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VMSMP EventID 28

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VMSMP EventID 28

Postby guest » Wed Mar 16, 2011 10:32 pm

I have a Windows 2008 R2 DC Hyper-V server that this weekend decided to give us a BSOD.

After recovering the server reports a lot of VMSMP EvenID 28: Port 'SWITCHPORT-SM-A6285CC8-5521-4180-BEE9-59C9929D26CB-1-1' was prevented from using MAC address '00-15-5D-64-3A-16' because it is pinned to port '27263E05-4CB3-4751-9' in the eventlog. Always this MAC address.

I found the virtual server that has this MAC address set in the settings. However all our servers, including this one, use dynamic MAC addresses. I do not know if it is better to set them static or not but that is not the issue. The server that has this MAC address set to is not accessable on that virtual NIC from the outside. I can send a ping to any virtual machine on that psysical server but to no other server on the network.

So connectivity ends at the virtual switch.

I searched the internet but it seems not a widespread problem. Has anybody experienced this problem also. How did you fix this?


Thnx in advance

Update:
I got a message that http://social.technet.microsoft.com/For ... aafa8b86da might help. In it is a link to http://blogs.technet.com/jhoward/archiv ... cause.aspx. This seems to be the solution. I changed the MAC address and not connectivity is restored.
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Re: VMSMP EventID 28

Postby guest » Wed Mar 16, 2011 10:34 pm

This is not an error but a Warning. By the way, how often does it happen? Is something “not working” because of the Warning?

The following event means that the switch port to which this machine is connected is preventing to assign that MAC address for the NIC of the machine. This sometimes happens if MAC addresses for the machine are being assigned dynamically. It's possible that another Hyper-V VM is plugged to the same switch and generated similar MAC address. You might want to assign an alternate static MAC address for this VM.


The event might be a warning. However it still is an error as the interface is not working and I thing Hyper-V should check if the MAC it is assigning to an interface is being used on the network. I fixed it by modifing the MAC address to an other fixed address. I found that I had a second Hyper-V server which uses the same range of MAC addresses. On that server I also got messages about the same MAC address. After changing the MAC address on the first server all messages disappeared.

That I could not connect to the second server with the same MAC address might be that our Cisco PIX blocked access due to the same MAC address.

Frank
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