User's Manual

482 802.1ab Link Layer Discovery Protocol

The Telecommunications Industry Association (TIA) developed the

Link Layer Discovery Protocol (LLDP)-Media Endpoint Discovery

(LLDP-MED) extension of 802.1ab LLDP for VoIP networks, as defined by

ANSI/TIA-1057. This extension enables media devices such as IP Phones,

IP media gateways, IP media servers, and IP media controllers to transmit

and receive media related information.

LLDP provides the following functionality

•

periodic transmission of advertisements containing device information

• device capabilities and media specific configuration information to

neighbors in the same network

• implementation of behavioral requirements specified by LLDP-MED

The 802.1ab feature provides automatic configuration of the IP Phone

network policy parameters, such as VLAN ID, as well as, automatic

detection of misconfigurations, such as Duplex discrepancies.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 02.07

5 February 2009