Hi John,

we have similar problems from time to time.

As the letter "N" indicates, the problem is discovered by netmon and
it's no trap from the cisco box. Netmon once has discovered these
addresses on some interfaces, and now discovered them again on some
other cisco box.

The reason may be:

1. you moved already existing addresses to a new box. You should
demand-poll the box previously owning these addresses and make sure they
are no longer configured on the box (eg. interface shutdown, but
ip-address still configured). When you are sure they are no longer in
the netview database (use ovtopodump and fgrep for them, maybe ovtopofix
-a and ovmapcount -a) you can add / discover the new boxes, and there
should be no problem.

2. if you moved the addresses like described above, there is the
possibillity that Netview didn't recognize those addresses are no longer
on the old box, even after the demand-poll. We have an PMR open for
NV5.0 for this case.

3. your cisco-devices are not configured correctly, and the event
describes the error.


Michael


--
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| debis Systemhaus GmbH   |
| Michael Seibold         |
| Germany                 |
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John Mutrux wrote:
>
> We have installed new Cisco 5500's in our network.  We're using VLANs.  I
> am receiving a ton of Duplicate IP address messages now - every so often.
> The format is:
>
> (date) (time) 10.4.80.254   N Duplicate IP address 10.4.5.253 on
> 10.4.80.254 and 20.4.105.253.
> (date) (time) 10.4.80.254   N Duplicate IP address 10.4.6.253 on
> 10.4.80.254 and 20.4.105.253.
> (date) (time) 10.4.80.254   N Duplicate IP address 10.4.10.253 on
> 10.4.80.254 and 20.4.105.253.
> etc......
>
> Is this a NetView problem or Cisco switch problem??