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3-40

Multiple Instance Spanning-Tree Operation

Configuring MSTP

Syntax: spanning-tree instance < 1..16 >< port-list > priority <priority-multiplier>

This command sets the priority for the specified port(s) in the

specified MST instance. (For a given port, the priority setting

can be different for different MST instances to which the port

may belong.) The priority range for a port in a given MST

instance is 0-255. However, this command specifies the

priority as a multiplier (0 - 15 ) of 16. That is, when you

specify a priority multiplier of 0 - 15, the actual priority

assigned to the switch is:

(priority-multiplier) x 16

For example, if you configure “2” as the priority multiplier on

a given port in an MST instance, then the actual Priority setting

is 32. Thus, after you specify the port priority multiplier in

an instance, the switch displays the actual port priority (and

not the multiplier) in the show spanning-tree instance < 1..16 >

or show spanning-tree < port-list > instance < 1..16 > displays.

You can view the actual multiplier setting for ports in the

specified instance by executing show running and looking for

an entry in this format:

spanning-tree instance < 1..15 > < port-list > priority < priority-

multiplier >

For example, configuring port A2 with a priority multiplier

of “3” in instance 1, results in this line in the show running

output:

spanning-tree instance 1 A2 priority 3

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