LLDP Configuration
Chapter 30. LLDP Configuration
30.1 LLDP Protocol Overview
LLDP (Link Layer Discovery Protocol), a L2 protocol, defined by IEEE802.1AB-2005
standard has nothing to do with the manufacturer. It announces its information to other
neighbor devices in the network, receives the neighbor’s information and saves to standard
MIB of LLDP for users to check the downlink devices and connected ports for easy network
maintenance and management. Network administrator can know L2 connections by
accessing.
LLDP Fundamentals
LLDP devices announce their own information through multicast address
01-80-c2-00-00-0e. LLDP devices will send 2 LLDP notice and the sending interval is set by
hello-time. After receiving neighbor’s advertisement, LLDP device will read the advertisement
content and save in LLDP neighbor table. LLDP neighbor table can be aged with TTL value
being aging time. If neighbor’s LLDP advertisement cannot be received within aging time, the
neighbor entry will be removed.
LLDP timer
Hello-time: The time interval for sending LLDP packet.
Hold-time: LLDP aging time granularity for neighbor entry.
TTL: TTL equals to hello-time ties hold-time which means aging time of neighbor entry.
30.2 Configure LLDP
30.2.1 LLDP Configuration Task
Table 30-1 LLDP configuration task
Configure LLDP Hello-time
Configure LLDP packet sending
& receiving mode
LLDP display and debugging
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