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STP_span extend system-id(from cisco)

Cisco 林志斌 993浏览

spanning-tree extend system-id

To enable the extended system ID feature on a chassis that supports 1024 MAC addresses, use the spanning-tree extend system-id command. To disable the feature, use the no form of this command.

spanning-tree extend system-id

no spanning-tree extend system-id

Syntax Description

This command has no arguments or keywords.

Defaults

Enabled on systems that do not provide 1024 MAC addresses.

Command Modes

Global configuration

Command History

Release

Modification

12.1(12c)EW

Support for this command was introduced on the Catalyst 4500 series switch.

Usage Guidelines

Releases 12.1(13)E and later support chassis with 64 or 1024 MAC addresses. For chassis with 64 MAC addresses, STP uses the extended system ID plus a MAC address to make the bridge ID unique for each VLAN.

You cannot disable the extended system ID on chassis that support 64 MAC addresses.

Enabling or disabling the extended system ID updates the bridge IDs of all active STP instances, which might change the spanning tree topology.

Examples

This example shows how to enable the extended system ID:

Switch(config)# spanning-tree extend system-id 

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