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Multiple Instance Spanning-Tree Operation

Configuring MSTP

Configuring MST Instance Per-Port Parameters

Command Page

spanning-tree instance < 1..16 > < port-list > path-cost

< auto | 1..200000000 >

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spanning-tree instance < 1..16 > < port-list > priority < priority-multiplier >3-40

spanning-tree < port-list > priority < priority-multiplier >3-41

Syntax: spanning-tree instance < 1..16 > < port-list > path-cost < auto | 1..200000000 >

This command assigns an individual port cost for the specified

MST instance. (For a given port, the path cost setting can be

different for different MST instances to which the port may

belong.) The switch uses the path cost to determine which ports

are the forwarding ports in the instance; that is which links to

use for the active topology of the instance and which ports to

block. The settings are either auto or in a range from 1 to

200,000,000. With the auto setting, the switch calculates the

path cost from the link speed:

10 Mbps — 2000000

100 Mbps — 200000

1 Gbps — 20000

(Default: Auto)

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