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Multiple Instance Spanning-Tree Operation
Configuring MSTP
3. Configure MST instances.
• Configure one instance for each VLAN group that you want to operate
as an active topology within the region to which the switch belongs.
When you create the instance, you must include a minimum of one
VID. You can add more VIDs later if desired.
spanning-tree instance < n > vlan < vid >
To move a VLAN from one instance to another, first use no spanning-
tree instance < n > vlan < vid > to unmap the VLAN from the current
instance, then add the VLAN to the other instance. (While the VLAN
is unmapped from an MSTI, it is associated with the region’s IST
instance.)
4. Configure the priority for each instance.
spanning-tree instance < n > priority < n >
5. Configure MST instance port parameters.
ProCurve recommends that you apply changes on a per-port basis only
where a non-default setting is clearly indicated by the circumstances of
individual links. For example, you might want to set the path cost value
for the port(s) used by a specific MST instance.
spanning-tree instance < 1..16 >< port-list > path-cost < auto | 1..200000000 >
Alternatively, leaving this setting at the default (auto) allows the switch
to calculate the path-cost from the link speed.
6. Enable spanning-tree operation on the switch.
spanning-tree
For an example of a complete MSTP network configuration:
• Go to the ProCurve Web site at www.procurve.com/support.
•Click on Configuration examples.
• Click on ProCurve Switch 8212zl (the 6120 switches work like the 8212zl
in this regard).
•Under STP Example, click on ProCurve & Cisco Spanning Tree Interoper-
ability.