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I have a Mac Snow Leopard Server with 2 NIC's. Each NIC is plugged into a separate physical switch. Currently each NIC has it's own IP, but I would like to setup redundancy so that they communicate with one combined IP. I am unsure how to do this on a Mac Server. Any help?

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You should be able to set up an LACP aggregate between the two if they are on the SAME switch. Pages 166-167 of:

10.6 Advanced Server Admin Guide

I know of no Teaming software available to allow failover across switches. It's another missing enterprise feature.

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I think you may also have to set the team on the switch side for OS X to be able to use it. – churnd Sep 15 '11 at 19:33
They are not on the same switch because it is not possible in our infrastructure (without losing redundancy), but I have heard you can write a script to accomplish the task. – Cathi Sep 15 '11 at 19:47
Setting up and LACP (802.3ad aggregate) requires a port channel on the switch yes. – Tatas Sep 15 '11 at 20:02
You can certainly control bonding from the command like man networksetup. But if what Tatas, says is true, and the bonding cannot work across a switch, then you may be SOL. A simple script cannot make the kernel do anything that it is not designed to do. – Zoredache Sep 15 '11 at 20:12
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Unless you're using some sort of virtualized technology with your switches, you can't do this. You can't port channel across switches, they don't share mac address tables. – Tatas Sep 15 '11 at 20:16
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