Spanning-Tree Mst Hello-Time - Cisco ME 3400 Command Reference Manual

Ethernet access switch

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Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands

spanning-tree mst hello-time

Use the spanning-tree mst hello-time global configuration command to set the interval between hello

bridge protocol data units (BPDUs) sent by root switch configuration messages. Use the no form of this

command to return to the default setting.

Syntax Description

The default is 2 seconds.

Command Modes

Global configuration

Command History

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 hello-time command affects all spanning-tree instances.

This example shows how to set the spanning-tree hello time to 3 seconds for all multiple spanning-tree

(MST) instances:

Switch(config)# spanning-tree mst hello-time 3

You can verify your setting by entering the show spanning-tree mst privileged EXEC command.

spanning-tree mst hello-time seconds

no spanning-tree mst hello-time

Interval between hello BPDUs sent by root switch configuration messages. The

range is 1 to 10 seconds.

Modification

This command was introduced.

Cisco ME 3400 Ethernet Access Switch Command Reference

spanning-tree mst hello-time