Duplicate MAC Addresses?

Unanswered Question
Jul 9th, 2010
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Hi Folks,


Has anyone experienced duplicate MAC addresss issues with the UCS-B/6120 connected to a 6500?  I'm seeing the following on my 6500:


6506#sh arp | inc 0025    
Internet  10.1.79.60             0   0025.b501.0005  ARPA   Vlan210
Internet  10.1.79.62             4   0025.b501.0007  ARPA   Vlan210
Internet  10.1.79.98            51   0025.b501.0005  ARPA   Vlan210


I checked my profiles and they appear to each have a uniquely assigned MAC address.   The correct entry is 10.1.79.60 and the 6120 should be replying with 0025.b501.006 for 10.1.79.98. 


Anyone got any thoughts on how to correct this issue?


Take Care

Jason

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cpaggen Sun, 07/11/2010 - 04:05
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  • Cisco Employee,

There is nothing wrong with what you're seeing. It's acceptable to have N IP addresses resolve to 1 MAC

address. That is the case with secondary IP addresses for instance, Proxy-ARPing, "plumb" interfaces, etc.

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