when any of the general events like protocol up or 
protocol down occurs

when the ports Loop-protect state (no-error or loop-prevented) 
for CIST changes.

when the ports Loop-protect state (no-error or loop-prevented) 
an MSTI changes.

when any of the error events like memory failure or buffer failure
or protocol migration or new root or topology change occurs

whenever a new root bridge is selected in the topology. 
The jnxMIMstNewRootTrap indicates that the sending agent has become 
the new root of the Spanning Tree; the trap is sent by a bridge soon 
after its election as the new root

Generated when topology change is detected

Generated when port protocol migration happens in the port

when the invalid packet is received for 
bpdu/stp/rstp/maximum age/forward delay/hello time

when the MST region's configuration     
identifier changes.

when the ports Root-protect state (no-error or root-prevented) 
for CIST changes.

when the ports Root-protect state (no-error or root-prevented) 
an MSTI changes.