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Configuring MSTP Features
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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
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
17-16
Partitioning the network into a large number of regions is not recommended. However, if this
situation is unavoidable, we recommend that you partition the switched LAN into smaller LANs
interconnected by routers or non-Layer 2 devices.
For configuration guidelines about UplinkFast and BackboneFast, see the
Configuration Guidelines" section on page
Purpose
Enter global configuration mode.
Enter MST configuration mode.
Map VLANs to an MST instance.
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.
Caution
You cannot run both MSTP and PVST+ or both MSTP and rapid PVST+
at the same time.
18-10.
For instance-id, the range is 0 to 4094.
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For vlan vlan-range, the range is 1 to 4094.
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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.
Changing spanning-tree modes can disrupt traffic because all
spanning-tree instances are stopped for the previous mode and
restarted in the new mode.
Chapter 17
Configuring MSTP
"Optional Spanning-Tree
OL-8915-03
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