Configuring for Network Management Applications

LLDP (Link-Layer Discovery Protocol)

Syntax: lldp top-change-notify < port-list>

Topology change notification, when enabled on an LLDP port, causes the switch to send an SNMP trap if it detects LLDP- MED endpoint connection or disconnection activity on the port, or an age-out of the LLDP-MED neighbor on the port. The trap includes the following information:

■ the port number (internal) on which the activity was detected (For more in internal port numbers, refer to “Determining the Switch Port Number Included in Topology Change Notification Traps” on page 13-76.)

■ the LLDP-MED class of the device detected on the port (“LLDP-MED Endpoint Device Classes” on page 13-57.)

The show running command shows whether the topology change notification feature is enabled or disabled. For example, if ports A1-A10 have topology change notification enabled, the following entry appears in the show running output:

lldp top-change-notify A1-A10

 

(Default: Disabled)

 

Note: To send traps, this feature requires access to at least

 

one SNMP server. For information on configuring traps,

 

refer to “SNMP Notifications” on page 13-18.

 

Also, if a detected LLDP-MED neighbor begins sending

 

advertisements without LLDP-MED TLVs, the switch sends

 

a top-change-notify trap.

 

 

N o t e

Topology change notifications provide one method for monitoring system

 

activity. However, because SNMP normally employs UDP, which does not

 

guarantee datagram delivery, topology change notification should not be

 

relied upon as the sole method for monitoring critical endpoint device

 

connectivity.

 

 

13-59