Cisco Systems N3KC3048TP1GE Entering MST Configuration Mode, Switchconfig# spanning-tree mode mst

Configuring Multiple Spanning Tree

Entering MST Configuration Mode

Procedure

	Command or Action	Purpose
Step 1	switch# configure terminal	Enters configuration mode.
Step 2	switch(config)# spanning-tree mode mst	Enables MST on the switch.
Step 3	switch(config)# no spanning-tree mode mst	(Optional)
		Disables MST on the switch and returns you
		to Rapid PVST+.

This example shows how to enable MST on the switch:

switch# configure terminal switch(config)# spanning-tree mode mst

Note Because STP is enabled by default, entering a show running-configcommand to view the resulting configuration does not display the command that you entered to enable STP.

Entering MST Configuration Mode

You enter MST configuration mode to configure the MST name, VLAN-to-instance mapping, and MST revision number on the switch.

For two or more switches to be in the same MST region, they must have the identical MST name,

VLAN-to-instance mapping, and MST revision number.

Note Each command reference line creates its pending regional configuration in MST configuration mode. In addition, the pending region configuration starts with the current region configuration.

When you are working in MST configuration mode, note the difference between the exit and abort commands.

Procedure

	Command or Action	Purpose
Step 1	switch# configure terminal	Enters configuration mode.
Step 2	switch(config)# spanning-tree	Enters MST configuration mode on the system. You must be
	mst configuration	in the MST configuration mode to assign the MST configuration
		parameters, as follows:
		• MST name
		• Instance-to-VLAN mapping
		• MST revision number

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