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Cisco ME 3800X and ME 3600X Switch Command Reference
OL-28238-01
Chapter
spanning-tree mst max-age
spanning-tree mst max-age
To set the interval between messages that the spanning tree receives from the root switch, use the
spanning-tree mst max-age command in global configuration mode. 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. To return to the default setting, use the no form of this command.
spanning-tree mst max-age seconds
no spanning-tree mst max-age
Syntax Description
Defaults 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.
You can verify your setting by entering the show spanning-tree mst privileged EXEC command.
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
Related Commands
seconds Interval between messages the spanning tree receives from the root switch. The range is
6 to 40 seconds.
Release Modification
12.2(52)EY This command was introduced.
Command Description
show spanning-tree mst Displays MST information.
spanning-tree mst forward-time Sets the forward-delay time for all MST instances.
spanning-tree mst hello-time Sets the interval between hello BPDUs sent by root switch
configuration messages.
spanning-tree mst max-hops Sets the number of hops in a region before the BPDU is
discarded.
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