KB.15.15

Figure 111 Example of remote device LLDP information

Tracking LLDP-MED connects and disconnects—topology change notification

This optional feature provides information an SNMP application can use to track LLDP-MED connects

and disconnects.

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.

• The LLDP-MED class of the device detected on the port.

The show running command shows whether the topology change notification feature is enabled

or disabled. For example, if ports A1 to 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.

If a detected LLDP-MED neighbor begins sending advertisements without LLDP-MED TLVs, the switch

sends a top-change-notify trap.

LLDP-MED fast start control

Syntax

lldp fast-start-count 1 - 10

An LLDP-MED device connecting to a switch port may use the data contained in the MED TLVs from

the switch to configure itself. However, the lldp refresh-interval setting (default: 30 seconds)

for transmitting advertisements can cause an unacceptable delay in MED device configuration.

Tracking LLDP-MED connects and disconnects—topology change notification 227