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It should fail over automatically but I would test to make sure your conf is correct.

how does the application/ddc know to contact australia zone app servers when india zone app servers fail? thats what I want to know.

Your VDA should have all the 4 DDC set in registry. That's how it is set for me.

I've verified that already. India zone has india ddc servers only. australia zone has australia ddc servers only.

So it won't work this way.