Enabling traps and displaying trap configuration

Syntax:


spanning-tree trap [ errant-bpdu | loop-guard | new-root topology-change [vlan < vid-list >| instance [instance-ID] {cstt} | root-guard ]

no spanning-tree trap [ errant-bpdu | loop-guard | new-root topology-change [vlan < vid-list >| instance [instance-ID] {cstt} | root-guard ]

Enables or disables SNMP traps for errant-BPDU, loop guard, new root, and root guard event notifications.

errant-bpdu

Enables SNMP notification when an errant BPDU is received. Designed for use with BPDU filtering (see Configuring BPDU filtering).

loop-guard

Enables SNMP notification when a loop guard inconsistency is detected. Designed for use with the Loop Guard option (see Configuring STP loop guard).

new-root

Enables SNMP notification when a new root is elected on any VLAN configured for RPVST+ on the switch.

topology-change

Enables notifications sent when a topology change occurs.

topology-change-history

Shows the spanning tree topology history changes.

root-guard

Enables SNMP notifications when a root-guard inconsistency is detected.

Default for all of the above options: Disabled

The no form of the command disables traps on the switch.

Syntax:

show spanning-tree traps

Displays the current spanning tree trap configuration on the switch.

Displaying spanning tree traps in the default configuration

switch# show spanning-tree traps

 Status and Counters - STP Traps Information

 Trap Name              | Status
 ---------------------- + --------
 errant-bpdu            | Disabled
 new-root               | Disabled
 root-guard             | Disabled
 loop-guard             | Disabled