Version 32.6.1 adds support for configuring primary and secondary TACACS+ IPv6 servers as authentication, authorization, and accounting servers.
All platforms.
The following commands add the host_ipv6address and client_ipv6address options:
configure tacacs [primary | secondary] server [host_ipaddr | host_ipV6addr | hostname] {tcp_port} client-ip [client_ipaddress | client_ipv6address] {vr vr_name}
configure tacacs-accounting [primary | secondary] server [host_ipaddr | host_ipV6addr | hostname] {tcp_port} client-ip [client_ipaddress | client_ipv6address] {vr vr_name}