Specifications

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Software Configuration Guide, Cisco IOS Release 15.1(3)MR
OL-26895-01
Chapter 10 Configuring MSTP
Configuring MSTP Features
To return to the default MST region configuration, use the no spanning-tree mst configuration global
configuration command. To return to the default VLAN-to-instance map, use the no instance
instance-id [vlan vlan-range] MST configuration command. To return to the default name, use the no
name MST configuration command. To return to the default revision number, use the no revision MST
configuration command.
This example shows how to enter MST configuration mode, map VLANs 10 to 20 to MST instance 1,
name the region region1, set the configuration revision to 1, display the pending configuration, apply
the changes, and return to global configuration mode:
Router(config)# spanning-tree mst configuration
Router(config-mst)# instance 1 vlan 10-20
Router(config-mst)# name region1
Router(config-mst)# revision 1
Router(config-mst)# show pending
Pending MST configuration
Name [region1]
Revision 1
Instances configured 2
Instance Vlans Mapped
-------- ---------------------
0 1-9,21-4094
1 10-20
-------------------------------
Router(config-mst)# exit
Router(config)#
Configuring the Router as a Root Switch
The router maintains a spanning-tree instance for the group of VLANs mapped to it. A bridge ID,
consisting of the switch priority and the switch MAC address, is associated with each instance. For a
group of VLANs, the switch with the lowest bridge ID becomes the root switch.
Step 4
name name Specify the configuration name. The name string has a maximum length
of 32 characters and is case sensitive.
Step 5
revision version Specify the configuration revision number. The range is 0 to 65535.
Step 6
show pending Verify your configuration by displaying the pending configuration.
Step 7
exit Apply all changes, and return to global configuration mode.
Step 8
spanning-tree mode mst Enable MSTP. RSTP is also enabled.
Caution Changing spanning-tree modes can disrupt traffic because all
spanning-tree instances are stopped for the previous mode and
restarted in the new mode.
You cannot run both MSTP and PVST+ at the same time.
Step 9
end Return to privileged EXEC mode.
Step 10
show running-config Verify your entries.
Step 11
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose