HP 9304m - Chapter 9 Readingciscodiscoveryprotocol(Cdp) Packets...........................9-1 Enabling Interception of Cdp Packets...............................................................................................9-1; Displaying Cdp Information

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Chapter 9
Reading Cisco Discovery Protocol (CDP) Packets
Cisco Discovery Protocol (CDP) packets are used by Cisco devices to advertise themselves to other Cisco
devices. By default, HP devices forward these packets without examining their contents. You can configure an HP
device to intercept and display the contents of CDP packets. This feature is useful for learning device and
interface information for Cisco devices in the network.
NOTE: When you enable interception of CDP packets, the HP device drops the packets. As a result, Cisco
devices will no longer receive the packets.
Enabling Interception of CDP Packets
To enable the HP device to intercept and display CDP packets, enter the following command at the global CONFIG
level of the CLI:
HP9300(config)# cdp run
Syntax: [no] cdp run
The feature is disabled by default.
Displaying CDP Information
You can display the following CDP information:
• Cisco neighbors
• CDP entries for all Cisco neighbors or a specific neighbor
• CDP packet statistics