Spanning-Tree Mst Max-Age - Cisco Catalyst 3560X-24P Command Reference Manual

Chapter 2 Catalyst 3750-X and 3560-X 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 seconds
Defaults The default is 20 seconds.
Command Modes
Global configuration
Command History Release
12.2(53)SE2
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.
Examples 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.
Related Commands Command
show spanning-tree
spanning-tree mst forward-time
spanning-tree mst hello-time
spanning-tree mst max-hops
OL-21522-02
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.
mst
Description
Displays MST information.
Sets the forward-delay time for all MST instances.
Sets the interval between hello BPDUs sent by root switch
configuration messages.
Sets the number of hops in a region before the BPDU is
discarded.
Catalyst 3750-X and 3560-X Switch Command Reference
spanning-tree mst max-age
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