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HA with ASA 55xx requirements

Hi all, I am currently testing some ASA's in a lab but need to test HA w/ Active-standby & Active-active configs. Do I absolutely need 2 of the SAME model ASA's or can I still test HA w/ let's say 1 5510 & 1 5520?

Thanks,

-ZO

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Re: HA with ASA 55xx requirements

the two units in a failover configuration must have the same hardware configuration. They must be the same model, have the same number and types of interfaces, and the same amount of RAM.

http://www.cisco.com/en/US/docs/security/asa/asa72/configuration/guide/failover.html#wp1104971

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