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Configuring CDP
This chapter describes how to configure the Cisco Discovery Protocol (CDP) on the Catalyst enterprise
LAN switches.
Note
For complete syntax and usage information for the commands used in this chapter, refer to the Command
Reference—Catalyst 4000 Family, Catalyst 2948G, and Catalyst 2980G Switches.
This chapter consists of these sections:
•
•
•
Understanding How CDP Works
CDP is a media- and protocol-independent protocol that runs on all Cisco-manufactured equipment
including routers, bridges, access and communication servers, and switches. Using CDP, you can view
information about all the Cisco devices directly attached to the switch. In addition, CDP detects native
VLAN and port duplex mismatches.
Network management applications can retrieve the device type and SNMP-agent address of neighboring
Cisco devices using CDP. This allows applications to send SNMP queries to neighboring devices. CDP
allows network management applications to discover Cisco devices that are neighbors of already known
devices, in particular, neighbors running lower-layer, transparent protocols.
CDP runs on all media that support Subnetwork Access Protocol (SNAP). CDP runs over the data link
layer only.
Cisco devices do not forward CDP packets. When new CDP information is received, old information is
discarded.
Default CDP Configuration
Table 20-1
78-12647-02
Understanding How CDP Works, page 20-1
Default CDP Configuration, page 20-1
Configuring CDP, page 20-2
shows the default CDP configuration.
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
C H A P T E R
20
20-1
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Troubleshooting
