Enterasys Networks VH-8G-L3 User Manual

Vertical Horizon

VH-8G-L3

Gigabit Ethernet

Switch

USER GUIDE

9033705-01

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9033705-01 9033705-01

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9033705-01

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9033705-01

Table of Contents

PREFACE................................................................................ 3

Purpose.......................................................................... 3

Audience ....................................................................... 3

Conventions .................................................................. 3

Organization.................................................................. 4

PRODUCT OVERVIEW ....................................................... 6

Description.................................................................... 6

Layer 3 Switching......................................................... 6

The Functions of a Layer 3 Switch............................... 7

Features......................................................................... 8

Ports .............................................................................. 8

Performance Features.................................................... 8

Layer 2 Features............................................................ 8

Layer 3 Switch Features................................................ 9

Traffic Classification and Prioritization...................... 10

Management................................................................ 10

Optional Redundant Power Supply............................. 11

Gigabit Ethernet Technology...................................... 11

Front Panel.................................................................. 12

Rear Panel ................................................................... 12

Side Panels.................................................................. 13

LED Indicators............................................................ 13

Feature Summaries...................................................... 14

Factory Defaults.......................................................... 17

2. INSTALLATION.............................................................. 20

1 9033705-01

Inspecting Your Shipment .......................................... 20

Installation................................................................... 20

Desktop or Shelf Installation ...................................... 21

Rack Installation ......................................................... 21

Power on ..................................................................... 22

Power Failure.............................................................. 22

3. CONNECTING THE SWITCH ...................................... 23

Switch to End Node .................................................... 23

Switch to Hub or Switch............................................. 23

APPENDIX A. TECHNICAL SPECIFICATIONS........... 25

APPENDIX B. FLOW CONTROL..................................... 28

APPENDIX C. ACRONYMS AND ABBREVIATIONS .. 29

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Preface

Purpose

This guide provides information about the features and
applications of the Enterasys Networks Vertical Horizon
VH-8G-L3 layer 3 switch.

Audience

This guide is intended for Ethernet Local Area Network
(LAN) administrators and Management Information Systems
(MIS) personnel with the following background:

• Working knowledge of Ethernet LANs

• Familiarity with Transmission Control Protocol/Internet

Protocol (TCP/IP) and Simple Network Management
Protocol (SNMP)

Conventions

This section describes the conventions used in this guide.

Message Formats

Two types of messages, identified by icons, appear in the
text:

3 9033705-01

A note informs you of special circumstances.

A caution indicates the possibility of equipment
damage

Keyboard Entries

This guide uses the following conventions for keyboard
entries:

• When you read “enter”, type the text and press the
[Enter] key.

• Example: Enter the Gateway IP address and press the
[Enter] key.

• When you read “select”, highlight the menu item and
press the [Enter] key.

Other Conventions

This guide uses the following typographical conventions:

• Initial Caps Menu titles and console
selections.

• [Enter] Used to designate the Enter or

Return key.

• Courier font Screen messages and user

prompts.

• Selection Describes a user-configurable

interface item.

• Field Describes a read-only information

item.

Organization

Chapter 1. Product Overview: Describes the features of

the Switch, front and rear panel components and application
examples.

Chapter 2. Installation: Describes the content of your
Switch shipment, lists site requirements, and provides

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mounting instructions. Instructions for making connections
and powering up the Switch are provided as well.

Chapter 3. Connecting the Switch: This describes how to
connect the VH-8G-L3 to your Ethernet network, including
connecting the Switch to an end node and connecting the
Switch to hub or switch.

Appendix A. Technical Specifications: Provides a list of
standards compliance and certifications as well as physical
and operational specifications.

Appendix B. Flow Control: Describes how the flow control
features are used to provide a mechanism for protecting the
Switch from overload conditions and to keep additional traffic
off the network.

Appendix C. Acronyms and Abbreviations: Provides
definitions for a list of common acronyms and abbreviations
used within the installation guide and the networking
industry.

5 9033705-01

Product Overview

This chapter provides the following information:

• Product Description

• Features

• Front and Rear Panel Component Descriptions

• Feature Summaries

• Application Example

Description

This section describes Layer 3 functionality and Layer 2 and
Layer 3 features of the VH-8G-L3. Some background
information about Ethernet/Fast Ethernet, Gigabit Ethernet,
and switching technology is presented. This is intended for
readers who may not be familiar with the concepts of layered
switching and routing but is not intended to be a complete or
in-depth discussion.

Layer 3 Switching

Layer 3 switching is an integration of two proven
technologies: switching and routing. In fact, Layer 3 switches
are running the same routing routines and protocols as
traditional routers. The main difference between traditional
routing and Layer 3 switching is the addition of a group of
Layer 2 switching domains and the execution of routing
routines for most packets via an ASIC – in hardware instead
of software.

Where a traditional router would have one, or at best a few,
Fast Ethernet ports, the VH-8G-L3 Layer 3 switch has 8
Gigabit Ethernet ports.

6 9033705-01

The VH-8G-L3 can be thought of as eight Gigabit Ethernet
Layer 2 switching domains with a wire-speed router between
each domain. It can be deployed in a network between a
traditional router and the intranetwork. The traditional router
and its associated WAN interface would then handle routing
between the intranetwork and the WAN (the Internet, for
example) while the Layer 3 switch would handle routing
within the LAN (between the Fast Ethernet Layer 2
domains).

The VH-8G-L3 can also replace key traditional routers for
data centers and server farms, routing between these
locations and the rest of the network, and providing 8 ports
of Layer 2 switching performance combined with wire-speed
routing.

The Functions of a Layer 3 Switch

Traditional routers, once the core components of large
networks, became an obstacle to the migration toward next­generation networks. Attempts to make software-based
routers forward packets more quickly were inadequate.

A layer 3 switch does everything to a packet that a traditional
router does:

• Determines forwarding path based on Layer 3

information

• Validates the integrity of the Layer 3 header via

checksum

• Verifies packet expiration and updates accordingly

• Processes and responds to any optional information

• Updates forwarding statistics in the Management

Information Base

• Applies security controls

A Layer 3 switch can be placed anywhere within a network
core or backbone, easily and cost-effectively replacing the

7 9033705-01

traditional collapsed backbone router. The VH-8G-L3 Layer
3 switch communicates with a WAN router using a standard
Gigabit Ethernet port. Multiple VH-8G-L3 switches can also
be linked.

Features

The VH-8G-L3 was designed for easy installation and high
performance in an environment where traffic on the network
and the number of users increase continuously.

Switch features include:

Ports

• Six 1000BASE-SX (SC-type fiber transceiver).

• Two GBIC-based Gigabit Ethernet ports.

• RS-232 DCE Diagnostic port (console port) for setting up

and managing the Switch via a connection to a console
terminal or PC using a terminal emulation program.

Performance Features

Layer 2 Features

• 16 Gbps switching fabric capacity.

• Wire speed packet forwarding rate per system.

• Store and forward switching scheme.

• Auto-polarity detection and correction of incorrect polarity on

the transmit and receive twisted-pair at each port.

• IEEE 802.3z compliant.

• IEEE 802.3x compliant Flow Control support.

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• 8K active MAC address entry table per device with automatic
learning and aging (10 to 9999 seconds).

• 512 KB packet buffer per device.

• Broadcast and Multicast storm filtering.

• Supports Port Mirroring.

• Supports Port Trunking – up to four trunk groups may be set

up. One trunk group can have from two to eight ports.

• 802.1D Spanning Tree support.

• 802.1Q Tagged VLAN support – up to 63 User-defined

VLANs per device (one VLAN is reserved for internal use).

GVRP – (GARP VLAN Registration Protocol, where GARP
represents a Generic Attribute Registration Protocol (GARP),
support for dynamic VLAN registration.

• 802.1p Priority support with 4 priority queues.

• IGMP Snooping support.

Layer 3 Switch Features

• Wire speed IP forwarding.

• Hardware-based Layer 3 IP switching.

• IP packet forwarding rate of 12 Mpps.

• 2K active IP address entry table per device.

• Supports RIP – (Routing Information Protocol) version I and

II.

• Supports IP version 4.

• IGMP version 1 and 2 support (RFC 1112 and RFC 2236).

IGMP can be globally enabled or disabled for all VLANs.

9 9033705-01

• Supports PIM Dense Mode (draft-ietf-pim-v2-dm-03.txt).

• Supports DVMRP (draft-ietf-idmr-dvmrp-v3-09.txt).

• Supports Username to IP address mapping.

• Supports IP multi-netting.

• Supports IP packet de-fragmentation.

• Supports Path MTU discovery.

• Supports 802.1D frame support.

Traffic Classification and Prioritization

• Based on 802.1p priority bits.

• Based on IP source and destination addresses.

• 4 priority queues.

• Supports Port and MAC based priorities.

Management

• RS-232 console port for out-of-band network
management via a console terminal or PC.

• Spanning Tree Algorithm Protocol for creation of
alternative backup paths and prevention of network
loops.

• SNMP v.1 Agent.

• Telnet remote control console.

• Fully configurable either in-band or out-of-band control

via SNMP based software.

• Flash memory for software upgrades. This can be done
in-band via TFTP or out-of-band via the console.

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• Built-in SNMP management:

 Bridge MIB (RFC 1493)

 RMON MIB (RFC 1757) – 4 groups

 MIB-II (RFC 1213)

 Interface MIB ext. (RFC 2233)

 CIDR MIB (RFC 2096) – excluding the IP

Forwarding Table.

 802.1p MIB (RFC 2674).

• Supports Web-based management.

• TFTP support.

• BOOTP support.

• IP filtering on the management interface.

• DHCP Client support.

• DHCP Relay Agent.

• Password enabled.

Optional Redundant Power Supply

The VH-8G-L3 Gigabit Ethernet Layer 3 Switch supports an
optional Redundant Power Supply to provide automatic
power supply monitoring and switchover to a redundant
power supply in case of a failure in the VH-8G-L3’s internal
power supply.

Gigabit Ethernet Technology

Gigabit Ethernet is an extension of IEEE 802.3 Ethernet
utilizing the same packet structure, format, and support for
CSMA/CD protocol, full duplex, flow control, and
management objects, but with a tenfold increase in

11 9033705-01

theoretical throughput over 100Mbps Fast Ethernet and a
one hundred-fold increase over 10Mbps Ethernet. Since it is
compatible with all 10Mbps and 100Mbps Ethernet
environments, Gigabit Ethernet provides a straightforward
upgrade without wasting a company’s existing investment in
hardware, software, and trained personnel.

Front Panel

The front panel of the Switch consists of LED indicators, an
RS-232 communication port, two GBIC-based Gigabit
Ethernet ports, and six 1000BASE-SX ports.

Figure 1-1. Front panel view of the Switch

• Comprehensive LED indicators display the status of
the switch and the network (see the LED Indicators
section below).

• An RS-232 DCE console port for setting up and
managing the switch via a connection to a console
terminal or PC using a terminal emulation program.

• Six Gigabit Ethernet ports (1000BASE-SX).

• Two GBIC-based Gigabit Ethernet ports.

Rear Panel

The rear panel of the Switch consists of a slot for the
optional Redundant Power Supply and an AC power
connector.

Figure 1-2. Rear panel view of the Switch

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• The AC power connector is a standard three-pronged

connector that supports the power cord. Plug-in the
female connector of the provided power cord into this
socket, and the male side of the cord into a power
outlet. Supported input voltages range from 100 ~
240 VAC at 50 ~ 60 Hz.

Side Panels

The right side panel of the Switch contains two system fans
(see the top part of the diagram below). The left side panel
contains heat vents.

Figure 1-3. Side panel views of the Switch

• The system fans are used to dissipate heat. The

sides of the system also provide heat vents to serve
the same purpose. Do not block these openings, and
leave at least 6 inches of space at the rear and sides
of the Switch for proper ventilation. Be reminded that
without proper heat dissipation and air circulation,
system components might overheat, which could lead
to system failure.

LED Indicators

The LED indicators of the Switch include Power, Link/Act,
and RDP in use. The following shows the LED indicators for
the Switch along with an explanation of each indicator.

13 9033705-01

Figure 1-4. The LED indicators

• Power This indicator on the front panel will light
green approximately 2 seconds after the Switch is
powered on to indicate the ready state of the device.
The LED will blink green while downloading new
software for the Switch, or if the system’s
configuration has changed and will light yellow when
an error occurs.

• Link/Act These indicators are located to the left of
each port. They are lit when there is a secure
connection (or link) to a device at any of the ports.
The LEDs blink whenever there is reception or
transmission (i.e. Activity--Act) of data occurring at a
port.

• RDP in use This indicator is lit when the optional
Redundant Power Supply is being used.

Feature Summaries

The following summaries describe VH-8G-L3 features in
areas such as standards compliance, functionality,
performance, and options.

Local Console Management

A local console is a terminal or a workstation running a
terminal emulation program that is connected directly to the
Switch via the RS-232 console port on the front of the
Switch. A console connection is referred to as an ‘Out-of­Band’ connection, meaning that console is connected to the
switch using a different circuit than that used for normal
network communications. So, the console can be used to set
up and manage the Switch even if the network is down.

Local console management uses the terminal connection to
operate the console program built-in to the Switch. A

9033705-01 14

network administrator can manage, control and monitor the
switch from the console program.

The VH-8G-L3 contains a CPU, memory for data storage,
flash memory for configuration data, operational programs,
and SNMP agent firmware. These components allow the
switch to be actively managed and monitored from either the
console port or the network itself (out-of-band, or in-band).

SNMP Management

The Simple Network Management Protocol (SNMP) is an
OSI layer 7 (the application layer) protocol for remotely
monitoring and configuring network devices. SNMP enables
network management stations to read and modify the
settings of gateways, routers, switches, and other network
devices. SNMP can be used to perform many of the same
functions as a directly connected console, or can be used
within an integrated network management software package
such as NetSight.

Flow Control

The VH-8G-L3 supports flow control (back pressure
handling) on a per-port basis. The limit at which flow control
is applied to a port is based on the amount of memory used
by the packets on an input port.

• 802.3x Flow Control – if the port is configured in full

duplex mode, a MAC PAUSE packet is sent to inhibit the
flow of packets to the port for a short amount of time.

Spanning Tree Protocol

The VH-8G-L3 switch complies with the IEEE 802.1D
Spanning Tree Protocol standard and allows for the blocking
of links between switches that form loops within the network.
When multiple links between switches are detected, a
primary link is established. Duplicated links are blocked from
use and become standby links. The protocol allows for the
duplicate links to be used in the event of a failure of the

15 9033705-01

primary link. Once the Spanning Tree Protocol is configured
and enabled, primary links are established and duplicated
links are blocked automatically. The reactivation of the
blocked links (at the time of a primary link failure) is also
accomplished automatically – without operator intervention.

Port Trunking

Port trunking is used to combine a number of ports together
to make a single high-bandwidth data pipeline. The
participating ports are called members of a port trunking
group, with one port designated as the master port of the
group. Since all members of the port trunking group must be
configured to operate in the same manner, the configuration
of the master port is applied to all members of the port
trunking group. Thus, when configuring the ports in a port
trunking group, you only need to configure the master port.

The VH-8G-L3 supports 4 port trunking groups, which may
include from 2 to 8 switch ports each.

IEEE 802.1Q VLANs

IEEE 802.1Q (tagged) VLANs are implemented on the
VH-8G-L3. 802.1Q VLANs allow tagging, which enables
them to span the entire network (assuming all switches on
the network are IEEE 802.1Q-compliant). IEEE 802.1Q
VLANs also allow for dynamic VLAN registration using
GVRP.

VLANs allow a network to be segmented in order to reduce
the size of broadcast domains. All packets entering a VLAN
will only be forwarded to the stations (over IEEE 802.1Q
enabled switches) that are members of that VLAN, and this
includes broadcast, multicast and unicast packets from
unknown sources.

VLANs can also provide a level of security to your network.
IEEE 802.1Q VLANs will only deliver packets between
stations that are members of the VLAN.

Broadcast Storm Control

9033705-01 16

Broadcast storms consist of broadcast packets that flood
and/or are looped on a network causing noticeable
performance degradation and in extreme cases, network
failure. Broadcast storms can be caused by malfunctioning
NICs, bad cable connections and applications or protocols
that generate broadcast traffic, among others.

Broadcast storms have long been a concern for network
administrators with routers traditionally being used to prevent
their occurrence, and if that failed, limit their scope.
However, with the advent of VLANs, switches are now able
to limit broadcast domains better and cheaper than routers.
The VH-8G-L3 has broadcast sensors and filters built into
each port to control broadcast storms.

IP Routing

IP is responsible for getting packets to the destination
specified in the destination address. The task of determining
how to get a packet from the source to the destination is
referred to as routing.

The VH-8G-L3 allows the creation of IP subnets and can
perform IP routing between them. Each IP subnet
corresponds to an IEEE 802.1Q VLAN, previously defined
on the Switch.

Factory Defaults

Table 1-1 lists the default settings for the Switch
configuration parameters. Each parameter can be changed
via the console menus or Telnet.

Parameter Default Value

Load Mode Ethernet

Switch Operation Mode Layer 2

Configuration Update Disabled

Firmware Update Disabled

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Configuration File Name None

Firmware File Name None

Out-Of-Band Baud Rate 9600

RS232 Mode Console

IP Address 0.0.0.0

Subnet Mask 0.0.0.0

Default Gateway 0.0.0.0

BootP Service Enabled

TFTP Server IP Address 0.0.0.0

IGMP Time Out 260 secs

IGMP Disabled

Partition Mode Enabled

Address table lock Disabled

Device HOL Disabled

Port HOL Enabled

Console Time Out 15 min

User Name Admin

Password None

Device STA Enabled

Port Enable Enabled

Bridge Max Age 20 secs

Bridge Hello Time 2 sec

Bridge Forward Delay 15 sec

Bridge Priority 32768

Device STA Cost For A 10 Mbps Port 100

Device STA Cost For A 100 Mbps Port 19

Device STA Cost For A 1000 Mbps Port 4

Device STA Priority 128

Forwarding Table Aging Time 300 secs

Address Lookup Mode Level 1

Auto-Negotiation Enabled

Flow Control Disabled

9033705-01 18

Backpressure Disabled

Port Lock Disabled

Broadcast Storm Rising Action Do Nothing

Broadcast Storm Falling Action Do Nothing

Broadcast Storm Rising Threshold 128Kpps

Broadcast Storm Falling Threshold < 128Kpps

Community String “public”, “private”

VLAN Mode IEEE 802.1Q

Management In A VLAN All

SNMP VLAN(802.1Q) 1

Default Port VID 1

Ingress Rule Checking Disabled

Mirror Src Port <->Target Port 12

Port Mirroring Disabled

DVMRP (L3 Mode Only) Disabled

PIM Dense Mode (L3 Mode Only) Disabled

Table 1-1. Factory Default Settings

19 9033705-01 19 9033705-01

2. Installation

Inspecting Your Shipment

Open the shipping carton of the Switch and carefully unpack
its contents. The carton should contain the following items:

• One VH-8G-L3 8-port Gigabit Ethernet Layer 3
Switch.

• Mounting kit: 2 mounting brackets and screws.

• Four rubber feet with adhesive backing.

• One AC power cord.

• One ESD wrist strap.

• Product Documentation.

If any item is found missing or damaged, please contact your
local Enterasys sales agent for replacement.

Installation

Use the following guidelines when choosing a place to install
the Switch:

• The surface must support at least 3 kg.

• The power outlet should be within 1.82 meters (6

feet) of the device.

• Visually inspect the power cord and see that it is
secured to the AC power connector.

• Make sure that there is proper heat dissipation from
and adequate ventilation around the Switch. Do not
place heavy objects on the Switch.

9033705-01 20

Desktop or Shelf Installation

When installing the Switch on a desktop or shelf, the rubber
feet included with the device should first be attached. Attach
these cushioning feet on the bottom at each corner of the
device. Allow adequate space for ventilation between the
device and the objects around it.

Figure 2-1. Installing rubber feet for desktop installation

Rack Installation

The VH-8G-L3 can be mounted in an EIA standard-sized,
19-inch rack, which can be placed in a wiring closet with
other equipment. To install, attach the mounting brackets on
the switch’s side panels (one on each side) and secure them
with the screws provided.

Figure 2- 2A. Attaching the mounting brackets

Then, use the screws provided with the equipment rack to
mount the Switch on the rack.

21 9033705-01

Figure 2-2B. Installing the Switch on an equipment rack

Power on

The VH-8G-L3 can be used with AC power supply 100-240
VAC, 50 - 60 Hz. Simply connect the power cord to the AC
power connector located on the rear panel of the Switch and
to AC power outlet. The Switch’s power supply will then
adjust to the local power source automatically and may be
started without having any or all LAN segment cables
connected.

After the AC power is connected, the LED indicators should
respond as follows:

• The Power LED indicator will remain steady while the
Switch loads onboard software and performs a self­test.

• When linked with the redundant power supply, the
“RDP in use” LED will blink orange.

Power Failure

As a precaution in the event of a power failure, unplug the
Switch. When power is resumed, plug the Switch back in.

9033705-01 22

3. Connecting The Switch

This chapter describes how to connect the VH-8G-L3 to your
Ethernet network.

Switch to End Node

A PC can be connected to the Switch via a fiber optic cable.
The PC can be connected to any of the eight ports of the
Switch.

Figure 3-1. Example of the Switch connected to a PC or

Workstation

The LED indicators for the port the end node is connected to
are lit according to the capabilities of the NIC. If LED
indicators are not illuminated after making a proper
connection, check the PC’s LAN card, the cable, switch
conditions, and connections.

The following LED indicator state is possible for an end node
to switch connection: The Link/Act LED indicator lights up
upon hooking up a PC that is powered on.

Switch to Hub or Switch

The Switch can be connected to another switch or other
devices (routers, bridges, etc.) via a fiber optic cable.

23 9033705-01

Figure 3-2. Example of Switch to switch connection

9033705-01 24

Appendix A. Technical Specifications

General

Standards: IEEE 802.3z 1000BASE-SX Gigabit

Protocols: CSMA/CD

Data Transfer Rates:

Gigabit Ethernet

Topology: Star

Network Cables:

Fiber Optic: IEC 793-2:1992

Number of Ports: 8 Gigabit Ethernet (including 2 GBIC-based)

Ethernet

IEEE 802.1 P/Q VLAN

IEEE 802.3x Full-duplex Flow Control

ANSI/IEEE 802.3 auto-negotiation

Half-duplex Full-duplex

n/a 2000Mbps

Type A1a - 50/125um multimode

Type A1b - 62.5/125um multimode

Use SC optical connector

Physical and Environmental

AC inputs: 100 - 240 VAC, 50/60 Hz (internal universal

Power Consumption: 40 watts maximum

DC fans: 4 built-in 40 x 40 x10 mm fans

Operating Temperature: 0 to 40 degrees Celsius

9033705-01 25

power supply)

Storage Temperature: -40 to 70 degrees Celsius

Humidity: Operating: 10% to 85% RH non-condensing

Dimensions: 441 mm x 210 mm x 43 mm (1U), 19 inch

Weight: 2.61 kg

Safety: UL/CUL, TUV/GS

rack-mount width

EMI: FCC Class A, CE Class A, VCCI Class A,

BSMI Class A, C-Tick Class A

FCC Part 15/IECES-003 (Canada), VCCI
Class A ITE, EN55022/EN50082-1 or
EN%%o24, C-Tick (AS/NZS3548, BSMI
(CNS 13438)

UL 1950 & CSA22.2 No 950, IEC 950 (CB),
TUV (EN60950)

9033705-01 26 9033705-01 26

Performance

Transmission

Method:

RAM Buffer: 16 MB per device

Filtering Address

Table:

Packet Filtering/

Forwarding Rate:

MAC Address

Learning:

Forwarding Table

Age Time:

Store-and-forward

8K MAC address per device

Full-wire speed for all connections

1,488,000 pps per port (for 1000Mbps)

Automatic update.

Max age:10–9999 seconds
Default = 300.

27 9033705-01

Appendix B. Flow Control

Flow control is a mechanism that allows you to protect the
switch from overload conditions and to keep additional traffic
off the network when excessive congestion will result.

Flow Control for Half- and Full-Duplex Applications

Each port of the switch has a transmit queue which buffers
frames to be sent out on that port. In this example, large
amounts of data are being sent from Workstation A
(connected to port X) and other ports on the switch to
Workstation B (connected to port Y). The queue on port Y
starts filling up with data until it reaches a determined
threshold. The packet that causes the threshold to be
exceeded triggers the flow-control function on the port from
which the packet entered the switch, in this case port X.

Since port X is configured with flow control set to Enabled,
the switch responds by initiating a pause frame (full-duplex
applications) or back-pressure mechanism (half-duplex
applications). The pause frame causes Workstation A to stop
sending packets. After a certain amount of time has elapsed,
determined by a value in the pause frame, Workstation A will
resume sending data. Similarly, the back-pressure
mechanism forces Workstation A to stop sending packets by
inducing collisions on port X.

The pause-frame flow-control mechanism supported by the
VH-8G-L3 conforms with the IEEE 802.3x specification for
full-duplex flow control.

For the full-duplex pause-frame mechanism to work, the
device connected to the switch port must also support IEEE

802.3x flow control.

Flow control is configurable per port in the Configure Ports
screen of the console menu, using the on-board Web agent,
or via SNMP.

28 9033705-01

Appendix C. Acronyms and Abbreviations

Term Definition

10BASE-T 10 Mbps twisted-pair Ethernet

100BASE-TX 100 Mbps twisted-pair Fast Ethernet

100BASE-FX 100 Mbps fiber option Fast Ethernet

1000BASE-T 1000 Mbps twisted-pair Gigabit Ethernet

1000BASE-SX 1000 Mbps fiber option short-wavelength

Gigabit Ethernet

1000BASE-LX 1000 Mbps fiber option long-wavelength

Gigabit Ethernet

ANSI American National Standards Institute

BootP Bootstrap Protocol

CAT5e Category 5e Ethernet wiring standard

CRC Cyclic Redundancy Check

CSMA/CD Carrier Sense Multiple Access/Collision

Detection

DCE Data Communications Equipment (modem)

DSR Data Send Ready

DTE Data Terminal Equipment

DTR Data Terminal Ready

ESD Electrostatic Discharge

FCS Frame Check Sequence

HTTP Hypertext Transfer Protocol

ICMP Internet Control Message Protocol

IEEE Institute of Electrical and Electronics

Engineers

IP Internet Protocol

LAN Local Area Network

LED Light Emitting Diode

MAC Media Access Control

9033705-01 29

MDI Media Dependent Interface

MDI Media Device Interface

MIB Management Information Base

RFC Request for Comment

RMON Remote Monitoring

RXD Receive Data.38

SNMP Simple Network Management Protocol

TCP/IP Transmission Control Protocol/Internet

Protocol

TFTP Trivial File Transfer Protocol

TXD Transmit Data

UTP Unshielded Twisted Pair

VLAN Virtual LAN

9033705 30 9033705 30

Index

AC inputs................................ 25

AC power cord........................ 20

Accessory pack ....................... 20

Auto polarity detection ............. 8

Bridge MIB (RFC 1268)......... 11

Broadcast domains.................. 16

Broadcast storms..................... 17

Connections

Switch to End Node ........... 23

Switch to Hub or Switch .... 23

Console port........................ 8, 12

Diagnostic port.......................... 8

Dimensions ............................. 26

End Node ................................ 23

Flash memory ......................... 10

Front Panel.............................. 12

Gigabit Ethernet...................... 11

Humidity................................. 26

IEEE 802.1Q tagging.............. 16

LED Indicators........................ 13

MAC Address Learning.......... 27

Management............................ 10

Master port.............................. 16

MIB-I (RFC 1156) .................. 11

MIB-II (RFC 1213)................. 11

Operating Temperature ........... 25

Power ......................................14

Power Consumption................ 25

RAM Buffer............................ 27

Rear Panel......................... 12, 13

RS-232 ...................................... 8

Security ................................... 16

Setup ....................................... 20

Spanning Tree Algorithm .......10

Storage Temperature............... 26

Store and forward switching ..... 8

Transmission Methods............ 27

Trunk group ............................16

Unpacking............................... 20

Weight..................................... 26

9033705-01 31