LLDP¶

802.1AB Link-Layer Discovery Protocol (LLDP) provides information to devices that are directly adjacent to them on the local LAN.

LLDP sends information periodically and at link status change time to indicate the configuration parameters of the device.

This protocol allows the router to:

advertise its identity and capabilities on the local network
receive the same information from a physically adjacent layer 2 peer

LLDP uses Ethernet as its transport protocol, the Ethernet type for LLDP is 0x88CC.

User can control which information is being sent from the router:

description of the device
system name
the IP address to reach the device on LLDP port

User has to define the list of interfaces on which LLDP is active.

The chassis ID will be set automatically.

To configure LLDP to start on the eth1 interface, reachable on the 10.125.0.1 address, with name vsr and description Router, do:

vsr running config# / vrf main interface physical eth2 port pci-b0s5
vsr running config# / vrf main interface physical eth2 ipv4 address 10.125.0.1/24
vsr running config# / vrf main lldp interface eth2
vsr running interface eth2# / vrf main lldp system-name vsr
vsr running interface eth2# / vrf main lldp system-description Router
vsr running interface eth2# / vrf main lldp management-address 10.125.0.1

To display the LLDP state:

vsr> show state vrf main lldp
lldp
    enabled true
    hello-timer 30
    system-name vsr
    system-description Router
    counters
        frame-in 1
        frame-out 1
        frame-discard 0
        tlv-discard 0
        ..
    chassis-id de:ad:de:01:02:03
    chassis-id-type mac-address
    management-address 10.125.0.1
    interface eth2
        enabled true
        counters
            frame-in 1
            frame-out 1
            frame-discard 0
            tlv-discard 0
            ..
        neighbor id eth2
            port-id de:ed:02:cc:e5:c9
            port-id-type mac-address
            port-description eth2
            management-address 10.125.0.2
            system-name router
            system-description Router
            chassis-id de:ad:de:01:02:03
            chassis-id-type mac-address
            capability mac-bridge
                enabled false
                ..
            capability router
                enabled true
                ..
            capability wlan-access-point
                enabled false
                ..
            capability station-only
                enabled false
                ..
            ..
        ..
    ..

The same configuration can be made using this NETCONF XML configuration:

vsr> show config xml absolute nodefault vrf main lldp
<config xmlns="urn:6wind:vrouter">
  <vrf>
    <name>main</name>
    <lldp xmlns="urn:6wind:vrouter/lldp">
      <system-name>vsr</system-name>
      <system-description>Router</system-description>
      <management-address>10.125.0.1</management-address>
      <interface>
        <name>eth2</name>
      </interface>
    </lldp>
  </vrf>
</config>