LLDP (Link Layer Discovery Protocol)

Example:

Reference model:

• Switch model name: AS7816-64X
• Edgecore SONiC version: SONiC.Edgecore-SONiC_20200116_051623_ec201904_128

Restriction:

1. There is no SONiC command to disable LLDP.  (Workaround: "sudo systemctl stop lldp.service". However, LLDP service restart after rebooting)
   • Start/Stop LLDP service:  sudo systemctl [start|stop] lldp
   • Enable/Disable LLDP service by default: sudo systemctl [enable|disable] lldp

Default setting:

1. LLDP is enabled
2. LLDP PDU interval : 30 seconds
3. Support LLDP extended MIB (lldpremtable, lldplocporttable, lldpremmanaddrtable, lldplocmanaddrtable, lldpLocalSystemData).  Refer to SNMP configuration

Procedures:

Step 1. check LLDP table

admin@sonic:~$ show lldp table 
Capability codes: (R) Router, (B) Bridge, (O) Other
LocalPort    RemoteDevice    RemotePortID    Capability    RemotePortDescr
-----------  --------------  --------------  ------------  -----------------
Ethernet24   sonic           fortyGigE52     BR            Ethernet60
--------------------------------------------------

Step 2. check LLDP neighbor

admin@sonic:~$ show lldp neighbors Ethernet24
-------------------------------------------------------------------------------
LLDP neighbors:
-------------------------------------------------------------------------------
Interface:    Ethernet24, via: LLDP, RID: 5, Time: 0 day, 00:04:51
  Chassis:     
    ChassisID:    mac a8:2b:b5:9d:c0:bb
    SysName:      sonic
    SysDescr:     Debian GNU/Linux 9 (stretch) Linux 4.9.0-9-2-amd64 #1 SMP Debian 4.9.168-1+deb9u3 (2015-12-19) x86_64
    TTL:          120
    MgmtIP:       10.1.0.1
    MgmtIP:       fe80::aa2b:b5ff:fe9d:c0bb
    Capability:   Bridge, on
    Capability:   Router, on
    Capability:   Wlan, off
    Capability:   Station, off
  Port:        
    PortID:       local fortyGigE52
    PortDescr:    Ethernet60
-------------------------------------------------------------------------------