Sets the maximum number of outstanding TAL authorization requests SSG will allow at once; beyond this, SSG logs a syslog message and starts dropping packets that would have triggered new RADIUS requests at the CEF fast path. This is the hard backpressure valve for TAL — once AAA can't keep up and the in-flight count, visible via cssgTalWaitingForAuthUsers, hits this ceiling, new subscriber traffic gets summarily dropped rather than queued indefinitely, protecting SSG itself at the cost of blocking newly-arriving subscribers. If AAA slows down and cssgTalWaitingForAuthUsers approaches a configured cssgTalMaxPendingAuthReqs of 2000, new subscribers trying to come online during that window will start being silently dropped at the fast path along with an accompanying syslog message.