R3303-HP HSR6800 Routers Layer 2 - LAN Switching Configuration Guide

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Configuring LLDP
Overview
In a heterogeneous network, having a standard configuration exchange platform ensures that different
types of network devices from different vendors can discover one another and exchange configuration
information for the sake of interoperability and management.
The Link Layer Discovery Protocol (LLDP) is specified in IEEE 802.1AB. The protocol operates on the data
link layer to exchange device information between directly connected devices. With LLDP, a device sends
local device information (including its major functions, management IP address, device ID, and port ID)
as TLV triplets in LLDP Data Units (LLDPDUs) to directly connected devices. At the same time, the device
stores device information received in LLDPDUs sent from LLDP neighbors in a standard MIB. For more
information about MIBs, see Network Management and Monitoring Configuration Guide. LLDP enables
a network management system to quickly detect and identify changes to Layer 2 network topology.
Basic concepts
LLDPDU formats
LLDP sends device information in LLDPDUs. LLDPDUs are encapsulated in Ethernet II or SNAP frames.
1. LLDPDU encapsulated in Ethernet II
Figure 74 LLDPDU encapsulated in Ethernet II
Table 20 Fields in an Ethernet II-encapsulated LLDPDU
Field Descri
p
tion
Destination MAC address
MAC address to which the LLDPDU is advertised. It is fixed to
0x0180-C200-000E, a multicast MAC address.
Source MAC address
MAC address of the sending port. If the port does not have a MAC address,
the MAC address of the sending bridge is used.
Type Ethernet type for the upper layer protocol. It is 0x88CC for LLDP.
Data LLDPDU.