Administrator Guide
Link Layer Discovery Protocol (LLDP)
This chapter describes how to configure and use the link layer discovery protocol (LLDP).
Topics:
• 802.1AB (LLDP) Overview
• Optional TLVs
• TIA-1057 (LLDP-MED) Overview
• Configure LLDP
• CONFIGURATION versus INTERFACE Configurations
• Enabling LLDP
• Enabling LLDP on Management Ports
• Advertising TLVs
• Storing and Viewing Unrecognized LLDP TLVs
• Viewing the LLDP Configuration
• Viewing Information Advertised by Adjacent LLDP Neighbors
• Configuring LLDPDU Intervals
• Configuring LLDP Notification Interval
• Configuring LLDP Notification Interval
• Configuring Transmit and Receive Mode
• Configuring the Time to Live Value
• Debugging LLDP
• Relevant Management Objects
802.1AB (LLDP) Overview
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 simple
network management protocol (SNMP).
Protocol Data Units
Configuration information is exchanged in the form of Type, Length, Value (TLV) segments.
● 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.
The chassis ID TLV is shown in the following illustration.
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440 Link Layer Discovery Protocol (LLDP)