Actually, that's not 100% true. I don't know all the reasoning behind it,
and perhaps a Cisco switch can be told to forward CDP, but in 2 cases just
today I saw that CDP info did not make it through Cisco CATs (I could see
the CAT, but not the other routers connected to it, even though we were on
the same subnet). For non-CDP aware switches, your statement is true of
course.
--
Jason Roysdon, CCNA, MCSE, CNA, Network+, A+
List email: [EMAIL PROTECTED]
Homepage: http://jason.artoo.net/
Cisco resources: http://r2cisco.artoo.net/
"Priscilla Oppenheimer" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> 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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