If the administrator is unable to obtain accounting information from the TACACS+ server, perform the following steps.
show tacacs
Check whether accounting is enabled on the switch:
Switch:1>enable
Switch:1(config)#show tacacs
Global Status:
   global enable : false
   authentication enabled for : cli
   accounting enabled for : none
   authorization : disabled
   User privilege levels set for command authorization : None
Server:
                      create :
Prio   Status  Key     Port  IP address  Timeout Single Source SourceEnabled
Primary NotConn ******   3    192.0.2.254      30   true 5.5.5.5  true
Backup  NotConn ******  47    198.51.100.1      10  false 0.0.0.0 false