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Monitoring: Spanning Tree state through SNMP

Within our network all switches use Spanning-Tree in orde to provide failover would a switch failure occur. Although we monitor each switch separately i always had the need to monitor the STP port states and see if one of the ports/trunks did a failover (and then, why).

After searching for a while i tried using SNMP to find the state and found it;
..1.3.6.1.2.1.17.2.15.1.3

1 = Forwarding (active)
2 = Blocking (ment for failover)

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