Reference Guide

Link Layer Discovery Protocol (LLDP) | 549

Link Layer Discovery Protocol (LLDP)

Link Layer Discovery Protocol (LLDP) is supported only on the S5000 switch.

This chapter contains the following sections:

• 802.1AB (LLDP) Overview

• Optional TLVs

• TIA-1057 (LLDP-MED) Overview

• Configuring LLDP

• Advertising TLVs

• Viewing the LLDP Configuration

• Viewing Information Advertised by Adjacent LLDP Agents

• Configuring LLDPDU Intervals

• Configuring Transmit and Receive Mode

• Configuring a Time to Live

• Debugging LLDP

• Relevant Management Objects

802.1AB (LLDP) Overview

Link Layer Discovery Protocol (LLDP)—defined by IEEE 802.1AB—is a protocol that enables a LAN

device to advertise its configuration and receive configuration information from adjacent LLDP-enabled

LAN infrastructure devices. The collected information is stored in a management information base (MIB)

on each device, and is accessible via SNMP.

Protocol Data Units

Configuration information is exchanged in the form of Type, Length, Value (TLV) segments. Figure 28-1

shows the Chassis ID TLV.

•Type—The kind of information included in the TLV

•Length—The value, in octets, of the TLV after the Length field

•Value—The configuration information that the agent is advertising