IEEE 802.1D Bridging

• Most important counters deal with knowing stability of topology. RFC 1493 defines the following for Spanning Tree Protocol (STP):

  • dot1dStpTopChanges
    • Number of times Spanning Tree recalculated topology
  • dot1dStpTimeSinceTopologyChange
    • Indicates how long bridged network has been stable
  • dot1dStpDesignatedRoot
    • mac addr of root bridge - should track this
  • dot1dStpRootPort
    • The port by which the root bridge is reached

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