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Configuring the switch priority, Configuring the hello time – IBM 12.1(22)EA6 User Manual

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Cisco Systems Intelligent Gigabit Ethernet Switch Modules for the IBM BladeCenter, Software Configuration Guide

24R9746

Chapter 10 Configuring MSTP

Configuring MSTP Features

Configuring the Switch Priority

You can configure the switch priority and make it more likely that the switch will be chosen as the root
switch.

Note

Exercise care when using this command. For most situations, we recommend that you use the
spanning-tree mst instance-id root primary and the spanning-tree mst instance-id root secondary
global configuration commands to modify the switch priority.

Beginning in privileged EXEC mode, follow these steps to configure the switch priority. This procedure
is optional.

To return the switch to its default setting, use the no spanning-tree mst instance-id priority global
configuration command.

Configuring the Hello Time

You can configure the interval between the generation of configuration messages by the root switch by
changing the hello time.

Note

Exercise care when using this command. For most situations, we recommend that you use the
spanning-tree mst instance-id root primary and the spanning-tree mst instance-id root secondary
global configuration commands to modify the hello time.

Command

Purpose

Step 1

configure terminal

Enter global configuration mode.

Step 2

spanning-tree mst instance-id priority priority

Configure the switch priority for an MST instance.

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 0 to .

For priority, the range is 0 to 61440 in increments of
4096; the default is 32768. The lower the number, the
more likely the switch will be chosen as the root switch.

Valid priority values are 0, 4096, 8192, 12288, 16384,
20480, 24576, 28672, 32768, 36864, 40960, 45056,
49152, 53248, 57344, and 61440. All other values are
rejected.

Step 3

end

Return to privileged EXEC mode.

Step 4

show spanning-tree mst instance-id

Verify your entries.

Step 5

copy running-config startup-config

(Optional) Save your entries in the configuration file.