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2 ironports email security appliance redundancy

Hi,

I have two IronPort ESA C160 devices and would like to cluster them for redundancy. My question is:

When the devices are clustered, is there a cluster IP address (not an interface on either device) which is created which emails from Exchange can be routed to? Since only 1 of the 2 devices will be active at any given time, how can Exchange distingiush which Ironport device to route to?

Any assistance would be greatly appriciated.

Omar Badawi

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