I agree that the IOS does not place a specific limit on the number of users that can be configured. The limit that you would run into is the size of the config file and the amount of NVRAM on the router. At some point as you add more users you would get to a point where the config would no longer fit into NVRAM.
I believe that there is also a practical limit of reasonableness. How many individual userIDs and passwords does it make sense to maintain on each router/switch?
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...