This is the table index (1-8) identifying a specific TACACS+ server row within the per-server authorization statistics table, the phase that governs whether an already-logged-in user is allowed to run a particular command. An admin narrowing down why command authorization is slow or failing on a switch with multiple TACACS+ servers uses this index to isolate one server's authorization counters instead of relying on the blended Global authorization totals. For example, this distinguishes rows for two different authorization servers so an admin can tell whether command-level restrictions are applied consistently between them.