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Event id 28 VMSMP SCVMM MAC address

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Event id 28 VMSMP SCVMM MAC address

Postby guest » Mon Dec 27, 2010 6:53 pm

I recently come accross this problem myself and thought I would share it as other users seem to be getting the problem.

The event log fills with event 28 saying the MAC address is blocked because it assigned to SCVMM.
After some investigation I found a tutorial about dynamic MAC addressess in Hyper-V on a Microsoft blog :-
http://blogs.technet.com/jhoward/archiv ... cause.aspx

In my case the problem was caused because I had done a P2V conversion, switched off the Physical machine and left it off but then a few weeks later setup the physical machine as another server.

What had happened is that the P2V had taken the MAC address from the physical server and applied it to the virtual machine (there lies the problem), then when I reconfigured the physical machine and added it to the network I started getting network problems.

Solution :- Use a dynamically assigned MAC address from the pool Hyper-V allocates for VM's by changing the properies of the VM before you boot it up.

This problem can also happen in Microsoft Virtual Server, it is not related just to Hyper-V.

Hope this helps someone out there.

Regards PJ
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Re: Event id 28 VMSMP SCVMM MAC address

Postby guest » Mon Dec 27, 2010 6:54 pm

I also met similar issue...

But, Microsoft suggest to use static mac address instead of dynamic's in order to avoid MAC address conflict.

So, it's better to generate one new static mac address for your virtual machine.


--------------------------------------------------------------------------------
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Re: Event id 28 VMSMP SCVMM MAC address

Postby guest » Mon Dec 27, 2010 6:54 pm

You guys are so awesome!! This was the strangest issue all day today. Connectivity between the P2V server and the physical server would "float" back and forth, I was totally stumped until I saw this error in the event viewer.

Thansk for taking the time to post this comment, very helpful!

CHad
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Re: Event id 28 VMSMP SCVMM MAC address

Postby guest » Mon Dec 27, 2010 6:54 pm

Pj,

Thanks for this post. This gave me the info to solve a strange performance problem on a physical server - just as you noted - redeployed after a P2V conversion. 'My Computer' was very slow to come up, and sometimes didn't, and pinging other servers was hit and miss. Fixing my converted VM solved what seemed like an unrelated problem.

Jim
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Re: Event id 28 VMSMP SCVMM MAC address

Postby guest » Mon Dec 27, 2010 7:07 pm

We have solved this problem by deleting the external Network in Hyper-V. Deleteting the Team.Config on our Intel-Network-Cards (on your Virutal Host) (Pro/1000 PT Dualportadapters are not VLAN supportet) and Reboot your Server.

Next, create a new Team (use Fault-Tolerance! and not Virtual-Server Loadbalancign Mode for Team)

Create new external Network in Hyper-V and use the new Team-Adapter.

Now apply the new Network on the virtual-Clients und configure the V-LAN. While booting up, no errors should be written to the System-Log of your virutal-Host System.
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Re: Event id 28 VMSMP SCVMM MAC address

Postby guest » Mon Dec 27, 2010 7:08 pm

I hade the same Problem. As additional information: We are using Intel Pro/1000 PT Dualportadapters configured as a TEAM. Team-Setting = "Virtual Machine Loadbalancing"

(From a Intel White-Paper: Those Nics dont support V-Lan Config. on virtualisation)

We changed the TEAM-Setting to "Switch Fault Tolerance"

And the Warnings in the System-Log are gone!
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Re: Event id 28 VMSMP SCVMM MAC address

Postby guest » Mon Dec 27, 2010 7:52 pm

I experience the same problem and found out what was wrong, I have 2 Hyper-V server setup for one of my costume, this error begin to pop up in the event log, i found out that the global MAC Network settings is the same for Both Hyper-V server, so by change the MAC in the Virtual networks manager, the error 28 stop running on both server, you will also need to reset you network card, to make it work.
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Re: Event id 28 VMSMP SCVMM MAC address

Postby guest » Wed Dec 29, 2010 11:51 am

We setup two physical servers for clustering. Each host has 1 NIC for management, 2 NICs for iSCSI, 3 NICs configured as teaming for VM. Each Host has 2 VM, for example exch-cas01 and exch-mail02. The HPV-Dell01 works fine. However, the HPV-Dell02 keeps logging this warning:

Log Name: System

Source: VMSMP

Date: 12/27/2010 5:16:33 PM

Event ID: 28

Task Category: None

Level: Warning

Keywords: Classic

User: N/A

Computer: HPV-DELL02

Description:

Port '8683DA1C-2A40-4D65-B7E4-D3C88ACE2244' was prevented from using MAC address '00-15-5D-00-93-00' because it is pinned to port 'E6DF37EC-36CC-4641-90F0-85D3FF51B2AC'.


Exch-mail02 on hpv-dell02 keeps having network issue. We can’t access it or ping it until reboot. Then after a few days, no one can ping it. If we can logon it from Hyper-V management, we find the NIC is disabled and can’t enable it. The only solution is rebooting the VM. Other VMs, exch-cas02 on hpv-dell02, exch-mail01 and exch-cas01 on hpv-dell01 don’t have this issue. I try to compare both servers’ network configuration, can’t find the difference. Any tools we can use to troubleshoot this issue?
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Re: Event id 28 VMSMP SCVMM MAC address

Postby guest » Wed Dec 29, 2010 11:51 am

Based on the description, this issue can occur when NIC teaming software is set for Load Balance. This is due to some type of Loopback packet that the teaming software may do to see which NIC will send out the packets on the wire . So you will not see anything in a network trace as this seems occur before the nic send out the packets on the wire, but VMSMP detects this and logs an Event ID 28.

Would you please set the NIC teaming software from Load Balancing to failover and check if the issue is still there? Thanks.
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