251
Link Layer Discovery Protocol (802.1ab)
This chapter describes the Link Layer Discovery Protocol (LLDP) (IEEE
802.1ab) and contains the following topics:
•
"Link Layer Discover Protocol (IEEE 802.1ab) Overview" (page 251)
•
"Configuring LLDP using the CLI" (page 255)
•
"Configuring LLDP using Device Manager" (page 269)
Link Layer Discover Protocol (IEEE 802.1ab) Overview
Release 5.0 software supports the Link Layer Discovery Protocol (LLDP)
(IEEE 802.1ab), which enables stations connected to a LAN to advertise
their capabilities to each other, enabling the discovery of physical topology
information for network management. LLDP-compatible stations can
consist of any interconnection device including PCs, IP Phones, switches,
and routers. Each LLDP station stores LLDP information in a standard
Management Information Base (MIB), making it possible for a network
management system (NMS) or application to access the information.
Each LLDP station:
•
advertises connectivity and management information about the local
station to adjacent stations on the same 802 LAN (802.3 Ethernet with
4500 Series).
•
receives network management information from adjacent stations on
the same LAN.
LLDP also makes it possible to discover certain configuration inconsistencies
or malfunctions that can result in impaired communications at higher layers.
For example, it can be used to discover duplex mismatches between an IP
Phone and the connected switch.
LLDP is compatible with IETF PROTO MIB (IETF RFC 2922).
LLDP: how it works
shows an example of how LLDP works in a network.
Nortel Ethernet Routing Switch 4500 Series
Overview — System Configuration
NN47205-500
02.01
Standard
5.0
23 February 2007
Copyright © 2007, Nortel Networks
Nortel Networks Confidential
.