a company can use
trunking to group several physical ports into one logical higher-capacity link. Trunking can be used
if for example, it is cheaper to use multiple lower-speed links than to under-utilize a high-speed,
but more costly, single-port link.
Figure 2 High Performance Switching
1.5 IEEE 802.1Q VLAN Application Example
A VLAN (Virtual Local Area Network) allows a physical network to be partitioned into multiple logical
networks. Stations on a logical network belong to one or more groups. With VLAN, a station cannot
directly talk to or hear from stations that are not in the same group(s) unless such traffic first goes
through a router.
For more information on VLANs, refer to Chapter 7 on page 81.
1.5.0.1 Tag-based VLAN Example
Ports in the same VLAN group share the same frame broadcast domain, thus increasing network
performance by reducing broadcast traffic. VLAN groups can be modified at any time by adding,
moving or changing ports without any re-cabling.
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XS3900-48F User’s Guide
Chapter 1 Getting to Know Your Switch
Shared resources such as a server can be used by all ports in the same VLAN as the server. In the
following figure only ports that need access to the server need to be part of VLAN 1. Ports can
belong to other VLAN groups too.
Figure 3 Shared Server Using VLAN Example
1.6 IPv6 Support
IPv6 (Internet Protocol version 6), is designed to enhance IP address size and features. The
increase in IPv6 address size to 128 bits (from the 32-bit IPv4 address) allows up to 3.4 x 10
addresses. At the time of writing, the Switch supports the following features.
• Static address assignment and stateless auto-configuration
• Neighbor Discovery Protocol (a protocol used to discover other IPv6 devices in a network)
• Remote Management using ping SNMP, telnet, HTTP and FTP services
• ICMPv6 to report errors encountered in packet processing and perform diagnostic functions, such
as "ping”
• IPv4/IPv6 dual stack; the Switch can run IPv4 and IPv6 at the same time
• DHCPv6 client and relay
• Multicast Listener Discovery (MLD) snooping and proxy
• For more information on IPv6, refer to the CLI Reference Guide.
1.7 Ways to Manage the Switch
Use any of the following methods to manage the Switch.
38
IP
• Web Configurator. This is recommended for everyday management of the Switch using a
(supported) web browser. See Chapter 4 on page 53.
• Command Line Interface. Line commands offer an alternative to the Web Configurator and may
be necessary to configure advanced features. See the CLI Reference Guide.
• FTP. Use File Transfer Protocol for firmware upgrades and configuration backup/restore. See
Section 35.8 on page 273.
XS3900-48F User’s Guide
23
Chapter 1 Getting to Know Your Switch
• SNMP. The device can be monitored and/or managed by an SNMP manager. See Section 36.3 on
page 276.
1.8 Good Habits for Managing the Switch
Do the following things regularly to make the Switch more secure and to manage the Switch more
effectively.
• Change the password. Use a password that’s not easy to guess and that consists of different
types of characters, such as numbers and letters.
• Write down the password and put it in a safe place.
• Back up the configuration (and make sure you know how to restore it). Restoring an earlier
working configuration may be useful if the device becomes unstable or even crashes. If you
forget your password, you will have to reset the Switch to its factory default settings. If you
backed up an earlier configuration file, you would not have to totally re-configure the Sw itch. Y ou
could simply restore your last configuration.
24
XS3900-48F User’s Guide
CHAPTER 2
VLAN 100
A
B
M
C
Tutorials
This chapter provides some examples of using the web configurator to set up and use the Switch.
The tutorials include:
• How to Use DHCP Snooping on the Switch
• How to Use DHCP Relay on the Switch
• How to Use PPPoE IA on the Switch
• How to Use Error Disable and Recovery on the Switch
• Creating a VLAN
• Setting Port VID
• How to Set Up a Guest VLAN
2.1 How to Use DHCP Snooping on the Switch
You only w ant DHCP server A connected to port 5 to assign IP addresses to all devices in VLAN 100.
Create a VLAN containing ports 5, 6 and 7. Connect a computer M to the Switch’s MGMT port.
Note: For related information about DHCP snoopi ng, see Section 24.1 on page 200.
The settings in this tutorial are as the following.
Table 5 Settings in this Tutorial
HOST
DHCP Server (A)51 and 100100Yes
DHCP Client (B)61 and 100100No
DHCP Client (C)71 and 100100No
PORT
CONNECTED
VLANPVIDDHCP SNOOPING PORT TRUSTED
XS3900-48F User’s Guide25
Chapter 2 Tutorials
1Access the Switch from the MGMT port through http://192.168.0.1 by default. Log into the
Switch by entering the username (default: admin) and password (default: 1234).
2Go to Advanced Application > VLAN > Static VLAN, and create a VLAN with ID of 100. Add
ports 5, 6 and 7 in the VLAN by selecting Fixed in the Control field as shown.
Deselect Tx Tagging because you don’t want outgoing traffic to contain this VLAN tag.
Click Add.
3Go to Advanced Application > VLAN > VLAN Port Setting, and set the PVID of the ports 5, 6
and 7 to 100. This tags untagged incoming frames on ports 5, 6 and 7 with the tag 100.
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XS3900-48F User’s Guide
Chapter 2 Tutorials
4Go to Advanced Application > IP Source Guard > DHCP snooping > Configure, activate and
specify VLAN 100 as the DHCP VLAN as shown. Click Apply.
5Click the Port link at the top right corner.
6The DHCP Snooping Port Configure screen appears.
Select Trusted in the Server Trusted state field for port 5 because the DHCP server is connected
to port 5. Keep ports 6 and 7 Untrusted because they are connected to DHCP clients. Click Apply.
XS3900-48F User’s Guide
27
Chapter 2 Tutorials
7Go to Advanced Application > IP Source Guard > DHCP snooping > Configure > VLAN,
show VLAN 100 by entering 100 in the Start VID and End VID fields and click Apply. Then select Yes in the Enabled field of the VLAN 100 entry shown at the bottom section of the screen.
If you want to add more information in the DHCP request packets such as source VLAN ID or
system name, you can also select the Option82 and Information fields in the entry. See Section
24.1.2.3 on page 202.
8Click Save at the top right corner of the web configurator to save
the configuration permanently.
9Connect your DHCP server to port 5 and a computer (as DHCP client) to either port 6 or 7. The
computer should be able to get an IP address from the DHCP server. If you put the DHCP server on
port 6 or 7, the computer will not able to get an IP address.
10 To check if DHCP snooping works, go to Advanced Application > IP Source Guard, you should
see an IP assignment with the type dhcp-snooping as shown.
You can also telnet or log into the Switch’s console. Use the command “show dhcp snooping
binding” to see the DHCP snooping binding table as shown next.
sysname# show dhcp snooping binding
MacAddress IpAddress Lease Type VLAN Port
----------------- --------------- ------------ ------------- ---- ---- 00:02:00:00:00:1c 10.10.1.16 6d23h59m20s dhcp-snooping 100 7
Total number of bindings: 1
2.2 How to Use DHCP Relay on the Switch
28
This tutorial describes how to configure your Switch to forward DHCP client requests to a specific
DHCP server. The DHCP server can then assign a specific IP address based on the information in the
DHCP requests.
XS3900-48F User’s Guide
2.2.1 DHCP Relay Tutorial Introduction
VLAN 102
DHCP Server
Port 2
PVID=102
172.16.1.18
A
192.168.2.3
In this example, you have configured your DHCP server (192.168.2.3) and want to have it assign a
specific IP address (say 172.16.1.18) and gateway information to DHCP client A based on the
system name, VLAN ID and port number in the DHCP request. Client A connects to the Switch’s
port 2 in VLAN 102.
Figure 5 Tutorial: DHCP Rela y Scenario
Chapter 2 Tutorials
2.2.2 Creating a VLAN
Follow the steps below to configure port 2 as a member of VLAN 102.
1Access the web configurator through the Switch’s management port.
XS3900-48F User’s Guide
29
Chapter 2 Tutorials
2Go to Basic Setting > Switch Setup and set the VLAN type to 802.1Q . Click Apply to save the
settings to the run-time memory.
3Click Advanced Application > VLAN > Static VLAN.
4In the Static VLAN screen, select ACTIVE, enter a descriptive name (VLAN 102 for example) in
the Name field and enter 102 in the VLAN Group ID field.
5Select Fixed to configure port 2 to be a permanent member of this VLAN.
6Clear the TX Tagging check box to set the Switch to remove VLAN tags before sending.
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XS3900-48F User’s Guide
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