Information
A server group is a collection of servers associated with a single group name. Subsequent authorization and authentication commands can access all servers in a group by invoking the group name. The switch supports TACACS+ and RADIUS server groups.
Server groups allow AAA commands to access multiple servers, providing redundancy and load sharing. Before they are added to a group, servers must have been previously configured with a radius-server host or tacacs-server host command.
Solution
Configure a server group if required
aaa group server tacacs+ TACPLUS
server {ip address}
server {ip address}