Re: ASA active/standby mode in active/active status
The main differences between the two units in a failover pair are related to which unit is active and which unit is standby, namely which IP addresses to use and which unit is primary and actively passes traffic.
A few differences exist between the units based on which unit is primary (as specified in the configuration) and which unit is secondary:
The primary unit always becomes the active unit if both units start up at the same time (and are of equal operational health).
The primary unit MAC address is always coupled with the active IP addresses. The exception to this rule occurs when the secondary unit is active and cannot obtain the primary MAC address over the failover link. In this case, the secondary MAC address is used.
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...