Link Layer Discovery Protocol (Lldp); Overview; Protocol Data Units - Dell Force10 MXL Blade Configuration Manual

Link Layer Discovery Protocol (LLDP)

This chapter contains the following sections:
•

Overview

• TIA-1057 (LLDP-MED) Overview
• Configuring LLDP
Overview
Link layer discovery protocol (LLDP)—defined by IEEE 802.1AB—is a protocol that enables a local area
network (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 a simple network management protocol
(SNMP).

Protocol Data Units

Configuration information is exchanged in the form of type, length, value (TLV) segments.
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
Figure 18-1. Type, Length, Value (TLV) Segment
TLV Header
TLV Type TLV Length
Value
(1-127)
7 bits 9 bits
0-511 octets
Chassis ID Sub-type
1 octet
Chassis ID
fnC0057mp
1- 255 octets
Link Layer Discovery Protocol (LLDP) | 313
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Figure 18-1