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Upgrading Cisco ASA 5550 from active/standy to active/active?

Requirement wise I should be in the clear. Same model, same software version, version supports multi context mode.

Question is, is there a guide for upgrading a production active/standy pair, to active/active? Obviously would like to keep the same configuration, but I am not sure of the process, and downtime involved. etc
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arnold
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Why do you want to do this? If you have any VPNs (remote or L2L) you will need to remove them as VPN is not supported on Active Active?

I've never really seen a credible reason to go Active Active, unless you have two physical firewalls and want to provide failover to multiple tenants?