Cisco IOS vs NXOS AAA Authentication

[bphillips15]

Does the Cisco IOS AAA Authentication that would essentially block logins against the local database if TACACS or RADIUS is reachable also apply to Cisco NXOS? 

IOS: aaa authentication login default group tacacs+ local

NXOS: aaa authentication login default group acs local

[balaji.bandi]

Nexus same like IOS :

you need to enable feature before configure as below :

feature tacacs+

AAA config : ( change the parameter as per your requiremetn)

tacacs-server host  IPOFTACACS  key 7 YOURKEY

aaa group server tacacs+ BBANDI
aaa authentication login default group BBANDI
aaa authorization commands default group BBANDI local
aaa accounting default group BBANDI

There is good flow diagram to understand for referenece :

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/security/configuration/guide/b_Cisco_Nexus_9000_Series_NX-OS_Security_Configuration_Guide_7x/b_Cisco_Nexus_9000_Series_NX-OS_Security_Configuration_Guide_7x_chapter_011.pdf