ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby Vitaliy S. » Thu Mar 03, 2016 11:44 am

The alert gets triggered on the initial run, after the collision is detected, vCenter Server changes the MAC address of the VM that's why it doesn't match with the original one.
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby B.F. » Fri Mar 04, 2016 2:01 pm

Acknowledging and clearing the alarm only makes it come back after the next replication. Perhaps there's a way to have vSphere only check for MAC conflicts after replication is completed?
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby Vitaliy S. » Fri Mar 04, 2016 2:04 pm

Cannot find this option, but as a temporary workaround you can try to exclude source VMs from this alarm.
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby B.F. » Fri Mar 04, 2016 2:45 pm

OK I can try that. Maybe a Veeam feature request would be that Veeam changes the replica's MAC before it completes somehow in midstream? (If that is even possible.) It sounds like vSphere is able to check the replica MAC before Veeam has a chance to make the change.
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby Vitaliy S. » Fri Mar 04, 2016 2:49 pm

Unfortunately, Veeam cannot change MAC address of the VM, as it is the vCenter Server/ESXi host that manages that.
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby B.F. » Fri Mar 04, 2016 2:53 pm

So MAC changes to the replica is actually done / managed by VMWare? If so, time to pile on VMWare's forums?
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby B.F. » Fri Mar 04, 2016 3:29 pm

Don't know if this helps but we have a large VM that takes quite a while for the snapshot to be removed after replication is completed. I'm now seeing a replica of that VM with no alarms triggered while it's in "Remove snapshot" mode. I'm assuming as soon as it's done, the alarm with be triggered.
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby Vitaliy S. » Fri Mar 04, 2016 4:14 pm

B.F. wrote:So MAC changes to the replica is actually done / managed by VMWare? If so, time to pile on VMWare's forums?

When VM replica is created is should be identical to the source VM, after that VMware tries to resolve all conflicts and raises the alarm if it detects some collisions. Maybe there is a way to tweak alarm detection.
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby mloeckle » Fri Mar 11, 2016 10:55 pm 6 people like this post

This worked for me. All our replica VMs end with the default suffix "_replica". So I added a Trigger Condition to each of the Alarm Triggers (VM MAC conflict, VM static MAC conflict). Value = "VM name", Operator = "does not end with", and Value = "_replica".
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby Vitaliy S. » Sun Mar 13, 2016 12:17 pm

Perfect! In Veeam ONE we have an ability to make exclusions for all replicas too.
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby B.F. » Mon Mar 14, 2016 6:52 pm

Adjusted our alarm...now we wait....

Thanks
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby ITP-Stan » Wed Jun 08, 2016 7:37 am

Thanks mloeckle!
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[MERGED] VM MAC Conflict

Veeam Logoby lowlander » Thu Jun 23, 2016 11:28 am

Hi,

we are in the proces of upgrading our VMWare farm. When replicating between vSphere 5 and 6 we now receive an alarm on the target replica : VM MAC Conflict. Is this expected behaviour ?

thanks !
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby PTide » Thu Jun 23, 2016 11:42 am

Hi,

Yes, that's an expected behaviour. Please review the thread to see possible solutions. Also this KB and this blogpost might be helpful.

Thanks
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Re: ESXi 6.0 U1b - VM MAC Conflict alarm on Veeam Replicas

Veeam Logoby lowlander » Thu Jun 23, 2016 12:04 pm

Superb !

works fine

thanks
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