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5-9
Spanning Tree Protocols
5.5.4 Make VLAN to MSTP Instance Assignments
MSTP spanning tree instances are identified by number, an integer between 2 and 64. Each VLAN can
belong to exactly one MSTP instance. MSTP instances are created simply by assigning a VLAN to that
instance number. To assign a VLAN to an MSTP instance, go to the MSTP Instance Configuration page
(Spanning Tree > MSTP Config. > MSTP Instance Config.), enter the MSTP Instance ID number and
the VLAN ID number in the top section and click on that section's Apply button. That VLAN will now
be spanned in that MSTP spanning tree instance and the association between the VLAN and the
MSTP instance will be displayed in the bottom half of this screen. The VLAN to MSTP Instance
mappings can be deleted using the buttons in this table - Remove Instance and Remove VLAN.
5.5.5 Optional - Set Port Characteristics for MSTP Instances
The port characteristics that used by the spanning tree algorithm, Priority, Cost, and STP Status, and
which were discussed in
Set the Port Characteristics on page
5-8, can also be set on a per-MSTP-
instance basis.
To set these for a particular MSTP instance, go to the MSTP Instance Configuration page (Spanning
Tree > MSTP Config. > MSTP Instance Config.), and enter the MSTP instance number below the
heading "MST Instance Port Config" and click on the Apply button to the right. A new screen will
display titled MST Instance Port Configuration which will allow configuration of these parameters in
exactly the same was as they were configured in
Set the Port Characteristics on page
5-8.
The switch's priority as used for selection of the root switch within a spanning tree may also be set
for any particular MSTP spanning tree instance. Go to the MSTP Instance Configuration page
(Spanning Tree > MSTP Config. > MSTP Instance Config.), and enter the MSTP instance number below
the heading "MST Instance Port Config" and click on the Apply button to the right. A new screen will
display titled MST Instance Configuration. Use the drop down menu to set the MSTI Bridge Priority.
It will default to 8000. A lower numeric value will increase the likelihood that this switch is selected
as the root switch for this MSTP spanning tree instance.
5.6 Displaying MST Spanning Tree Instance Status
The roles of each port in a MSTP spanning tree instance can be displayed. Go to the MSTP Instance
Configuration page (Spanning Tree > MSTP Config. > MSTP Instance Config.), and enter the MSTP
instance number below the heading "MST Instance Topology Info" and click on the Apply button to
the right. A new screen will display with the heading MST Instance Topology Information. Each of the
ports will be listed as well as the roles it plays in the specified MSTP instance.
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