A topologyChange trap is sent by a bridge when any of its configured ports transitions from the Learning state to the Forwarding state, or from the Forwarding state to the Blocking state. The trap is not sent if a newRoot trap is sent for the same transition. Implementation of this trap is optional.
1.3.6.1.2.1.17.0.2
Trap : topologyChange
Objects : { extremeStpDomainStpdInstance }
OID : "1.3.6.1.2.1.17.0.2"
object : extremeStpDomainStpdInstance type : Integer32