In PIX failover, one PIX will be active and the other is standby, like HSRP. They won't be active-active. However, the two PIX configs will need to be the same (except for the standby IP will be different). Once the failure occurs, the standby PIX will take over the IP and mac - thus becoming active.
But the two configs need to be the same, otherwise when the failover occurs your new active PIX will have a different config than the old active PIX. Configs aren't forced over on failovers (they are pushed only when you enter the command to do so), only the IP and MAC are exchanged.
Hope it helps.
Steve
