again..... read up.... udp=layer 4
cdp=NOT layer 4
.... in fatto: cdp is cisco's implementation of stretching layer 2 rules.
The Cisco Discovery Protocol (CDP) Discovery Protocol
CDP allows devices to share basic configuration information without even
configuring any protocol
specific information. CDP is enabled by default on all interfaces.
CDP is a Datalink Protocol occuring at Layer 2 of the OSI model. This is
important to understand
because CDP is not routable. It can only traverse to directly connected
devices.
CDP allows you to view information such Operating System Version, Protocol
Information, and much
more. This can be very handy for troubleshooting a variety of problems.
Aaron Prather wrote:
> If you can what protocol does it use? UDP? i know its a protocol in
> itself, but can this be done? what port number?
>
> Thanks guys,
>
> Aaron
>
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