Configuring 802.1AB 802.1AB Overview
OmniSwitch AOS Release 6 Network Configuration Guide September 2009 page 19-5
IEEE 802.1 Organizationally Specific TLV Set
• 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.
IEEE 802.3 Organizationally Specific TLV Set
• 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
ANSI-TIA LLDP-MED TLV Sets
• 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.
LLDP-Media Endpoint Devices
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.
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