I am facing strange issue. Initially we were facing issue to login one of APIC (APIC-3) with TACACS authentication and rest of APIC in cluster was working fine for authentication.We did upgrade and after that same issue started for APIC-1.
Currently I am able to login to APIC-2 using TACACS authentication but getting error "AAA servers are unreachable" for other APICs.
Our Security team remove and added APIC config in TACACS but still issue is not resolved.
Please suggest what should we check on APIC side and how?
All TACACS configuration is standard and on other site same config is working.
