Spanning-Tree Mst Max-Age; Spanning-Tree Mst Hello-Time - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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- Command reference manual (662 pages) ,
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Chapter 2 Catalyst 3550 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.
Syntax Description
seconds
Defaults
The default is 20 seconds.
Command Modes
Global configuration
Command History
Release
12.1(9)EA1
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 MST instances:
Switch(config)# spanning-tree mst max-age 30
You can verify your settings 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-8566-01
spanning-tree mst max-age seconds
no spanning-tree mst max-age
Interval between messages the spanning tree receives from the root switch. If a switch
does not receive a BPDU message from the root switch within this interval, it
recomputes the spanning-tree topology. The range is 6 to 40 seconds.
Modification
This command was introduced.
mst
Description
Displays multiple spanning-tree (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 3550 Multilayer Switch Command Reference
spanning-tree mst max-age
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