Cisco Systems 3560 Manual De Usuario
18-16
Catalyst 3560 Switch Software Configuration Guide
OL-8553-06
Chapter 18 Configuring MSTP
Configuring MSTP Features
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For configuration guidelines about UplinkFast and BackboneFast, see the
.
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.
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.
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.
enable MSTP. This procedure is required.
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
spanning-tree mst configuration
Enter MST configuration mode.
Step 3
instance instance-id vlan vlan-range
Map VLANs to an MST instance.
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For instance-id, the range is 0 to 4094.
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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.
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.
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.
10, 20, 30 maps VLANs 10, 20, and 30 to MST instance 1.
Step 4
name name
Specify the configuration name. The name string has a maximum length
of 32 characters and is case sensitive.
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.
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.
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.