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+.. _lldp:
+
+####
+LLDP
+####
+
+:abbr:`LLDP (Link Layer Discovery Protocol)` 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. 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
+:abbr:`CDP (Cisco Discovery Protocol)`, :abbr:`FDP (Foundry Discovery Protocol)`,
+:abbr:`NDP (Nortel Discovery Protocol)` and :abbr:`LLTD (Link Layer Topology
+Discovery)`.
+
+Information gathered with LLDP is stored in the device as a :abbr:`MIB
+(Management Information Database)` and can be queried with :abbr:`SNMP (Simple
+Network Management Protocol)` 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
+=============
+
+.. cfgcmd:: set service lldp
+
+   Enable LLDP service
+
+.. cfgcmd:: set service lldp management-address <address>
+
+   Define IPv4/IPv6 management address transmitted via LLDP. Multiple addresses
+   can be defined. Only addresses connected to the system will be transmitted.
+
+.. cfgcmd:: set service lldp interface <interface>
+
+   Enable transmission of LLDP information on given `<interface>`. You can also
+   say ``all`` here so LLDP is turned on on every interface.
+
+.. cfgcmd:: set service lldp interface <interface> disable
+
+   Disable transmit of LLDP frames on given `<interface>`. Useful to exclude
+   certain interfaces from LLDP when ``all`` have been enabled.
+
+.. cfgcmd:: set service lldp snmp enable
+
+   Enable SNMP queries of the LLDP database
+
+.. cfgcmd:: set service lldp legacy-protocols <cdp|edp|fdp|sonmp>
+
+   Enable given legacy protocol on this LLDP instance. Legacy protocols include:
+
+   * ``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
+
+Operation
+=========
+
+.. opcmd:: show lldp neighbors
+
+   Displays information about all neighbors discovered via LLDP.
+
+   .. code-block:: none
+
+     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
+     ---------                 -----     -----  ---   --------             -------
+     BR2.vyos.net              eth0      LLDP   R     VyOS 1.2.4           eth1
+     BR3.vyos.net              eth0      LLDP   RB    VyOS 1.2.4           eth2
+     SW1.vyos.net              eth0      LLDP   B     Cisco IOS Software   GigabitEthernet0/6
+
+.. opcmd:: show lldp neighbors detail
+
+   Get detailed information about LLDP neighbors.
+
+   .. code-block:: none
+
+     vyos@vyos:~$ show lldp neighbors detail
+     -------------------------------------------------------------------------------
+     LLDP neighbors:
+     -------------------------------------------------------------------------------
+     Interface:    eth0, via: LLDP, RID: 28, Time: 0 day, 00:24:33
+       Chassis:
+         ChassisID:    mac 00:53:00:01:02:c9
+         SysName:      BR2.vyos.net
+         SysDescr:     VyOS 1.3-rolling-201912230217
+         MgmtIP:       192.0.2.1
+         MgmtIP:       2001:db8::ffff
+         Capability:   Bridge, on
+         Capability:   Router, on
+         Capability:   Wlan, off
+         Capability:   Station, off
+       Port:
+         PortID:       mac 00:53:00:01:02:c9
+         PortDescr:    eth0
+         TTL:          120
+         PMD autoneg:  supported: no, enabled: no
+           MAU oper type: 10GigBaseCX4 - X copper over 8 pair 100-Ohm balanced cable
+       VLAN:         201 eth0.201
+       VLAN:         205 eth0.205
+       LLDP-MED:
+         Device Type:  Network Connectivity Device
+         Capability:   Capabilities, yes
+         Capability:   Policy, yes
+         Capability:   Location, yes
+         Capability:   MDI/PSE, yes
+         Capability:   MDI/PD, yes
+         Capability:   Inventory, yes
+         Inventory:
+           Hardware Revision: None
+           Software Revision: 4.19.89-amd64-vyos
+           Firmware Revision: 6.00
+           Serial Number: VMware-42 1d 83 b9 fe c1 bd b2-7
+           Manufacturer: VMware, Inc.
+           Model:        VMware Virtual Platform
+           Asset ID:     No Asset Tag
+     -------------------------------------------------------------------------------
+
+.. opcmd:: show lldp neighbors interface <interface>
+
+   Show LLDP neighbors connected via interface `<interface>`.
+
+.. opcmd:: show log lldp
+
+   Used for troubleshooting.