Aaron/Erick,
I believe that CDP uses ARPA code 0x2000 so you
could try the following.
access-list 200 deny 0x2000
although I don't understand why you would want to do
this. It is an extremely useful tool that uses minimal
b/w.
Phil.
--- Erick <[EMAIL PROTECTED]> wrote: > Hi again,
>
> I tried blocking it going out the router with ACL
> but
> didn't succeed. I think this is because you can only
> apply MAC-address ACLs to certain objects (bridge
> groups, etc) and my lab setup isn't setup right to
> really see if this works.
>
> CDP uses 01000C-CCCCCC which is a Multicast MAC.
>
> Below is the config I thru together which wasn't
> working from sniffer traces I was doing on my
> ethernet
> segment. As others have said, disable CDP on the
> interface (no cdp enable) so the information isn't
> advertised. Lots of useful information can be
> learned
> from sniffing a segment and looking at CDP packet
> entries :)
>
> interface Ethernet0
> ip address 192.168.1.2 255.255.255.0
> bridge-group 1
> bridge-group 1 output-address-list 701
> !
>
> access-list 701 deny 0000.0000.0000 0100.0ccc.cccc
> (I reversed this and also tried extended)
>
> --- Aaron Prather <[EMAIL PROTECTED]>
> 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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