Cisco Systems 3560 사용자 설명서

This chapter describes how to configure the Link Layer Discovery Protocol (LLDP), LLDP Media 
Endpoint Discovery (LLDP-MED) and wired location service on the Catalyst 3560 switch.

For complete syntax and usage information for the commands used in this chapter, see the command 
reference for this release and the “System Management Commands” section in the Cisco IOS 
Configuration Fundamentals Command Reference, Release 12.2.

The Cisco Discovery Protocol (CDP) is a device discovery protocol that runs over Layer 2 (the data link 
layer) on all Cisco-manufactured devices (routers, bridges, access servers, and switches). CDP allows 
network management applications to automatically discover and learn about other Cisco devices 
connected to the network. 

To support non-Cisco devices and to allow for interoperability between other devices, the switch 
supports the IEEE 802.1AB Link Layer Discovery Protocol (LLDP). LLDP is a neighbor discovery 
protocol that is used for network devices to advertise information about themselves to other devices on 
the network. This protocol runs over the data-link layer, which allows two systems running different 
network layer protocols to learn about each other. 

LLDP supports a set of attributes that it uses to discover neighbor devices. These attributes contain type, 
length, and value descriptions and are referred to as TLVs. LLDP supported devices can use TLVs to receive 
and send information to their neighbors. This protocol can advertise details such as configuration 
information, device capabilities, and device identity.