Reference Guide

Example
OS10# show lacp system-identifier
Actor System ID: Priority 32768, Address 90:b1:1c:f4:9b:8a
Supported
Releases
10.2.0E or later
Link Layer Discovery Protocol
LLDP enables a LAN device to advertise its system and receive system information from adjacent LAN devices.
● LLDP is enabled by default on OS10 interfaces.
● An LLDP-enabled interface can support up to eight neighbors. An OS10 switch supports a maximum of 250 total neighbors
per system.
● OS10 devices receive and periodically transmit Link Layer Discovery Protocol Data Units (LLDPDUs), which are data packets.
The default transmission interval is 30 seconds.
● LLDPDU information received from a neighbor expires after the default time to live (TTL) value (120 seconds).
● Spanning-tree blocked ports allow LLDPDUs.
● 802.1X-controlled ports do not allow LLDPDUs until the connected device is authenticated.
● Link layer discovery protocol-media endpoint discovery (LLDP-MED) is enabled on all interfaces by default.
Protocol data units
LLDP devices exchange system information represented as type, length, and value (TLV) segments:
Type
Information included in the TLV.
Length Value (in bytes) of the TLV after the Length field.
Value System information the agent is advertising.
LAN devices transmit LLDPDUs, which encapsulate TLVs, to neighboring LAN devices. LLDP is a one-way protocol and LAN
devices (LLDP agents) transmit and/or receive advertisements but they cannot solicit and do not respond to advertisements.
There are three mandatory TLVs followed by zero or more optional TLVs and the end of the LLDPDU TLV. The three mandatory
TLVs must be located at the beginning of the LLDPDU in the following order:
● Chassis ID TLV
● Port ID TLV
● Time-to-live TLV
0 — End of
LLDPDU
Marks the end of an LLDPDU.
1 — Chassis ID Identifies the LAN agent.
2 — Port ID Identifies a port through which the LAN device transmits LLDPDUs.
170 Layer 2