How do you configure a  Mac to have two Software Update Servers?

If you have cascading Software Update servers configured and lets say one of the servers went down, is there a way to have the Mac clients automatically use the other server that is still up? I notice that you can edit the SoftwareUpdate plist on the Macs to add a "CatalogURL", would adding two URLs for different Software Update Servers do what I am asking or is there another way to do this?

John Lockwood wrote:
This does mean you need to buy a DNS load balancer to do this. The Mac itself cannot.
FWIW, OS X Server is capable of performing round-robin access with the inbound traffic using multiple IP addresses for a single host name.  The addresses are each of the software update servers in your server pool.
This'll toss errors for some translations when one of the servers is down — you can tweak the definition if one of the servers is going to be offline for a while — but some of the updates will get through.
Set the DNS TTL fairly short — probably somewhere between a few minutes and an hour — to allow the DNS translations to be changed fairly quickly, if your software update servers are prone to outages.

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