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Performance and Fault Management by James M. Thompson, Kent J. Phelps, Robert L. Pavone, Christopher E. Elliott, Paul L. Della Maggiora

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Error/Fault Data for VLANs

When troubleshooting VLANs, the most common and most difficult issue to deal with is the constant changing of the spanning tree topology for each VLAN. Each VLAN has its own instance of spanning tree running. In this section, we'll identify how to monitor and keep track of the spanning tree topology changes in each VLAN.

MIBs to Monitor for Spanning Tree Topology Changes

The following MIBs, from BRIDGE-MIB, keep track of the spanning tree topology in the network:

  • dot1dStpTimeSinceTopologyChange

  • dot1dStpTopChanges

  • dot1dStpDesignatedRoot

  • dot1dStpPortState

A unique aspect of VLANs is that each one has its own instance of spanning tree. So, how can you tell which VLAN is changing spanning tree topology? Well, this is where ...

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