I found this on Ciscos pages -
CDP sends packets on LANs using the multicast address 0100.0CCC.CCCC.
So maybe that will help if you can set up an ACL by MAC address. But, I am
pretty sure that if you turn off CDP on a router it will not respond to CDP
requests from neighbor routers. I couldn't find anything on the web to
verify this, but it should be pretty easy to test out.
hope that helps
mike
>
>I know you can turn off CDP completely however I do not believe it can be
>blocked by an IP access-list as it runs at layer 2.
>If I am wrong, I am sure I will be corrected here, but I am pretty sure
>that
>is accurate based on the fact that CDP uses layer 2.
>
>
>----- Original Message -----
>From: "Aaron Prather" <[EMAIL PROTECTED]>
>To: <[EMAIL PROTECTED]>
>Sent: Tuesday, June 27, 2000 5:58 PM
>Subject: Can you block CDP with an access list???
>
>
> > 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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