High Availability for ARR-Week 38

You can find this week’s video here.

Note: This week’s video got stuck in the publishing process so sorry for the delay, but here it is.  Next week I’ll move on to some other topics besides web farms, to mix it up.

Application Request Routing (ARR) does not have high availability built in, so it's up to us to implement a solution to ensure that ARR doesn't become a single point of failure. Options include hardware load balancers, other software load balancers, or two Microsoft options-namely NLB and Clustering Services.

Today's video discusses these options and then takes us on a walkthrough of setting up Microsoft's Network Load Balancing(NLB) solution. There are certain considerations to ensure that NLB works with your network and that it properly health tests to ensure that a failed node is automatically taken out of rotation.

For your reference, the following four links were mentioned in the video:

This is now the 13th week in a mini-series on web farms, and the 38th week of the entire series. You can view past and future weeks here:http://dotnetslackers.com/projects/LearnIIS7/

You can find this week’s video here.


  • Scott,
    The video is about the log parser tool instead of high availability ARR

  • Thanks for mentioning Emil. This has been fixed.

  • Great videos! However on this particular one something some don't think about is the term single point of failure. So my question deals with NLB, ARR, and redundant /stacked switches and NIC teaming. I was having issues with NIC teaming and NLB and being forced to use Multicast and having to manual ARP table entries into Cisco switches. Is there a better solution?

  • Hi Michael,

    Yeah, that's common for NLB and Cisco switches. I don't believe there is any way around it for that configuration. The first link above explains how to do that, although it sounds like you've already done so. It would certainly be nice if there was a more straight forward configuration for HA for ARR. At this least does indeed work as long as you can make the changes on the switches.

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