Configuring The Switch Priority - Cisco nexus 5000 series Configuration Manual

Configuring the Switch Priority

Command or Action
This example shows how to set the MST interface port cost on Ethernet 3/1 for MSTI 4:
switch# configure terminal
switch(config)# interface ethernet 3/1
switch(config-if)# spanning-tree mst 4 cost 17031970
Configuring the Switch Priority
You can configure the switch priority for an MST instance so that it is more likely that the specified switch
is chosen as the root bridge.
Exercise care when using this command. For most situations, we recommend that you enter the
Note
spanning-tree mst root primary and the spanning-tree mst root secondary global configuration
commands to modify the switch priority.
SUMMARY STEPS
1. switch# configure terminal
2. switch(config)# spanning-tree mst instance-id priority priority-value
DETAILED STEPS
Command or Action
Step 1 switch# configure terminal
Step 2 switch(config)# spanning-tree mst
instance-id priority priority-value
Cisco Nexus 5000 Series NX-OS Layer 2 Switching Configuration Guide, Release 5.1(3)N1(1)
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Purpose
If a loop occurs, MST uses the path cost when selecting an interface to place
into the forwarding state. A lower path cost represents higher-speed
transmission as follows:
• 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.
• For cost, the range is from 1 to 200000000. The default value is auto,
which is derived from the media speed of the interface.
Purpose
Enters global configuration mode.
Configures a switch priority as follows:
• 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.
Configuring Multiple Spanning Tree
OL-25842-01