RTS DV-3400 Technical Information PDF herunterladen (Seite 401)

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Configuring for Network Management Applications

LLDP (Link-Layer Discovery Protocol)

■ provide information on network connectivity capabilities (for

example, a multi-port VoIP phone with Layer 2 switch capability)

■ support the fast start capability

Note LLDP-MED is intended for use with VoIP endpoints, and is not designed to

support links between network infrastructure devices, such as switch-to-

switch or switch-to-router links.

LLDP-MED Endpoint Device Classes. LLDP-MED endpoint devices are,

by definition, located at the network edge and communicate using the LLDP-

MED framework. Any LLDP-MED endpoint device belongs to one of the

following three classes:

■ Class 1 (Generic Endpoint Devices): These devices offer the basic

LLDP discovery services, network policy advertisement (VLAN ID,

Layer 2/802.1p priority, and Layer 3/DSCP priority), and PoE manage-

ment. This class includes such devices as IP call controllers and

communication-related servers.

■ Class 2 (Media Endpoint Devices): These devices offer all Class 1

features plus media streaming capability, and include such devices as

voice/media gateways, conference bridges, and media servers.

■ Class 3 (Communication Devices): These devices are typically IP

phones or end-user devices that otherwise support IP media and offer

all Class 1 and Class 2 features, plus location identification and

emergency 911 capability, Layer 2 switch support, and device infor-

mation management.

LLDP-MED Operational Support on the 5300xl and 4200vl Switches.

The 4200vl switches, and the 5300xl switches beginning with software release

E.10.xx, offer two configurable TLVs supporting MED-specific capabilities:

■ medTlvEnable (for per-port enabling or disabling of LLDP-MED opera-

tion)

■ medPortLocation (for configuring per-port location or emergency call

data)

Note LLDP-MED operation also requires the port speed and duplex TLV

(dot3TlvEnable; page 15-46), which is enabled in the default configuration.

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