Nexus 7000 OTV with 5.0(3) - not recognizing mac address

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Aug 13th, 2010
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We are running a Nexus 7000 OTV with 5.0(3) - it is not recognizing the mac address of a machine we have plugged in to an eth port.  It is also negotiating down to 10 full.  even though this windows machine has a 10/100/1000 nic.  I feel as though something might be wrong with the windows box of course, but can not get to it physically for a couple of days and it is the only machine in the extended vlan. 

Anyone have any issues with a machine that is showing as UP but not registering its mac withthe nexus?  It is receiving packets also but not sending them.

thx in adv

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oyassin Wed, 08/18/2010 - 10:11
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Looks like the problem is not directly related to OTV. So:

  • is the Windows machine directly connected to the Edge device?
  • If you check the port counters or run a sniffer on the Windows machine, do you see any packets sent by the latter?
  • Do you have a L3 interface for that vlan? If so, do you see an arp entry for the Windows machine IP address?
  • Lastest NIC card driver is installed?

you can use the following command to check the mac address table on the linecard:

show hardware mac address-table address

If there is no entry, then you need to investigate the Windows machine.



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