Is this Token Ring? The first bit of the source address is set to one when 
source-routing is used. So 00 becomes 80.

Priscilla

At 06:59 AM 1/5/01, John Neiberger wrote:
>Take a closer look at the actual MAC addresses. Change the order and you'll
>see it:
>
>00-c0-4f-a9-05-92
>80-c0-4f-a9-05-92
>
>00-c0-4f-62-34-de
>80-c0-4f-62-34-de
>
>It appears that the NICs in the PCs are advertising two addresses each, one
>starting with 00 and the other starting with 80. I've never seen anything
>like this so I have no suggestions.  Perhaps two different protocols are
>bound to the NICs and they prefer to use separate datalink addresses?  I
>don't even know if that is possible.
>
>Is it possible to bind two different IP addresses to the same NIC? Not being
>much of a PC guy, I can't tell you.  I'd love to hear how this one turns
>out.
>
>Good luck,
>John
>
> >  Hi,
> >
> >  Can anyone explain this:
> >  Little testcase. One port of a Cat.5500(WS-X5224)  is connected to a hub.
>No
> >  other ports are in use.
> >  On this hub are 2 PC's. When I look at the CAM table I see the folowing
> >  entry's
> >
> >   Switch> (enable) sh cam dyn 5/13
> >
> >     VLAN  Dest MAC/Route Des  Destination Ports or VCs / [Protocol Type]
> >     ----  ------------------
>-----------------------------------------------
> >  -----
> >     80    00-c0-4f-a9-05-92   5/13 [ALL]
> >     80    80-c0-4f-62-34-de   5/13 [ALL]
> >     80    00-c0-4f-62-34-de   5/13 [ALL]
> >     80    80-c0-4f-a9-05-92   5/13 [ALL]
> >     Total Matching CAM Entries Displayed = 4
> >
> >  Can anyone explain where the extra entry's starting with 80-xx-xx-xx-xx
>are
> >  coming from?
> >  I would expect to see only the 2 entry's for the PC's.
> >
> >  Regards Richard
> >
> >
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>
>
>
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________________________

Priscilla Oppenheimer
http://www.priscilla.com

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