48{ Tries to communicate with a secondary server in active state that has the highest priority.• If the secondary server is unreachable, the device performs the following operations:{ Changes the server status to blocked.{ Starts a quiet timer for the server.{ Tries to communicate with the next secondary server in active state that has the highestpriority.• The search process continues until the device finds an available secondary server or haschecked all secondary servers in active state. If no server is available, the device considers theauthentication, authorization, or accounting attempt a failure.• When the quiet timer of a server expires, the status of the server changes back to active. Thedevice does not check the server again during the authentication, authorization, or accountingprocess.• When you remove a server in use, communication with the server times out. The device looksfor a server in active state by first checking the primary server, and then checking secondaryservers in the order they are configured.• When all servers are in blocked state, the device only tries to communicate with the primaryserver.• When one or more servers are in active state, the device tries to communicate with theseservers only, even if they are unavailable.• When an HWTACACS server's status changes automatically, the device changes this server'sstatus accordingly in all HWTACACS schemes in which this server is specified.Restrictions and guidelinesA short real-time accounting interval helps improve accounting precision but requires many systemresources. When there are 1000 or more users, set a real-time accounting interval longer than 15minutes.ProcedureTo set HWTACACS timers:Step Command Remarks1. Enter system view. system-view N/A2. Enter HWTACACS schemeview.hwtacacs schemehwtacacs-scheme-name N/A3. Set the HWTACACS serverresponse timeout timer.timer response-timeoutsecondsBy default, the HWTACACSserver response timeout timer is 5seconds.4. Set the real-time accountinginterval.timer realtime-accountingminutesBy default, the real-timeaccounting interval is 12 minutes.A short interval helps improveaccounting precision but requiresmany system resources. Whenthere are 1000 or more users, seta longer interval.5. Set the server quiet timer. timer quiet minutes By default, the server quiet timeris 5 minutes.Display and maintenance commands for HWTACACSExecute display commands in any view and reset commands in user view.
