Cisco WS-C2950-24 User manual

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Catalyst 2900 Series XL and
Catalyst 3500 Series XL
Software Configuration Guide
Cisco IOS Release 12.0(5)WC(1)
April 2001
Customer Order Number: DOC-786511=
Text Part Number: 78-6511-05

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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
Copyright © 1998–2001, Cisco Systems, Inc.
All rights reserved.

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CONTENTS
Preface xv
Audience xv
Purpose xv
Organization xvii
Conventions xviii
Related Publications xix
Obtaining Documentation xx
World Wide Web xx
Cisco Documentation CD-ROM xx
Ordering Documentation xxi
Documentation Feedback xxi
Obtaining Technical Assistance xxii
Cisco.com xxii
Technical Assistance Center xxii
Contacting TAC by Using the Cisco TAC Website xxiii
Contacting TAC by Telephone xxiii

Contents
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CHAPTER 1Overview 1-1
Features 1-1
Management Options 1-7
ManagementInterface Options 1-7
Advantages of Using CMS and Clustering Switches 1-8
Network Configuration Examples 1-10
Design Concepts for Using the Switch 1-10
Small to Medium-Sized Network Configuration 1-14
Collapsed Backbone and Switch Cluster Configuration 1-16
Large Campus Configuration 1-18
Hotel Network Configuration 1-20
Multidwelling Configuration 1-23
CHAPTER 2Getting Started with CMS 2-1
Features 2-2
Cluster Managerand VSM 2-3
Cluster Tree 2-6
Switch Images 2-7
System LED 2-7
Redundant Power System LED 2-8
PortModes and LEDs 2-9
Menu Bars 2-14
Toolbar 2-17
Port Pop-Up Menu 2-18
Device Pop-Up Menu 2-19
Cluster View andCluster Builder 2-21
Topology 2-24
Menu Bar 2-26
Toolbar 2-27

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Contents
Device Pop-Up Menu 2-28
Candidate, Member, and Link Pop-Up Menus 2-29
CMS Window Components 2-31
Host Name List 2-32
Tabs 2-32
Lists 2-32
Buttons 2-33
Online Help 2-33
Accessing CMS 2-35
Saving Configuration Changes 2-37
Using Different Versions of Web-Based Switch Management Software 2-38
Where to Go Next 2-38
CHAPTER 3Getting Started with the CLI 3-1
Command Usage Basics 3-2
Accessing Command Modes 3-2
Abbreviating Commands 3-4
Using the No and Default Forms of Commands 3-5
Redisplaying a Command 3-5
Getting Help 3-5
Command-Line Error Messages 3-7
Accessing the CLI 3-8
Accessing the CLI from a Browser 3-9
Saving Configuration Changes 3-10
Where to Go Next 3-10

Contents
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CHAPTER 4General Switch Administration 4-1
Basic IP Connectivity to the Switch 4-2
Switch SoftwareReleases 4-2
Console Port Access 4-3
Telnet Access to the CLI 4-4
HTTP Access to CMS 4-5
SNMP Network Management Platforms 4-6
Using FTP to Access the MIB Files 4-7
Using SNMP to Access MIB Variables 4-7
Default Settings 4-9
CHAPTER 5Clustering Switches 5-1
Understanding Switch Clusters 5-2
Command Switch Characteristics 5-2
Standby Command Switch Characteristics 5-3
Candidate and Cluster Member Characteristics 5-3
Planning a Switch Cluster 5-4
Automatic Discovery of ClusterCandidates 5-4
Standby Command Switches 5-5
IP Addresses 5-8
Passwords 5-8
Host Names 5-10
SNMP Community Strings 5-10
Management VLAN 5-11
Network Port 5-12
NAT Commands 5-12
LRE Profiles 5-13
Availability of Switch-Specific Features in Switch Clusters 5-13

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Contents
Creating a Switch Cluster 5-13
Designating and Enabling a Command Switch 5-14
Adding and Removing Cluster Members 5-14
Designating and Enabling Standby Command Switches 5-17
Verifying a Switch Cluster 5-19
Displaying an Inventory of the Clustered Switches 5-19
Displaying Link Information 5-20
Using the CLI to Manage Switch Clusters 5-21
Using SNMP to Manage Switch Clusters 5-22
CHAPTER 6Configuring the System 6-1
Changing IP Information 6-2
Manually Assigning and Removing Switch IP Information 6-2
Using DHCP-Based Autoconfiguration 6-4
Understanding DHCP-Based Autoconfiguration 6-4
DHCP Client Request Process 6-5
Configuring the DHCP Server 6-6
Configuring the TFTP Server 6-7
Configuring the Domain Name and the DNS 6-8
Configuring the Relay Device 6-9
Obtaining Configuration Files 6-10
Example Configuration 6-12
Changing the Password 6-15
Setting the System Date and Time 6-17
Configuring Daylight Saving Time 6-17
Configuring the Network Time Protocol 6-17
Configuring the Switch as an NTP Client 6-17
Enabling NTP Authentication 6-18
Configuring the Switch for NTP Broadcast-Client Mode 6-18

Contents
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Configuring SNMP 6-18
Disabling and Enabling SNMP 6-18
Entering Community Strings 6-19
Adding Trap Managers 6-19
Configuring CDP 6-22
Configuring CDP for Extended Discovery 6-22
Configuring STP 6-24
Supported STP Instances 6-24
Using STP to Support Redundant Connectivity 6-25
Disabling STP 6-25
Accelerating Aging to Retain Connectivity 6-26
Configuring STP and UplinkFast in a Cascaded Cluster 6-26
Configuring Redundant Links By Using STP UplinkFast 6-28
Enabling STP UplinkFast 6-30
Configuring Cross-Stack UplinkFast 6-31
How CSUF Works 6-31
Events that Cause Fast Convergence 6-33
Limitations 6-35
Connecting the Stack Ports 6-35
Configuring Cross-Stack UplinkFast 6-37
Changing the STP Parameters for a VLAN 6-38
Changing the STP Implementation 6-39
Changing the Switch Priority 6-39
Changing the BPDUMessage Interval 6-40
Changing the Hello BPDU Interval 6-40
Changing the Forwarding Delay Time 6-41
STP Port States 6-41
Enabling the Port Fast Feature 6-42
Changing the Path Cost 6-43
Changing the Port Priority 6-43
Configuring STP Root Guard 6-44

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Contents
Managing the ARP Table 6-45
Controlling IP Multicast Packets through CGMP 6-46
Enabling the Fast Leave Feature 6-47
Disabling the CGMP Fast Leave Feature 6-47
Changing the CGMP Router Hold-Time 6-48
Removing Multicast Groups 6-48
Configuring MVR 6-49
Using MVR in a Multicast Television Application 6-49
Configuration Guidelines and Limitations 6-51
Setting MVR Parameters 6-53
Configuring MVR 6-54
Managing the MAC Address Tables 6-56
MAC Addresses and VLANs 6-56
Changing the Address Aging Time 6-57
Removing Dynamic Address Entries 6-58
Adding Secure Addresses 6-58
Removing Secure Addresses 6-59
Adding Static Addresses 6-59
Removing Static Addresses 6-60
Configuring Static Addresses for EtherChannel Port Groups 6-61
Configuring TACACS+ 6-61
Configuring the TACACS+ Server Host 6-62
Configuring Login Authentication 6-64
Specifying TACACS+ Authorization for EXEC Access and Network
Services 6-65
Starting TACACS+ Accounting 6-66
Configuring a Switch for Local AAA 6-67

Contents
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CHAPTER 7Configuring the Switch Ports 7-1
Changing the Port Speed and Duplex Mode 7-2
Connecting to Devices That Do Not Autonegotiate 7-2
Setting Speed and Duplex Parameters 7-3
Configuring Flow Control on Gigabit Ethernet Ports 7-3
Configuring Flooding Controls 7-4
Enabling Storm Control 7-4
Disabling Storm Control 7-5
Blocking Flooded Traffic on a Port 7-6
Resuming Normal Forwarding on a Port 7-7
Enabling a Network Port 7-7
Disabling a Network Port 7-8
Configuring UniDirectional Link Detection 7-9
Creating EtherChannelPort Groups 7-10
Understanding EtherChannel Port Grouping 7-10
PortGroup Restrictions on Static-Address Forwarding 7-11
Creating EtherChannelPort Groups 7-12
Configuring Protected Ports 7-13
Enabling Port Security 7-14
Defining the Maximum Secure Address Count 7-15
Enabling Port Security 7-15
Disabling Port Security 7-15
Enabling SPAN 7-16
Disabling SPAN 7-16
Configuring Voice Ports 7-17
Preparing a Port for a Cisco 7960 IP Phone Connection 7-18
Configuring a Port to Connect to aCisco 7960 IP Phone 7-18
Overriding the CoS Priority of Incoming Frames 7-19
Configuring Voice Ports to Carry Voice and Data Traffic on Different
VLANs 7-20

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Contents
Configuring Inline Power on the Catalyst 3524-PWR Ports 7-21
Configuring the LRE Ports 7-22
LRE Links and LRE Profiles 7-22
LRE Ethernet Links 7-25
Assigning a Public Profile to AllLRE Ports 7-27
Assigning a Private Profile to an LRE Port 7-28
CHAPTER 8Configuring VLANs 8-1
Overview 8-2
Management VLANs 8-4
Changing the Management VLAN fora New Switch 8-5
Changing the Management VLAN Through a Telnet Connection 8-6
Assigning VLAN Port Membership Modes 8-7
VLAN Membership Combinations 8-8
Assigning Static-Access Ports to a VLAN 8-10
Overlapping VLANs and Multi-VLAN Ports 8-11
Using VTP 8-12
The VTPDomain 8-13
VTP Modes and Mode Transitions 8-14
VTP Advertisements 8-15
VTP Version 2 8-16
VTP Pruning 8-17
VTP Configuration Guidelines 8-18
Domain Names 8-18
Passwords 8-18
Upgrading from Previous Software Releases 8-19
VTP Version 8-19
Default VTP Configuration 8-20

Contents
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Configuring VTP 8-20
Configuring VTP Server Mode 8-21
Configuring VTP ClientMode 8-22
Disabling VTP (VTP Transparent Mode) 8-23
Enabling VTP Version 2 8-24
Disabling VTP Version 2 8-25
Enabling VTP Pruning 8-25
Monitoring VTP 8-26
VLANs in the VTP Database 8-27
Token Ring VLANs 8-27
VLAN Configuration Guidelines 8-28
Default VLAN Configuration 8-28
Configuring VLANs in the VTP Database 8-32
Adding a VLAN 8-33
Modifying a VLAN 8-34
Deleting a VLAN from the Database 8-34
Assigning Static-Access Ports to a VLAN 8-35
How VLAN Trunks Work 8-36
IEEE 802.1Q Configuration Considerations 8-37
Trunks Interacting with Other Features 8-37
Configuring a Trunk Port 8-38
Disabling a Trunk Port 8-40
Defining the Allowed VLANs on a Trunk 8-40
Changing the Pruning-Eligible List 8-42
Configuring the Native VLAN for Untagged Traffic 8-43
Configuring 802.1p Class of Service 8-44
How Class ofService Works 8-44
PortPriority 8-44
PortScheduling 8-45
Configuring the CoS Port Priorities 8-46

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Contents
Load Sharing Using STP 8-46
Load Sharing Using STP Port Priorities 8-47
Configuring STP PortPriorities and Load Sharing 8-48
Load Sharing Using STP Path Cost 8-50
How the VMPS Works 8-52
Dynamic Port VLAN Membership 8-53
VMPS Database Configuration File 8-54
VMPS Configuration Guidelines 8-56
Default VMPS Configuration 8-57
Configuring Dynamic VLAN Membership 8-57
Configuring Dynamic Ports on VMPS Clients 8-58
Reconfirming VLAN Memberships 8-59
Changing the Reconfirmation Interval 8-59
Changing the Retry Count 8-60
Administering and Monitoring the VMPS 8-60
Troubleshooting Dynamic Port VLAN Membership 8-61
Dynamic Port VLAN Membership Configuration Example 8-61
CHAPTER 9Troubleshooting 9-1
Avoiding Configuration Conflicts 9-2
Avoiding Autonegotiation Mismatches 9-3
Troubleshooting LRE Port Configuration 9-4
Troubleshooting CMS Sessions 9-5
Determining Why a Switch Is Not Added to a Cluster 9-8
Copying Configuration Files to Troubleshoot Configuration Problems 9-9
Troubleshooting Switch Upgrades 9-10

Contents
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Recovery Procedures 9-13
Recovering from Lost Member Connectivity 9-13
Recovering from a Command Switch Failure 9-14
Replacing a Failed Command Switch with a Cluster Member 9-15
Replacing a Failed Command Switch with Another Switch 9-19
Recovering from a Failed Command Switch WithoutHSRP 9-22
Recovering from a Lost or Forgotten Password 9-22
Recovering from Corrupted Software 9-25
APPENDIX ASystem Error Messages A-1
How to Read System Error Messages A-2
Error Message Traceback Reports A-4
Error Message and Recovery Procedures A-5
Chassis Message A-5
CMP Messages A-5
Environment Messages A-6
GigaStack Messages A-7
Link Message A-8
LRE Link Messages A-8
Module Message A-9
PortSecurity Messages A-9
RTD Messages A-10
Storm Control Messages A-11
INDEX

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Preface
Audience
The Catalyst 2900 Series XL and Catalyst 3500 Series XL Software
Configuration Guide is for the network manager responsible for configuring the
Catalyst 2900 series XL and Catalyst 3500 series XL switches, hereafter referred
to as the switches. Before using this guide, you should be familiar with the
concepts and terminology of Ethernet and local area networking.
Purpose
This guide provides information about configuring and troubleshooting a switch
or switch clusters. This guide also provides information about configuring the
Cisco 575 Long-Reach Ethernet (LRE) customer premises equipment (CPE). It
includes descriptions of the management interface options and the features
supported by the switch software.
Use this guide in conjunction with other documents for the following topics:
•Requirements—This guide assumes you have met the hardware and software
requirements and cluster compatibility requirements, as described in the
release notes.
•Start up information—This guide assumes you have assigned switch IP
information and passwords by using the setup program, which is described in
the release notes.

Preface
Purpose
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•Cluster Management Suite (CMS) information—This guide provides an
overview of the CMS web-based, switch management interface. For
information about CMS requirements and the procedures for browser and
plug-in configuration and accessing CMS, refer to the release notes. For CMS
field-level window descriptions and procedures, refer to the CMS online
help.
•Cluster configuration—This guide provides information about planning for,
creating, and maintaining switch clusters. Because configuring switch
clusters is most easily performed through CMS, this guide does not provide
the command-line interface (CLI) procedures. For the cluster commands,
refer to the Catalyst 2900 Series XL and Catalyst 3500 Series XL Command
Reference.
•CLI command information—This guide provides an overview for using the
CLI. For complete syntax and usage information about the commands that
have been specifically created or changed for the Catalyst 2900 XL or
Catalyst 3500 XL switches, refer to the Catalyst 2900 Series XL and
Catalyst 3500 Series XL Command Reference.
Note This guide does not repeat the concepts and CLI procedures provided
in the standard Cisco IOS Release 12.0 documentation. For switch
features that use standard Cisco IOS Release 12.0 commands, refer to
the Cisco IOS Release 12.0 documentation on Cisco.com for
additional information and CLI procedures.

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Preface Organization
Organization
The organization of this guide is as follows:
Chapter 1, “Overview,”lists the software features of this release and provides
examples of how the switch can be deployed in a network.
Chapter 2, “Getting Started with CMS,”describes the Cluster Management Suite
(CMS) web-based, switch management interface. Refer to the release notes for
the procedures for configuring your web browser and accessing CMS. Refer to the
online help for field-level descriptions of all CMS windows and procedures for
using the CMS windows.
Chapter 3, “Getting Started with the CLI,”describes the basics for using the Cisco
IOS CLI.
Chapter 4, “General Switch Administration,”includes the switch-configuration
default settings and information about software releases, accessing the
management interfaces, and using Simple Network Management Protocol
(SNMP).
Chapter 5, “Clustering Switches,”describes switch clusters and the
considerations for creating and maintaining them. The online help provides the
CMS procedures for configuring switch clusters. Cluster commands are described
in the Catalyst 2900 Series XL and Catalyst 3500 Series XL Command Reference.
Chapter 6, “Configuring the System,”provides the considerations and CLI
procedures for configuring switch-wide settings. The online help provides the
CMS procedures for configuring switch-wide settings.
Chapter 7, “Configuring the Switch Ports,”provides the considerations and CLI
procedures for configuring the switch ports. The online help provides the CMS
procedures for configuring the switch ports.
Chapter 8, “Configuring VLANs,”provides the considerations and CLI
procedures for configuring VLANs. The online help provides the CMS
procedures for configuring VLANs.
Chapter 9, “Troubleshooting,”provides information about avoiding and resolving
problems that might arise when you configure and maintain the switch.
Appendix A, “System Error Messages,”lists the IOS system error messages for
the switch.

Preface
Conventions
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Conventions
This guide uses the following conventions to convey instructions and
information:
Command descriptions use these conventions:
•Commands and keywords are in boldface text.
•Arguments for which you supply values are in italic.
•Square brackets ([ ]) indicate optional elements.
•Braces ({ }) group required choices, and vertical bars ( | ) separate the
alternative elements.
•Braces and vertical bars within square brackets ([{ | }]) indicate a required
choice within an optional element.
Interactive examples use these conventions:
•Terminal sessions and system displays are in screen font.
•Information you enter is in boldface screen font.
•Nonprinting characters, such as passwords or tabs, are in angle brackets (< >).
Notes, cautions, and tips use the following conventions and symbols:
Note Means reader take note. Notes contain helpful suggestions or references to
materials not contained in this manual.
Caution Means reader be careful. In this situation, you might do something that could
result in equipment damage or loss of data.
Tips Means the following will help you solve a problem. The tips information might
not be troubleshooting or even an action, but could be useful information.

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Preface Related Publications
Related Publications
You can order printed copies of documents with a DOC-xxxxxx= number. See the
“Ordering Documentation”section on page xxi.
The following publications provide more information about the switches:
•Release Notes for the Catalyst 2900 Series XL and Catalyst 3500 Series XL
Cisco IOS Release 12.0(5)WC(1) (not orderable but is available on
Cisco.com)
•Cluster Management Suite (CMS) online help
•Catalyst 2900 XL and Catalyst 3500 XL Documentation CD (not orderable)
Note This product-specific CD contains only the Catalyst 2900 XL and
Catalyst 3500 XL switch documents and related hardware documents.
This CD is not the same as the Cisco Documentation CD-ROM,which
contains the documentation for all Cisco products and is shipped with
all Cisco products.
The Catalyst 2900 XL and Catalyst 3500 XL Documentation CD is shipped
with the switch and has the following publications:
– This Catalyst 2900 Series XL and Catalyst 3500 Series XL Software
Configuration Guide, Cisco IOS Release 12.0(5)WC(1)
(order number DOC-786511=)
– Catalyst 2900 Series XL and Catalyst 3500 Series XL Command
Reference, Cisco IOS Release 12.0(5)WC(1)
(order number DOC-7812155=)
– Catalyst 2900 Series XL Hardware Installation Guide
(order number DOC-786461=)
– Catalyst 3500 Series XL Hardware Installation Guide
(order number DOC-786456=)
– Catalyst 2900 Series XL Modules Installation Guide
(order number DOC-CAT2900-IG=)
– Catalyst 2900 Series XL ATM Modules Installation and Configuration
Guide (order number DOC-785472=)

Preface
Obtaining Documentation
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– 1000BASE-T Gigabit Interface Converter Installation Note
(not orderable but is available on Cisco.com)
– Catalyst GigaStack Gigabit Interface Converter Hardware Installation
Guide (order number DOC-786460=)
– Cisco 575 LRE CPE Hardware Installation Guide
(order number DOC-7811469=)
Obtaining Documentation
The following sections provide sources for obtaining documentation from Cisco
Systems.
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at
the following sites:
•http://www.cisco.com
•http://www-china.cisco.com
•http://www-europe.cisco.com
Cisco Documentation CD-ROM
Cisco documentation and additional literature are available in a CD-ROM
package, which ships with your product. The Cisco Documentation CD-ROM is
updated monthly and may be more current than printed documentation. The
CD-ROM package is available as a single unit or as an annual subscription.
Note This CD contains the documentation for all Cisco products and is
shipped with all Cisco products. This CD is not the same as the
Catalyst 2900 XL and Catalyst 3500 XL Documentation CD, which
contains only the Catalyst 2900 XL and Catalyst 3500 XL switch
documents and related hardware documents.