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Win 2k8R2 Multicast NLB not resolving to the online node when one node is off ?

Posted on 2011-09-23
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Last Modified: 2012-05-12
Hi All,

I have created Multicast NLB on my 2x stand alone Windows Server 2008 Enterprise R2 SP1 VMs according to the following guides (on top of ESXi 4.1u1)

From Windows Guest OS level: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1006558
and
From Networking level: http://kb.vmware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&docTypeID=DT_KB_1_1&externalId=1006525

AppClu01 --> Clustername A Record
ServerProd1 --> Node 1
ServerProd2 --> Node 2

However, when one of the node is turned off, the web application that is accessed using http://AppClu01 is inaccessible ?

Any idea to troubleshoot this issue would be greatly appreciated.

Thanks.
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by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 36588081
Have you statically allocated the ARP MAC address of the Cluster in your switches?

This is a requirement, and it's what we've done in the past, to get this working, and make sure the NLB Cluster is Converged.
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by:Senior IT System Engineer
ID: 36588108
Have you statically allocated the ARP MAC address of the Cluster in your switches?
Yes I have added in the switch (according to th network team) I suspect that the switch is load balanced as well so there is only one out of two that has been updated with the static MAC entry ?
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LVL 124

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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 36588139
Check with the Network Team, they have complete this, many a client and EE issue, we see, is because Static ARPs have not been done correctly, on every Port, Trunk, Uplink etc
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LVL 8

Author Comment

by:Senior IT System Engineer
ID: 36596695
my only workaround is to shutdown both nodes and then start them all up together at once, but this is defeats the purpose of having NLB multicast server ?
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LVL 8

Author Comment

by:Senior IT System Engineer
ID: 36596698
after the shutdown on both servers, the cluster name is available to serve the request again normally.
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LVL 124
ID: 36598429
Again, check static ARPs have been added to all switches.
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