10 On the non-root bridge change the priority to force port 1/0/2 to be the root port.
spanning-tree mst 20 port-priority 64
exit
Using SNMP to Configure MSTP
For instance 2, set the value to 64.
1 Use the objects in dot1qVlanStaticTable (in dot1qVlan in the QBRIDGE-MIB module) to create VLANs
10 and 20.
2 To enable spanning tree globally, set the agentStpAdminMode object in the 200 Series-SWITCHING-
MIB module to enable (2).
The full path to the object is
iso(1).org(3).dod(6).internet(1).private(4).enterprises(1).broadcom(4413).
broadcomProducts(1).fastPath(1).fastPathSwitching(1).agentConfigGroup(2).agentStpSwitchConfig
Group(15).agentStpAdminMode(6).
3 Use the agentStpConfigName object in the agentStpSwitchConfigGroup to change the name so that
all the bridges that want to be part of the same region can form the region.
4 Use the agentStpMstRowStatus object in the agentStpMstTable to create MST instances 10 and 20.
5 Use the agentStpMstBridgePriority object to set the bridge priorities for MST 10 and MST 20:
•
For MST ID 10, set the value to 16384 to make it the root bridge.
•
For MST ID 20, set the value to 61440 to ensure the other bridge is the root bridge.
Configuration Examples
ExtremeSwitching 200 Series: Administration Guide
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