Cisco Systems N3KC3048TP1GE Specifying the MST Configuration Revision Number, Procedure, Purpose

Configuring Multiple Spanning Tree

Specifying the MST Configuration Revision Number

Specifying the MST Configuration Revision Number

You configure the revision number on the bridge. For two or more bridges to be in the same MST region, they must have the identical MST name, VLAN-to-instance mapping, and MST revision number.

Procedure

	Command or Action	Purpose
Step 1	switch# configure terminal	Enters configuration mode.
Step 2	switch(config)# spanning-tree mst	Enters MST configuration submode.
	configuration
Step 3	switch(config-mst)# revision version	Specifies the revision number for the MST region.
		The range is from 0 to 65535, and the default
		value is 0.

This example shows how to configure the revision number of the MSTI region for 5:

switch# configure terminal

switch(config)# spanning-tree mst configuration switch(config-mst)# revision 5

Specifying the Configuration on an MST Region

For two or more switches to be in the same MST region, they must have the same VLAN-to-instance mapping, the same configuration revision number, and the same MST name.

A region can have one member or multiple members with the same MST configuration; each member must be capable of processing IEEE 802.1w RSTP BPDUs. There is no limit to the number of MST regions in a network, but each region can support only up to 65 MST instances. You can assign a VLAN to only one MST instance at a time.

Procedure

	Command or Action	Purpose
Step 1	switch# configure terminal	Enters configuration mode.
Step 2	switch(config)# spanning-tree	Enters MST configuration submode.
	mst configuration
Step 3	switch(config-mst)# instance	Maps VLANs to an MST instance as follows:
	instance-id vlan vlan-range	• For	instance-id , the range is from 1 to 4094.
		• For	vlan vlan-range , the range is from 1 to 4094.

	Cisco Nexus 3000 NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U3(1)
100	OL-26590-01