Chapter 21 Configuring Lldp And Lldp-Med; Understanding Lldp And Lldp-Med; Understanding Lldp - Cisco 3845 - Security Bundle Router Software Manual

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 3800X and ME 3600X switch.
For complete syntax and usage information for the commands used in this chapter, see the command
Note
reference for this release and the "System Management Commands" section in the Cisco IOS
Configuration Fundamentals Command Reference, Release 12.2.
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Understanding LLDP and LLDP-MED

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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.
By default, LLDP is disabled globally and on interfaces.
OL-23400-01
Understanding LLDP and LLDP-MED, page 21-1
Configuring LLDP and LLDP-MED, page 21-3
Monitoring and Maintaining LLDP and LLDP-MED, page 21-7
Understanding LLDP, page 21-1
Understanding LLDP-MED, page 21-2
C H A P T E R
Cisco ME 3800X and 3600X Switch Software Configuration Guide
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