The SNMP trap that is generated when a port turns into
forwarding state form other state.

The SNMP trap is generated when an edge port
receives a BPDU packet, and the port is no longer an edge port.

The SNMP trap is generated when a port received a BPDU after the
number of TC BPDUs received by an instance exceeded the threshold.

The SNMP trap is generated when a port received a BPDU after the
number of TC BPDUs received by an instance exceeded the threshold.

The SNMP trap that is generated when a port turns into
discarding state form forwarding state.

The SNMP trap that is generated when the bridge is no longer
the root bridge of the instance.  Another switch with higher
priority has already been the root bridge of the instance.

The SNMP trap that is generated when a root-guard port
receives a superior message on the relevant instance.

The SNMP trap is generated when an edged port of the BPDU-guard
device receives a BPDU.  If the designated bridge ID can't be obtained
from the BPDU, the designated bridge ID will be zero.

The SNMP trap that is generated when an Alternate-Port
or Root-Port is aged out.

The SNMP trap is generated when the sending device becomes the new
root of the spanning tree.  The first root bridge ID means the
old root bridge ID, and the second one means the new root bridge ID.

The SNMP trap is generated when a PVST BPDU is received on an MSTP port
that is enabled with the PVST protection feature.  If the designated
bridge ID can't be obtained from the BPDU, the designated bridge ID
will be zero.

A topology change trap is sent by a bridge when any of
its configured ports transits from the Learning state
to the Forwarding state, or from the Forwarding state to
the Blocking state.