SCOM Network Discovery - Duplicate nodes with different Device Keys (MAC address)

Hi There,
We have deplyed SCOM 2012 SP1 for server and network monitoring. In the "Network Devices" view, there are few duplicate node entries for the same device. When i look at the details of each entry, the device keys (MAC address) are
different. for example, if there are 3 entires for the same device, only one will have the correct MAC address and remaining 2 are incorrect.
Have anyone came across such issue? Any solution to avoid the duplicates?
Thanks.
Venu.
Best regards, Venu.

Last Thursday (9/25/14), Microsoft provided me with an updated version of a file that is used as part of the discovery process.  At first, it appeared to only resolve the issue for some devices which was disappointing.  On Saturday, I decided
to remove all managed devices and rediscover everything from scratch.  We have 237 devices to monitor.  Since Saturday, I had one ICMP only device duplicate itself, but after I removed the duplicate, I have not had any other duplicates created and
there have been many rediscoveries ru nsince then.  So far so good.  I've asked Microsoft to keep the case open until next Monday.  This weekend, I have a full discovery scheduled to run on a schedule.  I'll feel good after that if there
are still no duplicates.
The file replaced is "ic-iftable.asl" which is located on each management server in the path ""\[ SCOM install directory]\Server\NetworkMonitoring\rules\discovery".  I'm not sure if I'm allowed to share the updated version of
the file.  I have not received an explanation from the support technician yet as to the root cause.  They took at least 5 sets of trace logs during the discovery and subsequent rediscovery process before giving me this updated file.  I'll let
you know.

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