Whenever the authentication process starts, device first tries to send the authentication request to tacacs+ server. Since the tacacs+ server is not avilable, the device tries it 3 times i.e. 5 seconds for each try. That is the reason thier is a delay in the prompt. ONce the 3rd try is done, the device fallback to other method.
The deadtime period begins as soon as the last server in the AAA
server group has been marked as down (unresponsive). A server is
marked as down when the max-attempts value is reached and AAA fails to
receive a response. When the deadtime period expires, the AAA server
group is active and all requests are submitted again to the AAA servers
in the AAA server group.
This means each server in the list should be tried before the group
is marked dead.
The failover is depending on 2 values ie : " Server timeout " and " Failback
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...