Administrator Guide

○ location-identification
○ power-via-mdi
○ softphone-voice
○ streaming-video
○ video-conferencing
○ video-signaling
○ voice
○ voice-signaling
In the following example, LLDP is enabled globally. R1 and R2 are transmitting periodic LLDPDUs that contain management,
802.1, and 802.3 TLVs.
Figure 80. Configuring LLDP
Storing and Viewing Unrecognized LLDP TLVs
Dell EMC Networking OS provides support to store unrecognized (reserved and organizational specific) LLDP TLVs. Also,
support is extended to retrieve the stored unrecognized TLVs using SNMP.
When the incoming TLV from LLDP neighbors is not recognized, the TLV is categorized as unrecognized TLV. The unrecognized
TLVs is categorized into two types:
1. Reserved unrecognized LLDP TLV
2. Organizational specific unrecognized LLDP TLV
Reserved Unrecognized LLDP TLVs
The type value for reserved TLV ranging from 9 to 126.
The system processes each LLDP frame to retrieve the type and length, and stores the retrieved data of reserved unrecognized
LLDP TLVs in a list. The stored list of unrecognized TLVs is removed when subsequent LLDP neighbor frame is received,
neighbor is lost, or neighbor ages out. If there are multiple unrecognized TLVs with the same TLV type, only the information of
first unrecognized TLV is stored and the TLV discard counter is incremented for the successive TLVs.
Organizational Specific Unrecognized LLDP TLVs
The type value for organizational specific TLV is 127.
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.
Link Layer Discovery Protocol (LLDP)
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