Active/active failover means that one router is the backup of the other & viceversa. One router can recover the activity of the other. you have to configure the router to use multiple context, (you must have a license allowing it) .Indeed a have of one router(standby context) will be the backup of the have of the other router (the active context) & viceversa. The aplication of active/active failover is higth availability while distributing traffic bettwen the two router.
You must have two routeur (for exemple two asa) with same hardware and same IOS,read this: On each router you create two context 1 & 2 alos two failover groups must be created
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...