White Papers

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 specic 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 specic 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 specic) TLVs using the show lldp neighbor
details command.
For more details, see Viewing Information Advertised by Adjacent LLDP Neighbors.
View all the LLDP TLV information including unrecognized TLVs, using the snmpwalk and snmpget commands.
For more details, see MIB Support to Display Unrecognized LLDP TLVs.
Viewing the LLDP Conguration
To view the LLDP conguration, use the following command.
• Display the LLDP conguration.
CONFIGURATION or INTERFACE mode
show config
Examples of Viewing LLDP Congurations
The following example shows viewing an LLDP global conguration.
R1(conf)#protocol lldp
R1(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
R1(conf-lldp)#
The following example shows viewing an LLDP interface conguration.
R1(conf-lldp)#exit
R1(conf)#interface tengigabitethernet 1/31
R1(conf-if-te-1/31)#show config
!
interface TengigabitEthernet 1/31
no ip address
switchport
no shutdown
R1(conf-if-te-1/31)#protocol lldp
R1(conf-if-te-1/31-lldp)#show config
586
Link Layer Discovery Protocol (LLDP)