Configuring Lldp; Overview; Background; Basic Concepts - HP 1910 User Manual
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Configuring LLDP
Overview
Background
In a heterogeneous network, a standard configuration exchange platform ensures that different types of
network devices from different vendors can discover one another and exchange configuration for the
sake of interoperability and management.
The IETF drafted the Link Layer Discovery Protocol (LLDP) 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 (type, length, and value) triplets in LLDP Data Units (LLDPDUs) to the directly connected
devices. At the same time, the device stores the device information received in LLDPDUs sent from the
LLDP neighbors in a standard management information base (MIB). For more information about MIBs,
see
"Configuring
Layer 2 network topology changes.
Basic concepts
LLDPDU formats
LLDP sends device information in LLDP data units (LLDPDUs). LLDPDUs are encapsulated in Ethernet II or
Subnetwork Access Protocol (SNAP) frames.
LLDPDUs encapsulated in Ethernet II
1.
Figure 199 LLDPDU encapsulated in Ethernet II
Table 71 Description of the fields in an Ethernet II encapsulated LLDPDU
Field
Destination MAC address
Source MAC address
SNMP." LLDP enables a network management system to quickly detect and identify
Description
MAC address to which the LLDPDU is advertised. It is fixed to
0x0180-C200-000E, a multicast MAC address.
MAC address of the sending port.
182
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