This wiki has been migrated to and is now deprecated. Please use that site instead.
Differences between revisions 1 and 2
Revision 1 as of 2005-10-19 07:43:06
Size: 1747
Editor: GuyHarris
Comment: Add quick first cut at CDP page, based on "Protocols/cdp" page.
Revision 2 as of 2005-10-19 07:57:51
Size: 1903
Editor: GuyHarris
Comment: Add Cisco links for CDP.
Deletions are marked like this. Additions are marked like this.
Line 47: Line 47:
 * add link to CDP specification and where to find additional info on the web about it, e.g.:  * [ CDP packet format information]
 * [ Some additional CDP information]

Cisco Discovery Protocol (CDP)

CDP (Cisco Discovery Protocol) is a Cisco proprietary protocol that runs between direct connected network entities (routers, switches, remote access devices, firewalls, etc.). The purpose of the protocol is to supply a network entity with information about its direct connected neighbors.


XXX - add a brief description of CDP history

Protocol dependencies

  • ["LLC"]: Typically, CDP uses ["LLC"] as its transport protocol. SNAP, Cisco OUI, PID, etc.

Example traffic

XXX - Add example traffic here (as plain text or Ethereal screenshot).


The CDP dissector is (fully functional, partially functional, not existing, ... whatever the current state is). Also add info of additional Ethereal features where appropriate, like special statistics of this protocol.

Preference Settings

(XXX add links to preference settings affecting how CDP is dissected).

Example capture file

XXX - Add a simple example capture file to the SampleCaptures page and link from here (see below). Keep this file short, it's also a good idea to gzip it to make it even smaller, as Ethereal can open gzipped files automatically.

  • attachment:SampleCaptures/cdp.pcap

Display Filter

A complete list of CDP display filter fields can be found in the [ display filter reference]

  • Show only the CDP based traffic:


Capture Filter

XXX - filter for SNAP OUI/PID pair?

  • Capture only the CDP traffic:



CDP (last edited 2013-05-06 19:20:28 by clementc)