User's Manual

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Table Of Contents

PurposeCommand or Action

•

For instance-id, you can specify a single instance, a range

of instances separated by a hyphen, or a series of instances

separated by a comma. The range is from 1 to 4094.

secondary} [diameter dia

[hello-time hello-time]]

•

For diameter net-diameter, specify the maximum number

of hops between any two end stations. The default is 7.

This keyword is available only for MST instance 0.

•

For hello-time seconds, specify the interval in seconds

between the generation of configuration messages by the

root bridge. The range is from 1 to 10 seconds; the default

is 2 seconds.

(Optional)

Returns the switch priority, diameter, and hello time to default

values.

switch(config)# no spanning-tree

mst instance-id root

Step 3

This example shows how to configure the switch as the root switch for MSTI 5:

switch# configure terminal

switch(config)# spanning-tree mst 5 root primary

Configuring a Secondary Root Bridge

You can execute this command on more than one switch to configure multiple backup root bridges. Enter the

same network diameter and hello-time values that you used when you configured the primary root bridge with

the spanning-tree mst root primary configuration command.

Procedure

PurposeCommand or Action

Enters configuration mode.switch# configure terminal

Step 1

Configures a switch as the secondary root bridge as follows:switch(config)# spanning-tree

mst instance-id root {primary |

Step 2

•