Spanning-Tree Mst Max-Age - Cisco ME 3400 Command Reference Manual

Chapter 2 Cisco ME 3400 Ethernet Access 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
12.2(25)EX
Usage Guidelines
On the Cisco ME switch, spanning-tree MST configuration is supported only on network node interfaces
(NNIs) or on enhanced network interfaces (ENIs) on which Spanning Tree Protocol (STP) has been
enabled. To set a port as an NNI or ENI, enter the port-type {eni | nni} interface configuration
command. To enable STP on an ENI, enter the spanning-tree interface configuration command.
User network interfaces (UNIs) do not participate in STP.
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.
OL-9640-10
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.
Cisco ME 3400 Ethernet Access Switch Command Reference
spanning-tree mst max-age
2-637