System information

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• IP Phone 1220

• IP Phone 1230

Description

The IEEE 802.1ab Link Layer Discovery Protocol (LLDP) defines a

standard method for Ethernet network devices, such as IP Phones,

switches, and routers to exchange information about their capabilities with

other devices and to store this information in a Management Information

Base (MIB).

LLDP also enables the system administrator to view the entire network

infrastructure.

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.

The 802.1ab feature is enabled by default. However, you can disable the

feature during manual configuration.

For information about 802.1ab configuration, see “Provisioning the IP

Phones” (page 447).

Dynamic Host Conﬁguration Protocol

This section provides information about Dynamic Host Configuration

Protocol (DHCP) server installation, configuration, and operation.

If you are not familiar with DHCP, Nortel recommends reading Request for

Comments (RFC) 2131 "Dynamic Host Configuration Protocol", RFC 1533

"DHCP Options and BOOTP Vendor Extensions", and the Help manual for

the DHCP server on the host.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.02 26 May 2009