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BMD00220, October 2010 345
CHAPTER 25
Link Layer Discovery Protocol
The BLADEOS software support Link Layer Discovery Protocol (LLDP). This chapter discusses
the use and configuration of LLDP on the switch:
“LLDP Overview” on page 345
“Enabling or Disabling LLDP” on page 346
“LLDP Transmit Features” on page 347
“LLDP Receive Features” on page 351
“LLDP Example Configuration” on page 353
LLDP Overview
Link Layer Discovery Protocol (LLDP) is an IEEE 802.1AB-2005 standard for discovering and
managing network devices. LLDP uses Layer 2 (the data link layer), and allows network
management applications to extend their awareness of the network by discovering devices that are
direct neighbors of already known devices.
With LLDP, the G8124 can advertise the presence of its ports, their major capabilities, and their
current status to other LLDP stations in the same LAN. LLDP transmissions occur on ports at
regular intervals or whenever there is a relevant change to their status. The switch can also receive
LLDP information advertised from adjacent LLDP-capable network devices.
In addition to discovery of network resources, and notification of network changes, LLDP can help
administrators quickly recognize a variety of common network configuration problems, such as
unintended VLAN exclusions or mis-matched port aggregation membership.
The LLDP transmit function and receive function can be independently configured on a per-port
basis. The administrator can allow any given port to transmit only, receive only, or both transmit
and receive LLDP information.