Tip

This is the documentation for the 19.02 version. Looking for the documentation of the latest version? Have a look here.

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Link Layer Discovery Protocol

The Link Layer Discovery Protocol (LLDP) service provides a method for discovering which routers are connected to a LAN segment, and offers a way to discover the topology of a network.

Configuring the LLDP Service

LLDP is configured in two places: One for the router level parameters and one the per-interface parameters.

The router level has three parameters:

System Name:

The router hostname to advertise via LLDP

Transmit Interval:

The transmit interval controls the time between LLDP messages in seconds.

Transmit Hold Time:

The transmit hold time is the multiple of the transmit interval which is used for the Time-To-Live (TTL) of the LLDP message.

For example, if the transmit interval is 5 and the transmit hold time is 4, then the advertised TTL of the LLDP message is 20.

Configure the router level parameters in configuration mode (Configuration Mode):

tnsr(config)# lldp system-name MyRouter
tnsr(config)# lldp tx-hold 3
tnsr(config)# lldp tx-interval

These parameters can be changed at any time.

The interface level has additional per-interface parameters:

Port Name:

The name of the interface, as advertised in LLDP

Management IP Address (IPv4 & IPv6):

The IPv4 and/or IPv6 address to advertise as a means to manage this router on this interface.

Management OID:

An object identifier associated with the management IP address

These settings are optional:

tnsr(config)# interface TenGigabitEthernet3/0/0
tnsr(config-interface)# lldp port-name MyPort
tnsr(config-interface)# lldp management ipv4 192.0.2.123
tnsr(config-interface)# lldp management ipv6 2001:db8::1:2:3:4
tnsr(config-interface)# exit
tnsr(config)#

Warning

A limitation of the underlying API means that interface values must be configured at the same time and cannot be changed. This will be fixed in a later release.