Lldp Overview - Juniper ACX1000 Configuration Manual

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LLDP Overview

Copyright © 2017, Juniper Networks, Inc.
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NOTE: This is not a complete configuration.
Understanding Root Protection for Spanning-Tree Instance Interfaces in a Layer 2
Switched Network on page 429
The Link Layer Discovery Protocol (LLDP) is an industry-standard, vendor-neutral method
to allow networked devices to advertise capabilities, identity, and other information onto
a LAN. The Layer 2 protocol, detailed in IEEE 802.1AB-2005, replaces several proprietary
protocols implemented by individual vendors for their equipment.
LLDP allows network devices that operate at the lower layers of a protocol stack (such
as Layer 2 bridges and switches) to learn some of the capabilities and characteristics of
LAN devices available to higher layer protocols, such as IP addresses. The information
gathered through LLDP operation is stored in a network device and is queried with SNMP.
Topology information can also be gathered from this database.
Some of the information that can be gathered by LLDP (only minimal information is
mandatory) is:
System name and description
Port name and description
VLAN name and identifier
IP network management address
Capabilities of the device (for example, switch, router, or server)
MAC address and physical layer information
Power information
Link aggregation information
NOTE: LLDP media endpoint discovery (LLDP-MED) is not supported on T
Series routers.
LLDP frames are sent at fixed intervals on each port that runs LLDP. LLDP protocol data
units (LLDP PDUs) are sent inside Ethernet frames and identified by their destination
Media Access Control (MAC) address (
Mandatory information supplied by LLDP is chassis ID, port ID, and a time-to-live value
for this information.
Chapter 12: Configuring Layer 2 Control Protocol
01:80:C2:00:00:0E ) and Ethertype ( 0x88CC ).
431