CHAPTER
24-1
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-07
24
Configuring LLDP and LLDP-MED
This chapter describes how to configure the Link Layer Discovery Protocol (LLDP) and LLDP Media
Endpoint Discovery (LLDP-MED) on the Cisco
ME 3400 switch.
Note 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.
This chapter consists of these sections:
• Understanding LLDP and LLDP-MED, page 24-1
• Configuring LLDP and LLDP-MED, page 24-3
• Monitoring and Maintaining LLDP and LLDP-MED, page 24-8
Understanding LLDP and LLDP-MED
• Understanding LLDP, page 24-1
• Understanding LLDP-MED, page 24-2
Understanding LLDP
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. Details such as configuration information, device capabilities,
and device identity can be advertised using this protocol.
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