Alcatel-Lucent 6850-48 ネットワークガイド

Configuring 802.1AB

802.1AB Overview

OmniSwitch AOS Release 6 Network Configuration Guide

page 19-5

• Port VLAN ID TLV

• Port and Protocol VLAN ID TLV 

• VLAN name TLV

• Protocol identity TLV 

Note. If one TLV from this set is included in the LLDPDU, then all TLVs need to be included.

• MAC/PHY configuration/status TLV

• Power Via MDI TLV (In network connectivity TLV set, Extended Power-Via-MDI TLV is supported.)

• Link Aggregation TLV

• Maximum frame size TLV

• Network connectivity TLV set

• LLDP-MED capabilities TLV

• Network Policy TLV 

• Inventory Management TLV

• Location Identification TLV

• Extended Power-via-MDI TLV

When an 802.1AB supporting system receives an LLDPDU containing MED capability TLV, then the 
remote device is identified as an edge device (IP phone, IP PBX, etc.). In such a case the switch will stop 
sending LLDPDU and start sending MED LLDPDU on the port connected to the edge device.

TIA Standard-1057 specifies the Link Layer Discovery Protocol for Media Endpoint Devices. LLDP-
MED is an extension to 802.1ab (Link Layer Discovery Protocol - LLDP), a link-layer protocol that 
defines a method for network access devices using Ethernet connectivity to advertise device information, 
device capabilities and media specific configuration information periodically to peer devices attached to 
the same network. 

The LLDP agent advertises the information over Logical Link-Layer Control Frames and records higher 
layer management reachability and connection endpoint information from adjacent devices. The LLDP 
Agent operates only in advertising mode, and hence doesn't support any means for soliciting information.

LLDP-MED is an enhancement to LLDP that facilitates the information sharing between Endpoint 
Devices and Network Infrastructure Devices. It is designed to allow for the following:

• Auto-discovery of LAN policies (such as VLAN, Layer 2 Priority and Diffserv settings) leading to 

"plug and play" networking.