Cisco Linksys SFE2000, SFE2000P, Linksys SFE2000P Administration Manual
¸
Release 1.0
LINKSYS SFE2000/SFE2000P FAST ETHERNET SWITCH
Linksys SFE2000/SFE2000P Fast Ethernet Switch
Administration Guide
© 2007 Cisco Systems, Inc.
Specifications are subject to change without notice.
Linksys, the Cisco Systems logo, the Linksys Logo, and the Linksys One logo are registered trademarks of Cisco Systems, Inc. All other trademarks mentioned in this document
are the property of their respective owners.
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Linksys One Ready Communications Solution
Contents
Chapter 1: Introduction - - - - - - - - - - - - - - - - - - - - - - - - -1
What’s in this User Guide? 1
Chapter 2: Getting to Know the Switch - - - - - - - - - - - - - - - - -3
Overview 3
The Front Panel 3
Front Panel LEDs 3
LAN Port LEDs 4
Uplink Port LEDs 4
Stack ID LEDs 5
Reset Switch 5
LAN Ports 5
Uplink Ports 6
The Back Panel 6
Power Port 7
Console Port 7
RPS Port 7
Chapter 3: Connecting the Switch - - - - - - - - - - - - - - - - - - - - 8
Overview 8
Before You Install the Switch... 8
Placement Options 9
Desktop Placement 9
Rack-Mount Placement 9
Wall-Mount Placement 10
Connecting the Cables 10
Stacking Multiple Switches 12
Connecting Cabling for Stacking 13
Managing Stacks 14
Building Automatically-Configured Stacks 14
Building Manually-Configured Stacks 14
Understanding Stack Resiliency 15
Understanding Advanced Stacking 15
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Unit IDs 15
Stack Unit Startup Process 17
Configuring Units and Ports 20
Setting the Unit’s Operational Mode 21
Configuring the Stack Master and Unit ID 21
Resetting the Unit to Factory Default Mode 23
Understanding LED Indicators 23
Stack Troubleshooting and Maintenance 24
Replacing a Failed Member Stack Unit in an Operational Stack 24
Replacing a Failed Stack Master Unit in an Operational Stack 25
Splitting a Stack 27
Merging Two Stacks 29
Understanding Stacking Cable Failure 31
Inserting Too Many Units into a Stack 31
Inserting a Standalone Unit into a Running Stack 32
Chapter 4: Console Configuration - - - - - - - - - - - - - - - - - - - 33
Overview 33
Configuring the HyperTerminal Application 33
Connecting to the Switch using Telnet or SSH 35
Configuring the Switch through the Console or Telnet Interface 35
Switch Main Menu 36
Chapter 5: Web Utility Configuration - - - - - - - - - - - - - - - - - 50
Overview 50
Accessing the Web-based Utility 50
Viewing Online Help 50
Appendix A: Linksys Contact Information - - - - - - - - - - - - - - - 51
Appendix B: Customer Site Survey - - - - - - - - - - - - - - - - - - 53
Appendix C: Limited Warranty - - - - - - - - - - - - - - - - - - - - 56
EXCLUSIONS AND LIMITATIONS 56
OBTAINING WARRANTY SERVICE 57
TECHNICAL SUPPORT 58
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Appendix D: Federal Communication Commission Interference Statement 59
Industry Canada Statement 59
EC Declaration of Conformity (Europe) 59
Appendix E: Specifications - - - - - - - - - - - - - - - - - - - - - - 60
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1
Chapter 1: Introduction
What’s in this User Guide?
Linksys One Ready Communications Solution
Chapter
1
Introduction
Welcom e
Thank you for choosing a Linksys Ethernet switch. This Ethernet switch allows you to quickly
and easily expand your Linksys One system. It delivers non-blocking, wire speed switching
for your network clients, plus multiple options for connecting to your network backbone.
Twenty four ports wire up your workstations or connect to other Linksys switches or devices.
LED indicators provide power, link, and activity status.
The Ethernet switch features monitoring and configuration via the Linksys One Portal, your
web browser, or the console interface. If your Ethernet switch is part of a Linksys One system,
the easiest way to manage it is with the Linksys One Portal — available only on the Linksys
One Services Router. Refer to the Linksys One Customer Premises Equipment Administration
Guide for more details on the Linksys One Portal.
The Ethernet switch supports numerous security features including the Remote Authorization
and Authentication (RADIUS) and Terminal Access Controller Access Control System
(TACACS+) protocols. With Simple Network Time Protocol (SNTP), the Ethernet switch can
synchronize its clock with a time server available on one of its attached networks.
The system is fully manageable using a combination of a database of MIB (Management
Information Base) variables, whose combined values represent all facets of the system state,
and the Simple Network Management Protocol (SNMP) protocol.
The “P” model of the Ethernet switch supports Power over Ethernet (PoE) which eliminates the
need to run 110/220 VAC power to wireless network, IP telephony, or other PoE powered
devices on the Linksys network. Use of a PoE system allows greater flexibility in locations of
network devices, and significantly decreasing installation costs. The entire PoE system can be
centrally powered by uninterruptible power supplies if necessary.
What’s in this User Guide?
This user guide covers the steps for setting up and using the Ethernet switch. Use the
instructions in this guide to help you connect the switch, set it up, and configure it to your
Linksys network. These instructions should be all you need to get the most out of your
Ethernet switch.
Linksys One Portal
Chapter
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2
Chapter 1: Introduction
What’s in this User Guide?
Linksys One Ready Communications Solution
This user guide contains the following chapters:
Chapter 1, "Introduction"
This chapter describes the Ethernet switch applications and provides an overview of the
content of this administration guide.
Chapter 2, "Getting to Know the Switch"
This chapter describes the physical features of the Ethernet switch.
Chapter 3, "Connecting the Switch"
This chapter explains how to install and connect the Ethernet switch.
Chapter 4, "Console Configuration"
This chapter describes how to use the console interface when you configure the Ethernet
switch.
Chapter 5, "Web Utility Configuration"
This chapter shows you how to configure the Ethernet switch using the Web-based Utility.
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Chapter 2: Getting to Know the Switch
Overview
Linksys One Ready Communications Solution
Chapter
2
Getting to Know the Switch
Overview
The SFE2000 and SFE2000P models are 24-port, layer-2 Ethernet switches that expand the
capability of the Linksys system. These two versions are functionally identical except the
SFE2000P model offers Power-over-Ethernet (PoE) which can be used to supply power to
various Linksys products over Ethernet cable.
The Front Panel
The Switch's LEDs and Ethernet ports are located on the front panel.
Front Panel LEDs
The Switch uses Light Emitting Diodes (LEDs) to indicate the status of numerous functions.
These functions are listed below.
1
5
6
2
4
3
1
System Status LEDs. Four LEDs indicate the status
of the Ethernet switch power, fan, RPS connectivity,
and stack master. For more details, refer to
”System Status LEDs,” on page 4.
2
LAN Ports. Twenty four 10/100 BaseT LAN ports
provide connectivity to other Linksys devices. For
more details, refer to ”LAN Ports,” on page 5.
3
Gigabit Interface Converter (mini-GBIC) Uplink
Ports. Two mini-GBIC ports provide uplink ports
which support network speeds of 10Mbps,
100Mbps, and 1000Mbps. For more details, refer
to
”Uplink Ports,” on page 6.
4
Uplink Ports. Four 10/100/1000 Uplink ports.
Ports G3 and G4 are shared with ports mini-GBIC
1 and mini-GBIC 2 respectively. These ports can
also be used for stacking multiple units. For more
details, refer to ”Uplink Ports,” on page 6.
5
Stack ID. If stacking is active, indicates the ID
number of the stack. For more details, refer to
”Stack ID LEDs,” on page 5.
6
RESET Switch. Resets the SFE2000/SFE2000P
Ethernet switch. For more details, refer to
”Reset
Switch,” on page 5
.
Chapter
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4
Chapter 2: Getting to Know the Switch
The Front Panel
Linksys One Ready Communications Solution
System Status LEDs
LAN Port LEDs
Uplink Port LEDs
PWR A green PWR LED lights to indicate that the Ethernet switch is powered
by internal power supplies. If the Ethernet switch is powered by a
remote power supply (RPS), this LED blinks red.
FAN A green FAN LED lights to indicate that the cooling fan is operating
properly. A blinking red FAN LED indicates that the cooling fan has
failed.
RPS A green RPS LED lights to indicate that RPS is connected and operating
properly. A blinking red RPS LED indicates an RPS fault.
MST A green MST LED indicates that this Ethernet switch is a stack master.
Act/Link The green Act/Link LEDs light to indicate a functional network link
through the corresponding port with an attached device. The Act
(Activity) LEDs flash to indicate that the Ethernet switch is actively
sending or receiving data over that port.
• On the SFE2000, a green Link LED indicates that the port is
linked to a 10/100Mbps device.
• On the SFE2000P, a green Link LED indicates that PoE is active
on that port.
Act/Link The green Act/Link LEDs light to indicate a functional network link
through the corresponding port with an attached device. The Act
(Activity) LEDs flash to indicate that the Ethernet switch is actively
sending or receiving data over that port.
Gigabit The Gigabit LED lights indicate a Gigabit connection on the
corresponding port.
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Chapter 2: Getting to Know the Switch
The Front Panel
Linksys One Ready Communications Solution
Chapter
2
Stack ID LEDs
Reset Switch
The Ethernet switch can be reset by inserting a pin or paper clip into the RESET opening. If
the reset switch is held for 10 seconds or longer, the Ethernet switch will be reset to its default
settings.
When a unit is reset to its default setting, the unit restarts in stackable mode using default
stacking ports with autonumbering enabled. Pressing the reset button on the master unit of a
stack resets all units in the stack.
LAN Ports
The Ethernet switch is equipped with 24 Ethernet ports.
Stack ID A green Stack ID LED indicates that this Switch is stacked and the
corresponding number indicates its stack ID. Range is 1 to 8.
CAUTION: All user-defined settings are
lost when you hold the Reset button for
10 seconds or longer; the Ethernet
switch reverts to its default settings.
1-24 The Switch is equipped with 24 auto-sensing, Ethernet (IEEE 802.3)
network ports, which use RJ-45 connectors. The Fast Ethernet ports
support network speeds of 10Mbps or 100Mbps. They can operate in
half and full-duplex modes. Auto-sensing technology enables each
port to automatically detect the speed of the device connected to it,
and adjust its speed and duplex accordingly.
Chapter
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Chapter 2: Getting to Know the Switch
The Back Panel
Linksys One Ready Communications Solution
Uplink Ports
The Switch is equipped with 4 uplink ports and 2 mini-GBIC uplink ports.
The Back Panel
The power port is located on the back panel of the Ethernet switch.
G1-G4 Ports G1-G4 are Ethernet (IEEE 802.3ab) uplink ports which support
network speeds of 10Mbps, 100Mbps, and 1000Mbps. Ports G3 and
G4 are shared with GBIC1 and GBIC2 ports, respectively. If shared
ports pairs are both connected, then the mini-GBIC port takes priority.
In stacking mode, two ports are used for stacking. Use only ports G1/
G2 for stacking. In standalone mode, all four ports can be used as
uplinks.
GBIC1/2 The Switch provides two mini-GBIC ports. The mini-GBIC port is a
connection point for a mini-GBIC expansion module, so the Switch can
be uplinked via fiber or copper to another switch. Each mini-GBIC port
provides a link to a high-speed network segment or individual
workstation at speeds of up to 1000Mbps.
Use the Linksys MGBT1, MGBSX1, or MGBLH1 mini-GBIC modules
with the Switch. The MGBSX1 and the MGBLH1 require fiber cabling
with LC connectors, while the MGBT1 requires a Category 5e Ethernet
cable with an RJ-45 connector.
1 2
3
DC INPUT FOR REMOTE
POWER SUPPLY SPECIFIED
IN MANUAL +12V, 7.5A
1
Power Port. The Power port is where you will
connect the power cord. For more details, refer to
”Power Port,” on page 7.
2
Console Port. The Console port is where you can
connect a serial cable to a PC’s serial port for
configuration. For more details, refer to ”Console
Port,” on page 7
.
3
RPS Port. Redundant Power Supply (RPS) port. For
more details, refer to
”RPS Port,” on page 7.
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Chapter 2: Getting to Know the Switch
The Back Panel
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Chapter
2
Power Port
The 100-240 VAC power cord is connected to the Power port.
Console Port
The Console port is where you connect a serial cable to a PC’s serial port for configuration
using your PC’s HyperTerminal program. Refer to ”Configuring the HyperTerminal
Application,” on page 33 for more information.
RPS Port
An optional Redundant Power Supply (RPS) is connected to the RPS port. An RPS enhances
the reliability of the Ethernet switch and it can keep the unit running if a power failure
occurs. Only use a Linksys RPS1000 Redundant Power Supply unit and a proper RPS cable
(RPSCBL1) with the Ethernet switch.
CAUTION: Only use the power cord
that is supplied with the Ethernet switch.
The unit may be damaged if the
incorrect power cord is used.
NOTE: Many modern laptop computers
are not supplied with serial ports. You
may use a USB-to-Serial adapter on
your laptop to connect to the console
serial port.
WARN IN G: Do not remove the cover
from the RPS port unless an RPS unit is
connected to the Ethernet switch. Keep
the RPS port covered when not in use.
Chapter
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Chapter 3: Connecting the Switch
Overview
Linksys One Ready Communications Solution
Connecting the Switch
Overview
This chapter will explain how to connect network devices to the Ethernet switch. For an
example of a possible network configuration, see the application diagrams shown below.
Before You Install the Switch...
When you choose a location for the Ethernet switch, observe the following guidelines:
• Make sure that the Ethernet switch will be accessible and that the cables can be easily
connected.
• Keep cabling away from sources of electrical noise, power lines, and fluorescent lighting
fixtures.
• Position the Ethernet switch away from water and moisture sources.
• To ensure adequate air flow, be sure to provide a minimum clearance of two inches
(50 mm) around the air intake and exhaust ports on the sides of the Ethernet switch.
• Do not stack free-standing Ethernet switches more than four units high. The stacking
configuration, described in ”Stacking Multiple Switches,” on page 12, allows up to eight
units to be logically stacked together. It is recommended that multiple Ethernet switches
be mounted in a rack when installed in this manner. Ethernet switches can be physically
placed at different locations; they do not have to be stacked at the same location.
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Chapter 3: Connecting the Switch
Placement Options
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Chapter
3
Placement Options
Before connecting cables to the Ethernet switch, first you will physically install the Ethernet
switch. Either set the Ethernet switch on its four rubber feet for desktop placement, mount it in
a standard-sized, 19-inch wide for rack-mount placement, or mount it on a wall with the
wall-mount brackets provided.
Desktop Placement
1. Attach the rubber feet to the recessed areas on the bottom of the Ethernet switch.
2. Place the Ethernet switch on a desktop near an AC power source.
Rack-Mount Placement
To mount the Ethernet switch in any standard-sized, 19-inch wide, (each Ethernet switch
requires 1RU of space in the rack), follow these instructions:
1. Remove the four front screws on one side of the Ethernet switch. Retain the screws for reinstallation.
2. Place one of the supplied spacers on the side of the Ethernet switch so the four holes
align to the screw holes.
3. Place a rack mount bracket next to the spacer and reinstall the four screws (removed in
step 1).
NOTE: The four supplied mounting
brackets can be used for either wall
mount or rack mount installations.
CAUTION: Keep enough ventilation
space for the Ethernet switch so it does
not exceed the environmental
restrictions mentioned in the
specifications.
Chapter
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Chapter 3: Connecting the Switch
Connecting the Cables
Linksys One Ready Communications Solution
4. Repeat steps 2 through 3 for the other side of the Ethernet switch.
5. Attach the Ethernet switch to the rack using the supplied screws.
Wall-Mount Placement
1. On one of the side corners, remove the four front screws on of the Ethernet switch. Retain
the screws for re-installation.
2. Place one of the supplied spacers on the side of the Ethernet switch so the four holes
align to the screw holes.
3. Place a rack mount bracket next to the spacer and reinstall the four screws (removed in
step 1). The wall mount brackets should point towards the bottom of the Ethernet switch.
4. Repeat steps 1 through 3 for the other corners of the Ethernet switch.
5. Attach the Ethernet switch to a wall with appropriate screws (not supplied).
Connecting the Cables
To connect network devices to the Ethernet switch, follow these instructions:
1. For 10/100Mbps devices, connect a Category 5 Ethernet network cable to one of the
numbered ports on the Ethernet switch. For a 1000Mbps device, connect a Category 5e
Ethernet network cable to one of the uplink ports on the Ethernet switch.
2. Connect the other end to a PC or other network device.
NOTE: The Ethernet switch, shown
below, is mounted with the ports located
on top. When the switch is mounted to a
wall, the ports can be oriented in any
direction.
CAUTION: Ensure that the Ethernet
switch is securely attached to the wall.
NOTE: If connecting an Ethernet switch
to an SVR3000 router, connect it to a
Cascade port on the SVR3000.
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Chapter 3: Connecting the Switch
Connecting the Cables
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Chapter
3
3. Repeat steps 2 and 3 to connect additional devices.
4. If you are using the mini-GBIC port, then insert the mini-GBIC module to the mini-GBIC
port. For detailed instructions, refer to the documentation supplied with the mini-GBIC
module.
5. If you use the console interface to configure the Ethernet switch, then connect the
supplied serial cable to the console port (located on the back of the Ethernet switch), and
tighten the captive retaining screws. Connect the other end to your PC’s serial port. (The
PC must be running VT100 terminal emulation software, such as HyperTerminal.)
6. Connect the supplied power cord to the power port, and plug the other end into an
electrical outlet.
7. Power on the network devices connected to the Ethernet switch. Each active port’s
corresponding Act/Link LED will light up on the Ethernet switch. If a port has an active
Gigabit connection, then its corresponding Gigabit LED will also light up.
If you will use the console interface to configure the Ethernet switch, proceed to ”Console
Configuration” section on page 33 for directions.
If you use the Web-based Utility to configure the Ethernet switch, proceed to ”Web Utility
Configuration” section on page 50.
CAUTION: Observe the orientation of
the mini-GBIC module before inserting it
into a mini-GBIC port. The bottom miniGBIC ports are upside down in relation
to the top mini-GBIC ports.
CAUTION: Make sure you use the
power cord that is supplied with the
Ethernet switch. Use of a different
power cord could damage the Ethernet
switch.
Chapter
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Chapter 3: Connecting the Switch
Stacking Multiple Switches
Linksys One Ready Communications Solution
Stacking Multiple Switches
The Stacking configuration provides multiple switch management through a single point as if
all stack master and stack members were a single Ethernet switch. All stack masters are
accessed through a single IP address through which the stack is managed. The stack can be
managed from the web-based interface or the console interface.
You can build stacks by building a new stack from a group of switches, or adding new units
to an existing stack. Stacks can be automatically or manually configured.
Switch software is downloaded separately for each stack member. However, all units in the
stack must be running the same software version.
A stack unit can operate in one of the following modes:
• Stand-alone — A switch operating in standalone mode runs as an independent,
single unit. All ports of a standalone switch operate as normal Ethernet links. A
standalone switch does not participate in a stack even if physically connected to a
stack.
• Stack — Indicates the device operates as a Stacked unit after the system is reset. A
switch operating in stack mode is not an independent unit, but a member of an
organized group of switches known as a stack. A stack consists of one Stack Master
control switch, one Master Backup switch and up to six Stack Member switches. In
some cases, a unit that is not connected to any other units may operate as a “stack–
of-one.”
The Stack Master unit manages the stack and is responsible for the configuration. The Master
Backup Runs as a slave unit and monitors the operation of the stack master. A stack member
runs a slave version of the switching algorithm, which allows the applications running on the
master unit to control the resources of the member unit.
NOTE: Two ports of each unit in a stack mode (ports 12
and 24 on GE units, and ports G1 and G2 on FE units)
are reserved for stacking links, and cannot be used for
regular network connections.
Stacking Highlights
• In stacking mode, each Ethernet switch is
given a unique ID, from 1 to 8.
• Stack IDs 1 and 2 are Master-Enabled units.
• All Ethernet switches in the stack must run the
same version of software.
• The Stack Master switch maintains the
configuration.
• Stack cannot combine Linksys SFE2000 and
SGE2000 family Ethernet switches.
• By factory default, Ethernet switches boot in
stacking mode.
• Stack ID can be user assigned or
automatically assigned.
• Stacking ports are available to user in
standalone mode as regular network ports.
• Settings are applied only to the master unit;
certain changes take place only after reset.
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Chapter 3: Connecting the Switch
Stacking Multiple Switches
Linksys One Ready Communications Solution
Chapter
3
By default, the Ethernet switch is in stacking mode. Using the console interface or the web
interface, you can change the mode to standalone mode.
When the device is in standalone mode, the stacking ports can be used as regular ports.
Connecting Cabling for Stacking
When the Ethernet switch is in stacking mode, ports G1 – G2 (copper Gigabit Ethernet
ports) are reserved as stacking ports and cannot be used as network ports. In this case,
either fiber or copper ports can be used for stacking.
TIP: Power the Ethernet switches in the
order that you want them in the Stack
ID. The first powered Ethernet switch in
a stack is assigned as the Master Unit,
the next powered unit is assigned as the
Master-Backup. The remaining units are
assigned Stack IDs in the order that they
are powered.
Chapter
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Chapter 3: Connecting the Switch
Managing Stacks
Linksys One Ready Communications Solution
Managing Stacks
Building Automatically-Configured Stacks
Building a New Stack
The easiest way to build a stack is to use a group of switches, each of which is in factory
default mode:
8. Connect the units physically through the stacking ports, using standard Ethernet cables.
9. Power the units on. After a short interval the stack becomes operational, with one of the
units selected as the Stack Master. The unit selected as Stack Master is indicated by a lit
green “MST” LED on its front panel. If a serial console connection is desired, the serial
cable should be connected to the console port of the unit serving as the Stack Master.
Adding Units to a Running Stack
1. Reset the units that will be added by restoring them to the factory default mode. Connect the
units physically to the stack.
2. Power the units on. After a short interval, they will become members of the stack.
Building Manually-Configured Stacks
You can manually configure stacks, including choosing a specific unit as the Stack Master.
You must assign a unique Unit ID (from 1 to 8) to each stack member.
Building a New Stack
1. Reset all relevant units to by restoring them to the factory default mode.
2. Connect the units physically through the stacking ports, using standard Ethernet cables.
3. Assign each unit its desired number, making sure no duplicates exist, and reset the stack.
NOTE: If the units to be used in building the new stack
have been used previously, we recommend that you reset
them to the factory default by holding the reset button for
at least 10 seconds before using them.
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Chapter 3: Connecting the Switch
Understanding Stack Resiliency
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Chapter
3
Adding Units to a Running Stack
1. Reset the units to be added by restoring them to the factory default mode.
2. Connect the units physically to the stack.
3. Power the units on. After a short interval, they will become stack members, but will have
automatically-assigned Unit IDs. Assign each such unit its desired Unit ID (using the
Stack Management Interface through the console port, by Telnet, or by using the
graphical user interface (GUI).
4. Reset the units to make this assignment permanent.
5. The unit that is assigned the Unit ID 1 is the Stack Master, and its front panel “MST” LED
lights green. The unit assigned the Unit ID 2 is the Backup Master.
Understanding Stack Resiliency
Stacks can be configured in ring or chain topologies. We recommend configuring the stack
in ring topology, due to the high resiliency in case of unit failure or stacking links failure.
Additionally, if a redundant power supply is present, we recommend connecting the Stack
Master and Backup Master units to the redundant power supply.
Understanding Advanced Stacking
To understand advanced stacking, you must understand Unit IDs and how they are
allocated, and the stack unit startup process.
Unit IDs
Each unit in a stack has an assigned unique Unit ID number. The following sections describe
the Unit IDs and their characteristics.
NOTE: We recommended that if you manually assign a
Unit ID to one unit, you manually assign Unit IDs to all
units. Using a mix of both system-assigned and manuallyassigned IDs in your network can impact system
performance.
Chapter
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Chapter 3: Connecting the Switch
Understanding Advanced Stacking
Linksys One Ready Communications Solution
Stack Master
The unit assigned the Unit ID number 1 serves as the Stack Master. All other units are stack
members. The Stack Master provides a single point of control, configuration and
management for the entire stack, and stores the configuration for all stack members.
(Members do not store any configuration information.)
Stack Backup Master
The unit assigned the Unit ID number 2 is a special stack member that serves as the stack
Backup Master. A stack Backup Master assumes the role of Stack Master for the remaining
stack members if the stack Master fails or is disconnected.
The Stack Master stores a copy of the active configuration on the Backup Master. This copy is
used only if the Backup Master assumes the role of Stack Master.
Stack Members
The units assigned the Unit IDs 3 through 8 are called stack members. A stack member
operates only as a member of the stack under the direction of an operational Stack Master
(or a Backup Master that has assumed the Stack Master role). Stack members are not
directly manageable and configurable, and must be managed through the Stack Master.
They do not contain any meaningful configuration information, including their own
configuration. If an operational Stack Master is not present and reachable, these units are
not functional.
Master-Enabled Units
Units that are assigned a Unit ID number of 1 or 2 are called master-enabled units. Only
master-enabled units participate in the Master Election process (see below) when they are
initialized, are inserted into a new stack, or lose connectivity with the existing Stack Master.
Only master-enabled units participate in the Master Election process and can become the
Stack Master or Backup Master. (Units that are assigned a Unit ID of 3 through 8 can only
NOTE: Only the configuration file is copied. Any
dynamically-filled tables (for example, learned
addresses) are not copied from the Stack Master to the
Backup Master. If the Backup Master assumes the role of
Stack Master, it builds its own dynamic tables.
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