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LLDP
----
The Link Layer Discovery Protocol (LLDP) is a vendor-neutral
link layer protocol in the Internet Protocol Suite used by network devices for
advertising their identity, capabilities, and neighbors on an IEEE 802 local
area network, principally wired Ethernet.[1] The protocol is formally referred
to by the IEEE as Station and Media Access Control Connectivity Discovery
specified in IEEE 802.1AB and IEEE 802.3-2012 section 6 clause 79.
LLDP performs functions similar to several proprietary protocols, such as
`Cisco Discovery Protocol`_, `Foundry Discovery Protocol`_,
Nortel Discovery Protocol and Link Layer Topology Discovery.
Information gathered
^^^^^^^^^^^^^^^^^^^^
Information gathered with LLDP is stored in the device as a management
information database (MIB_) and can be queried with the Simple Network
Management Protocol (SNMP_) as specified in RFC 2922. The topology of an
LLDP-enabled network can be discovered by crawling the hosts and querying this
database. Information that may be retrieved include:
* System name and description
* Port name and description
* VLAN name
* IP management address
* System capabilities (switching, routing, etc.)
* MAC/PHY information
* MDI power
* Link aggregation
Configuration
^^^^^^^^^^^^^
* Enable service with:
:code:`set service lldp`
Options
*******
* Configure a Define management-address:
:code:`set service lldp management-address <x.x.x.x>`
* Define listening interfaces
:code:`set service lldp interface <all|interface name>`
* LLDPd also implements an SNMP subagent. To Enable SNMP queries of the LLDP
database:
:code:`set service lldp snmp enable`
* Enable optional/other protocols
:code:`set service lldp legacy-protocols cdp`
Supported legacy protocols:
* ``cdp`` - Listen for CDP for Cisco routers/switches
* ``edp`` - Listen for EDP for Extreme routers/switches
* ``fdp`` - Listen for FDP for Foundry routers/switches
* ``sonmp`` - Listen for SONMP for Nortel routers/switches
Display neighbors
^^^^^^^^^^^^^^^^^
* Display with:
``show lldp neighbors``
Exemple:
.. code-block:: sh
vyos@vyos:~# show lldp neighbors
Capability Codes: R - Router, B - Bridge, W - Wlan r - Repeater, S - Station
D - Docsis, T - Telephone, O - Other
Device ID Local Proto Cap Platform Port ID
--------- ----- ----- --- -------- -------
swA309 eth0 LLDP ? Cisco IOS Software, GigE0/33
* Options:
* ``detail`` - Show lldp neighbors detail
* ``interface`` - Show LLDP for specified interface
Troubleshooting
^^^^^^^^^^^^^^^
Use operationnal command ``show log lldp`` to display logs.
.. _`Cisco Discovery Protocol`: https://en.wikipedia.org/wiki/Cisco_Discovery_Protocol
.. _`Foundry Discovery Protocol`: https://en.wikipedia.org/wiki/Foundry_Discovery_Protocol
.. _MIB: https://en.wikipedia.org/wiki/Management_information_base
.. _SNMP: https://en.wikipedia.org/wiki/Simple_Network_Management_Protocol
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