Configuring the Cisco Discovery Protocol

CDP and Stacks

CDP runs on all media that support Subnetwork Access Protocol (SNAP). Because CDP runs over the data-link layer only, two systems that support different network-layer protocols can learn about each other.

Each CDP-configured device sends periodic messages to a multicast address, advertising at least one address at which it can receive SNMP messages. The advertisements also contain time-to-live, or holdtime information, which is the length of time a receiving device holds CDP information before discarding it. Each device also listens to the messages sent by other devices to learn about neighboring devices.

On the switch, CDP enables Network Assistant to display a graphical view of the network. The switch uses CDP to find cluster candidates and maintain information about cluster members and other devices up to three cluster-enabled devices away from the command switch by default.

CDP and Stacks

A switch stack appears as a single switch in the network. Therefore, CDP discovers the switch stack, not the individual stack members. The switch stack sends CDP messages to neighboring network devices when there are changes to the switch stack membership, such as stack members being added or removed.

Default CDP Configuration

This table shows the default CDP configuration.

 

Feature

Default Setting

CDP global state

Enabled

CDP interface state

Enabled

CDP timer (packet update frequency)

60 seconds

CDP holdtime (before discarding)

180 seconds

CDP Version-2 advertisements

Enabled

How to Configure CDP

Configuring CDP Characteristics

You can configure these CDP characteristics:

Frequency of CDP updates

Amount of time to hold the information before discarding it

Whether or not to send Version-2 advertisements

Note Steps 2 through 4 are all optional and can be performed in any order.

 

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Cisco Systems WSC2960X24PDL, WSC2960X24TDL manual How to Configure CDP, CDP and Stacks, Default CDP Configuration, Feature

WSC2960X24TSL, C2960XSTACK, WSC2960X24PDL, WSC2960X24TSLL, WSC2960X24PSL specifications

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