Link Layer Discovery Protocol (Lldp) - Nokia 7210 Configuration Manual

7210 SAS-M, T, R6, R12, Mxp, Sx, S Basic System
Configuration Guide

6.7 Link Layer Discovery Protocol (LLDP)

The IEEE 802.1ab Link Layer Discovery Protocol (LLDP) is a unidirectional protocol
that uses the MAC layer to transmit specific information about the capabilities and
status of the local device. The LLDP can send as well as receive information from a
remote device stored in the related MIB (or MIBs).
The LLDP does not contain a mechanism to solicit information received from other
LLDP agents or to confirm the receipt of information. However, LLDP provides the
flexibility to enable a transmitter and receiver separately, and the following LLDP
agent configurations are allowed:
The information fields in each LLDP frame are contained in an LLDP Data Unit
(LLDPDU) as a sequence of variable length information elements. Each information
element includes Type, Length, and Value fields (TLVs).
Each LLDPDU contains four mandatory TLVs and optional TLVs selected by the
Network Management. The following is the format of an LLDPDU:
A concatenated string formed by the Chassis ID TLV and the Port ID TLV is used by
a recipient to identify an LLDP port or agent. The combination of the Port ID and
Chassis ID TLVs remains unchanged until the port or agent is operational.
3HE 17358 AAAB TQZZA
• only transmit information
• only receive information
• transmit and receive information
• Type indicates the nature of information being transmitted.
• Length indicates the length of the information string in octets.
• Value is the actual information that is transmitted. (For example, a binary bit map
or an alphanumeric string that can contain one or more fields).
• Chassis ID TLV
• Port ID TLV
• Time To Live (TTL) TLV
• zero or more optional TLVs, depending on the maximum size of the LLDPDU
allowed
• End of LLDPDU TLV
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