Spanning Tree Introduction: STP, RSTP, MSTP
©2008 Allied Telesis Inc. All rights reserved.
Software Version 5.2.1
AlliedWare Plus
TM
Operating System Software Reference C613-50003-00 REV E
18.19
Table 18-9: Configuration procedure for MSTP
Command
Description
Enable MSTP
awplus#
configure terminal
Enter Configuration mode.
awplus(config)#
spanning-tree mode
mstp
By default, the device is in RSTP mode. Change to
MSTP mode.
awplus(config)#
spanning-tree {stp|rstp|mstp} enable
By default, spanning tree is enabled on all switch
ports. If it has been disabled, enable it for MSTP.
Configure MSTP region, revision, and instances
All MSTP devices in this region of the network must have the same region name, revision number, and VLAN to MSTI
mappings.
awplus(config)#
spanning-tree mst configuration
Enter MST Configuration mode.
awplus(config-mst)#
region <region-name>
Specify the MSTP region. The
region
is an arbitrary
string that specifies the name you want to assign to
the MST region for identification.
awplus(config-mst)#
revision <revision-number>
Specify the MSTP revision number <0-255>. The
revision
parameter specifies the revision of the
current MST configuration. The revision is an
arbitrary number that you assign to an MST region.
It can be used to keep track of the number of
times that MST configuration has been updated for
the network.
awplus(config-mst)#
instance <msti-id> vlan {<vid>|<vid-
list>}
To allow MSTP to block traffic for different VLANs
in different places in a loop, create multiple MSTP
instances and associate VLANs with them. Each
VLAN can only be in one instance.
Associate switch ports with each instance
awplus(config-mst)#
interface
<port-list>
Enter Interface Configuration mode for the switch
ports or channel groups to be associated with a
particular instance.
Attach the instance to these ports.
Repeat for each instance.
awplus(config-if)#
spanning-tree mst instance
<instance-id>
Advanced configuration
The commands above are the minimum required to configure MSTP. The following commands allow more advanced
configuration.