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NLB node dropping out of cluster | server 2012 | vmware

Posted on 2014-12-09
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Hi,

i have an environment that is

3 x server 2012 servers
each server is a DC
each server has a web application running on it
each server has 2 vnics

For whatever reason, unknown as yet, one of the servers keeps dropping out of the NLB cluster and has to be restarted.

The NLB cluster is currently configured in unicast mode.

in this environment, a vswitch has been configured for the nlb vnics.  I cannot find any vmware guidance that this should be done.  The issue was happening before this configuration was implemented.
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Question by:cmatchett
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 40490158
Hey, my favourite topic and question, and it's a difficult issue, but simple to fix!

1. It's recommended to use NLB in Multicast mode with VMware vSphere. (all versions, always!).

2. When using Multicast mode, you *MUST* use Static ARP (MAC and IP) addresses in your physical switches connected to ALL physical ports or ALL ESXi servers taking part in NLB traffic.

3. This also includes, where you would expect to see multicast traffic to your NLB Cluster, e.g. uplinks between switches.

4. If you cannot use Multicast, be bothered to do all the switch work required, do not have switches you can apply Static ARPS, look to 5.

5. Purchase a hardware network load balancer or see 6.

6. Use http://www.zenloadbalancer.com/ (free VM)
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by:cmatchett
ID: 40490163
Hi Andrew,

continue to use 2 vnics but change the operation mode to multicast?
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LVL 122
ID: 40490176
Unicast to Multicast is a BIG change, can your physical switches support Static Arps ?

also see these articles

Sample Configuration - Network Load Balancing (NLB) Multicast Mode Configuration (1006558)
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