It really depends on why it is failing. If it is failing because it does not get a response from the authentication server then it will try any other authentication servers in your list. This could take some time.
If the authentication server responds with either a success or failure there should be no real difference in the time taken.
I think a lot of us have ever experienced this: When login to a TACACS+ enabled router, if you key in the correct pwd, it will grant you access almost in no time; whereas if you have any typo... hoho, better to get a cup of coffee from vending machine.
I would like to know what is happening within the long delay.
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...