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APPLICATION NOTE - Deploying IP Telephony with EX Series Ethernet Switches

LLDP, also known as IEEE 802.1AB, is a standards-based Layer 2 protocol that allows network devices to advertise and

receive their identity and capabilities on a LAN segment, most of them directly connected. This protocol, developed as

an open standard, was modeled after various vendor-specific proprietary discovery protocols such as Cisco Discovery

Protocol (CDP), Extreme Discovery Protocol (EDP), Nortel Discovery Protocol (NDP) and others. The EX Series has

embraced the open, standards-based LLDP as their Layer 2 discovery protocol.

LLDP-MED is an extension to the IEEE 802.1AB standard published by the Telecommunications Industry Association

(TIA). This standard, ANSI/TIA-1057, is designed to support interoperability between VoIP endpoint devices and other

networking end-devices, focusing mainly on discovery to facilitate information sharing between endpoints and network

infrastructure devices. Some of the benefits of LLDP-MED include:

• Network policy discovery that allows endpoints and switches to advertise their VLAN IDs (for example, voip-VLAN),

Layer 2 Priority and Differentiated Services Code Point (DSCP)

• Power over Ethernet (PoE) management that allows endpoint devices to advertise their actual PoE levels and

enables power sourcing equipment (like switches) to budget their power allocation accordingly

• Inventory management discovery that stores endpoint device information such as vendor, model firmware and

serial number on the switch and makes it accessible to network management systems for inventory reporting

purposes

VoIP Phones with LLDP-MED Support—Vendor and Model List

Some VoIP phone vendors and their respective LLDP-MED-compatible VoIP phones are listed below. The information

in this section, current as of May 2008, has been gathered from publicly available sources such as vendor websites. To

confirm the latest VoIP phones with LLDP-MED support, consult each vendor’s product documentation.

Avaya LLDP-MED VoIP phone models:

• 9600 Series with firmware release 1.2.1

• 4600 Series with firmware release 2.6

Cisco Systems LLDP-MED VoIP phone models:

• 7906G

• 7911G

• 7931G

• 7941G/7941G-GE

• 7942G

• 7945G

• 7961G/7961G-GE

• 7962G

• 7965G

• 7970G/ 7971G-GE

• 7975G

Nortel LLDP-MED VoIP phone models:

While LLDP and LLDP-MED help simplify IP telephony deployments, it is important to understand how they interact

with the VoIP phones and switches—specifically with the EX Series, which will not advertise their capabilities via LLDP-

MED when a port is first brought online.

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Cisco Ex SERIES Manual de usuario Pagina 4