Cisco WS-C3560E-24PD-E Command Reference - Page 618
spanning-tree mst max-age
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spanning-tree mst max-age Chapter 2 Catalyst 3560 Switch Cisco IOS Commands spanning-tree mst max-age Use the spanning-tree mst max-age global configuration command 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. spanning-tree mst max-age seconds no spanning-tree mst max-age Syntax Description seconds Interval between messages the spanning tree receives from the root switch. The range is 6 to 40 seconds. Defaults The default is 20 seconds. Command Modes Global configuration Command History Release 12.1(19)EA1 Modification This command was introduced. 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 mst spanning-tree mst forward-time spanning-tree mst hello-time spanning-tree mst max-hops 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. 2-586 Catalyst 3560 Switch Command Reference 78-16405-05