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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Debugging LLDP

You can view the TLVs that your system is sending and receiving.

To view the TLVs, use the following commands.
  • View a readable version of the TLVs.
    debug lldp brief
  • View a readable version of the TLVs plus a hexadecimal version of the entire LLDPDU, including unrecognized TLVs.
    debug lldp detail
    To stop viewing the LLDP TLVs sent and received by the system, use the no debug lldp command.
Figure 1. The debug lldp detail Command — LLDPDU Packet Dissection
Illustration of the debug lldp detail command—LLDPDU packet dissection.

Example of debug lldp Command Output with Unrecognized Reserved and Organizational Specific LLDP TLVs

The following is an example of LLDPDU with both (Reserved and Organizational specific) unrecognized TLVs.

DellEMC#Dec  4 22:38:27 : Received LLDP pkt on TenGigabitEthernet 1/1 of length 204 :
Dec  4 22:38:27 : Packet dump:
Dec  4 22:38:27 :  01 80 c2 00 00 0e 00 a0 c9 00 00 03 81 00 00 00
Dec  4 22:38:27 :  88 cc 02 07 04 00 a0 c9 00 00 01 04 02 05 54 06
Dec  4 22:38:27 :  02 01 2c fe 05 aa bb cc 04 61 fa 01 40 00 00 00
Dec  4 22:38:28 :  00 00 00 00 00 00 00 00 c6 0f ba 27
Dec  4 22:38:28 : TLV: Chassis ID, Len: 7, Subtype: Mac address (4) Value: 00:a0:c9:00:00:01
Dec  4 22:38:29 : TLV: Port ID, Len: 2, Subtype: Interface name (5) Value: T
Dec  4 22:38:29 : TLV: TTL, Len: 2, Value: 300
Dec  4 22:38:29 : TLV: UNKNOWN TLV, ORG_SPEC[aa-bb-cc, 4], Len: 1, Value:a
Dec  4 22:38:29 :  aa bb cc 04 61
Dec  4 22:38:29 :  40
Dec  4 22:38:29 : TLV: UNKNOWN TLV, Type: 125 Len: 1, Value: @
Dec  4 22:38:29 : TLV: ENDOFPDU, Len: 0

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