Neighbor Discovery Overview
Fixed Switch Configuration Guide 13-5
Figure 13-2 LLDP-MED
LLDPDU Frames
As shown in Figure 13-3 on page 13-6, each LLDPDU frame contains the following mandatory
TLVs:
• Chassis ID — The chassis identification for the device that transmitted the LLDP packet.
• Port ID — The identification of the specific port that transmitted the LLDP packet. The
receiving LLDP agent joins the chassis ID and the port ID to correspond to the entity
connected to the port where the packet was received.
• Time to Live — The length of time that information contained in the receive LLDP packet will
be valid.
• End of LLDPDU — Indicates the final TLV of the LLDPDU frame.
IP Network
Infrastructure
(IEEE 802 LAN)
LLDP-MED Communication Device Endpoints
(Class III): Support IP communication end user
(for example, IP phone, soft phone)
LLDP-MED Network Connectivity Devices:
Provide IEEE 802 network access to
LLDP-MED endpoints
(for example, L2/L3 switch)
LLDP-MED Generic Endpoints (Class I):
Basic participant endpoints in LLDP-MED
(for example, IP communications controller)
LLDP-MED Media Endpoints (Class ll):
Supports IP media streams
(for media gateways, conference bridges)
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