Spanning-Tree Mst Max-Age - Cisco Catalyst 3750 Command Reference Manual

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Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

spanning-tree mst max-age

Use the spanning-tree mst max-age global configuration command on the switch stack or on a

standalone switch to set the interval between messages that the spanning tree receives from the root

switch. If a switch does not receive a bridge protocol data unit (BPDU) message from the root switch

within this interval, it recomputes the spanning-tree topology. Use the no form of this command to return

to the default setting.

Syntax Description

The default is 20 seconds.

Command Modes

Global configuration

Command History

Usage Guidelines

After you set the spanning-tree mst max-age seconds global configuration command, if a switch does

not receive BPDUs from the root switch within the specified interval, the switch recomputes the

spanning-tree topology. The max-age setting must be greater than the hello-time setting.

Changing the spanning-tree mst max-age command affects all spanning-tree instances.

This example shows how to set the spanning-tree max-age to 30 seconds for all multiple spanning-tree

(MST) instances:

Switch(config)# spanning-tree mst max-age 30

You can verify your setting by entering the show spanning-tree mst privileged EXEC command.

spanning-tree mst max-age seconds

no spanning-tree mst max-age

Interval between messages the spanning tree receives from the root switch. The range is

6 to 40 seconds.

Modification

This command was introduced.

spanning-tree mst max-age

Catalyst 3750 Switch Command Reference

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