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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 management address transmitted via LLDP.
.. 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
--------- ----- ----- --- -------- -------
Switch0815 eth0 LLDP B Cisco IOS Software, Gi0/4
.. 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: 1, Time: 12 days, xxxx:xxxx:40
Chassis:
ChassisID: mac 00:50:40:20:03:00
SysName: Switch0815
SysDescr: Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 15.0(2)SE11, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2017 by Cisco Systems, Inc.
Compiled Sat 19-Aug-17 09:34 by prod_rel_team
MgmtIP: 192.0.2.201
Capability: Bridge, on
Port:
PortID: ifname Gi0/4
PortDescr: GigabitEthernet0/4
TTL: 120
PMD autoneg: supported: yes, enabled: yes
Adv: 10Base-T, HD: yes, FD: yes
Adv: 100Base-TX, HD: yes, FD: yes
Adv: 1000Base-T, HD: no, FD: yes
MAU oper type: 1000BaseTFD - Four-pair Category 5 UTP, full duplex mode
VLAN: 1, pvid: yes
LLDP-MED:
Device Type: Network Connectivity Device
Capability: Capabilities, yes
Capability: Policy, yes
Capability: Location, yes
Capability: Inventory, yes
LLDP-MED Network Policy for: Voice, Defined: no
Priority: Best effort
PCP: 0
DSCP Value: 0
LLDP-MED Network Policy for: Voice Signaling, Defined: no
Priority: Best effort
PCP: 0
DSCP Value: 0
Inventory:
Hardware Revision: WS-C2960G-8TC-L (PowerPC405):C0
Software Revision: 15.0(2)SE11
Manufacturer: Cisco Systems, Inc.
Model: WS-C2960G-8TC-L
.. opcmd:: show lldp neighbors interface <interface>
Show LLDP neighbors connected via interface `<interface>`.
.. opcmd:: show log lldp
Used for troubleshooting.
|
