A CDP-enabled interface learns about all other CDP-enabled devices on its
LAN, so I'm not sure why you would wonder about it learning about the C5505
and the 1900. CDP messages are sent to a data-link-layer multicast address
that traverses switches. Maybe the 1900 is behind the C5505. Without more
information on your topology, it's hard to give a more definite answer.....
Priscilla
At 03:11 PM 11/28/00, Nabil Fares wrote:
>Greetings,
>
>I've an interesting one for you guys. When I issue a "sh cdp neigh" command
>on a 25XX router, I get 2 devices (WS-C5505 and 1900) on the same E0
>interface. The destination port for the 5505 is 3/8, and the 1900 is B. I
>don't really have physical access to the equipment for visual inspection.
>Could there be a dump hub between the switches? since a dump hub doesn't
>have a MAC address, the cdp protocol is showing both devices instead!
>
>Any help on this one guys is appreciated.
>
>Thanks,
>
>Nabil
>
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Priscilla Oppenheimer
http://www.priscilla.com
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