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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.
|
