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