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Catalyst 3560 Switch Command Reference
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Chapter 2 Catalyst 3560 Switch Cisco IOS Commands
spanning-tree mst max-age
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
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.
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
seconds
Interval between messages the spanning tree receives from the root switch. The range
is 6 to 40 seconds.
Release
Modification
12.1(19)EA1
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.