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Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide

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Chapter 5 Clustering Switches

Planning a Switch Cluster

Management VLAN

Communication with the switch management interfaces is through the command-switch IP address. The

IP address is associated with the management VLAN, which by default is VLAN 1. To manage switches

in a cluster, the command switch, member switches, and candidate switches must be connected through

ports that belong to the command-switch management VLAN.

Caution You can change the management VLAN through a console connection without interrupting the

console connection. However, changing the management VLAN ends your CMS session. Restart

your CMS session by entering the new IP address in the browser Location field (Netscape

Communicator) or Address field (Microsoft Internet Explorer), as described in the release notes

(http://www.cisco.com/univercd/cc/td/doc/product/lan/c2900xl/index.htm).

You can change the management VLAN of a member switch (not the command switch); however, the

command switch will not be able to communicate with it. In this case, you will need to manage the switch

as a standalone switch.

You can globally change the management VLAN for the cluster as long as each member switch has either

a trunk connection or connection to the new command-switch management VLAN. Use the cluster

management vlan global configuration command from the command switch to change the current

management VLAN of the cluster to a different management VLAN.

Note Activity synchronization is only valid if your command switch and member switches are running IOS

Release 12.0(5)XU and later. Earlier releases of the software require that switches be upgraded one

at a time.

Note If your cluster includes members that are running a software release earlier than Cisco IOS

Release 12.0(5)XP, you cannot change the management VLAN of the cluster. If your cluster includes

member switches that are running Cisco IOS Release 12.0(5)XP, those members need to have the

VLAN changed before using the Management VLAN window.

If you add a new switch to an existing cluster and the cluster is using a management VLAN other than

the default VLAN 1, the command switch automatically senses that the new switch has a different

management VLAN and has not been configured. The command switch issues commands to change the

management VLAN of the new switch to match the one in use by the cluster. This automatic change of

the VLAN only occurs for new, out-of-box switches that do not have a config.text file and for which

there have been no changes to the running configuration.

For more information about changing the management VLAN, see the “Changing the Management

VLAN for a New Switch” section on page 8-4.

Network Port

A network port cannot link cluster members. For more information about the network port, see the

“Enabling a Network Port” section on page 7-6.

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Cisco Catalyst 2900 Series XL Spezifikationen Seite 110