19-16
Cisco IE 3000 Switch Software Configuration Guide
OL-13018-03
Chapter 19 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. To re-enable PVST+, use the
no spanning-tree mode
or the
spanning-tree
mode pvst
global 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:
Switch(config)#
spanning-tree mst configuration
Switch(config-mst)#
instance 1 vlan 10-20
Switch(config-mst)#
name region1
Switch(config-mst)#
revision 1
Switch(config-mst)#
show pending
Pending MST configuration
Name [region1]
Revision 1
Instance Vlans Mapped
-------- ---------------------
Step 3
instance
instance-id
vlan
vlan-range
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.
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+ or both MSTP and rapid 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