Yealink CP860 [263/417] Lldp med media endpoint discovery

Configuring Advanced Features

251

Parameters

Permitted Values

Default

account.1.static_cache_pri = 1

Web User Interface:

None

Phone User Interface:

None

LLDP (Linker Layer Discovery Protocol) is a vendor-neutral Link Layer protocol, which

allows IP phones to receive and/or transmit device-related information from/to directly

connected devices on the network that are also using the protocol, and store the

information about other devices. LLDP transmits information as packets called LLDP

Data Units (LLDPDUs). An LLDPDU consists of a set of Type-Length-Value (TLV) elements,

each of which contains a particular type of information about the device or port

transmitting it.

LLDP-MED (Media Endpoint Discovery)

LLDP-MED is published by the Telecommunications Industry Association (TIA). It is an

extension to LLDP that operates between endpoint devices and network connectivity

devices. LLDP-MED provides the following capabilities for IP phones:

 Capabilities Discovery -- allows LLDP-MED IP phones to determine the capabilities

that the connected switch supports and has enabled.

 Network Policy -- provides voice VLAN configuration to notify IP phones which VLAN

to use and QoS-related configuration for voice data. It provides a “plug and play”

network environment.

 Power Management -- provides information related to how IP phones are powered,

power priority, and how much power IP phones need.

 Inventory Management -- provides a means to effectively manage IP phones and

their attributes such as model number, serial number and software revision.

TLVs supported by IP phones are summarized in the following table:

TLV Type

TLV Name

Description

Mandatory TLVs

Chassis ID

The network address of the phone.

Port ID

The MAC address of the phone.

Time To Live

Seconds until data unit expires.

The default value is 60s.