Introduction - Allied Telesis SwitchBlade x908 Series Software Reference Manual

awplus(config-mst)#
awplus(config-mst)#
awplus(config-mst)#
Associate switch ports with each instance
awplus(config-mst)#
awplus(config-if)#
Advanced configuration
The commands above are the minimum required to configure MSTP. The following commands allow more advanced
configuration.
Assign root bridge priorities
MSTP lets you distribute traffic more efficiently across a network by blocking different links for different VLANs. You
do this by making different devices into the root bridge for each MSTP instance, and for the CIST, so that each
instance blocks a different link. By default, all devices have the same root bridge priority, 32768 (8000 in hexadecimal),
so the device with the lowest MAC address becomes the root bridge. If you want the device to be the root bridge for
an instance or for the CIST, set the priority to a lower value (a higher priority) than other devices for this instance. (If
you enter a number that is not a multiple of 4096, the device rounds the number down.)
awplus(config-if)#
awplus(config-mst)#
awplus(config-mst)#
awplus(config)#
Configure edge ports
If some switch ports are connected to devices that cannot generate BPDUs (such as workstations), you can set
particular switch ports as edge ports, or set them to automatically detect whether they are edge ports.
awplus(config-if)#
awplus(config-if)#
awplus(config-if)#
Configure Root Guard
C613-50007-01 REV B
Command
region <region-name>
revision <revision-number>
instance <msti-id> vlan {<vid>|<vid-
list>}
interface <port-list>
spanning-tree mst instance
<instance-id>
spanning-tree mst configuration
instance <msti-id> priority
<priority>
exit
spanning-tree priority <priority>
interface <port-list>
spanning-tree edgeport
or
spanning-tree autoedge
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
Spanning Tree Introduction: STP, RSTP, and MSTP
Description
Specify the MSTP region. The region is an
arbitrary string that specifies the name you want to
assign to the MST region for identification.
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.
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.
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.
Enter MST Configuration mode.
Set the priority for the device to become the root
bridge for each instance.
Return to Global Configuration mode.
Set the priority for the device to become the root
bridge for the CIST.
Enter Interface Configuration mode for these
switch ports.
Set these ports to be edge ports,
or
to automatically detect whether they are edge
ports.
18.19