LLDP

This chapter the Link Layer Discovery Protocol (LLDP) chapter, which describes how the router uses IEEE 802.1AB LLDP as a neighbor discovery protocol to advertise device information over Layer 2, explains features, such as LLDP frame and TLV formats, user-defined TLV values, LLDP operation, and so on.

Link Layer Discovery Protocol

Introduces the IEEE 802.1AB Link Layer Discovery Protocol (LLDP), which the router supports in addition to Cisco Discovery Protocol (CDP) to enable interoperability with non-Cisco devices.

Enable LLDP globally

Enable LLDP on the router at the global level so that all interfaces that support LLDP are automatically enabled for both transmit and receive operations, and configure the LLDP holdtime, reinit, and timer attributes to control the neighbor holdtime, initialization delay, and packet rate.

Enable LLDP per interface

This topics describes how to enable LLDP on a specific interface so that LLDP transmit and receive operations run only on the interfaces where you have activated LLDP explicitly.

Configure global LLDP operational characteristics

This topic describes how to modify the default global LLDP operational characteristics on the router, such as the LLDP neighbor information holdtime, the LLDP initialization delay for an interface, and the LLDP packet rate.

Disable transmission of optional LLDP TLVs

This topic describes how to suppress transmission of certain optional LLDP TLVs.

Disable LLDP receive and transmit operation for an interface

This topic describes how to override the default behavior of LLDP on a specific interface by disabling the LLDP receive operation, transmit operation, or both.

Enable LLDP snoop

This topic describes how to enable Link Layer Discovery Protocol (LLDP) snoop on an L2 interface to troubleshoot problems at the client ports.

LLDP interface configuration verification

Verify the LLDP interface status and configuration using the show lldp interface command, monitor and maintain LLDP on the system with commands such as clear lldp counters, show lldp entry, show lldp errors, show lldp neighbors, and show lldp traffic, and collect or clear LLDP interface statistics with the show lldp traffic interface and clear lldp counters interface commands.