Specifying The Mst Region Configuration And Enabling Mstp - Cisco Catalyst 2360 Software Configuration Manual

Configuring MSTP Features

Specifying the MST Region Configuration and Enabling MSTP

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 name.
A region can have one member or multiple members with the same MST configuration; each member
must be capable of processing RSTP BPDUs. There is no limit to the number of MST regions in a
network, but each region can only support up to 65 spanning-tree instances. You can assign a VLAN to
only one spanning-tree instance at a time.
Beginning in privileged EXEC mode, follow these steps to specify the MST region configuration and
enable MSTP. This procedure is required.
Command
Step 1
configure terminal
Step 2 spanning-tree mst configuration
Step 3 instance instance-id vlan vlan-range
Step 4 name name
Step 5 revision version
Step 6 show pending
Step 7
exit
Step 8
spanning-tree mode mst
Step 9 end
Step 10
show running-config
Step 11
copy running-config startup-config
Catalyst 2360 Switch Software Configuration Guide
12-16
Purpose
Enter global configuration mode.
Enter MST configuration mode.
Map VLANs to an MST instance.
For instance-id, the range is 0 to 4094.
•
For vlan vlan-range, the range is 1 to 4094.
•
When you map VLANs to an MST instance, the mapping is
incremental, and the VLANs specified in the command are added to
or removed from the VLANs that were previously mapped.
To specify a VLAN range, use a hyphen; for example, instance 1 vlan
1-63 maps VLANs 1 through 63 to MST instance 1.
To specify a VLAN series, use a comma; for example, instance 1 vlan 10,
20, 30 maps VLANs 10, 20, and 30 to MST instance 1.
Specify the configuration name. The name string has a maximum length
of 32 characters and is case sensitive.
Specify the configuration revision number. The range is 0 to 65535.
Verify your configuration by displaying the pending configuration.
Apply all changes, and return to global configuration mode.
Enable MSTP. RSTP is also enabled.
Changing spanning-tree modes can disrupt traffic because all
Caution
spanning-tree instances are stopped for the previous mode and
restarted in the new mode.
You cannot run both MSTP and PVST+ or both MSTP and rapid PVST+
at the same time.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 12 Configuring MSTP
OL-19808-01