LLDP
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. 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 CDP, FDP, NDP and LLTD.
Information gathered with LLDP is stored in the device as a MIB and can be queried with 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
Define IPv4/IPv6 management address transmitted via LLDP. Multiple addresses can be defined. Only addresses connected to the system will be transmitted.
Enable transmission of LLDP information on given <interface>. You can also
say all here so LLDP is turned on on every interface.
Disable transmit of LLDP frames on given <interface>. Useful to exclude
certain interfaces from LLDP when all have been enabled.
Enable given legacy protocol on this LLDP instance. Legacy protocols include:
cdp- Listen for CDP for Cisco routers/switchesedp- Listen for EDP for Extreme routers/switchesfdp- Listen for FDP for Foundry routers/switchessonmp- Listen for SONMP for Nortel routers/switches
Operation
Displays information about all neighbors discovered via LLDP.
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
Get detailed information about LLDP neighbors.
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
-------------------------------------------------------------------------------