Administrator Guide

The system processes each LLDP frame to retrieve the OUI, subtype, and data length, and stores the retrieved data of
organizational specific unrecognized LLDP TLVs in a list. The stored list of organizational TLVs is removed when the neighbor is
lost or neighbor ages out. The software assigns a temporary identification index for each unrecognized organizational specific
LLDP TLVs upon receiving more than one TLV with the same OUI and subtype, but with different organizationally defined
information strings.
NOTE:
The system increments the TLV discard counter and does not store unrecognized LLDP TLV information in following
scenarios:
● If there are multiple TLVs with the same information is received
● If DCBX is down on the receiving interface
The organizational specific TLV list is limited to store 256 entries per neighbor. If TLV entries are more than 256, then the oldest
entry (of that neighbor) in the list is replaced. A syslog message appears when the organization specific unrecognized TLV list
exceeds more than 205 entries (80 percent of 256) for you to take action. Following shows the syslog message:
Nov 14 03:01:53 %STKUNIT2-M:CP %LLDP-5-LLDP_ORG_UNRECOGNISED_TLV_MAX: Received
Organizational Specific unrecognised TLVs exceeds threshold (205) from Remote Chassis
ID: 4c:76:25:f4:ab:00, Remote Port ID: fortyGigE 1/2/8/1 on interface: Te 2/31/1
Viewing Unrecognized LLDP TLVs
You can view or retrieve the stored unrecognized (reserved and organizational specific) TLVs using the show lldp
neighbor details command.
View all the LLDP TLV information including unrecognized TLVs, using the snmpwalk and snmpget commands.
Viewing the LLDP Configuration
To view the LLDP configuration, use the following command.
● Display the LLDP configuration.
CONFIGURATION or INTERFACE mode
show config
The following example shows viewing an LLDP global configuration.
DellEMC(conf)#protocol lldp
DellEMC(conf-lldp)#show config
!
protocol lldp
advertise dot1-tlv port-protocol-vlan-id port-vlan-id
advertise dot3-tlv max-frame-size
advertise management-tlv system-capabilities system-description
hello 10
no disable
DellEMC(conf-lldp)#
DellEMC(conf-lldp)#exit
DellEMC(conf)#interface tengigabitethernet 1/31
DellEMC(conf-if-te-1/31)#show config
!
interface TenGigabitEthernet 1/31
no ip address
switchport
no shutdown
DellEMC(conf-if-te-1/31)#protocol lldp
DellEMC(conf-if-te-1/31-lldp)#show config
!
protocol lldp
DellEMC(conf-if-te-1/31-lldp)#
Link Layer Discovery Protocol (LLDP)
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