config-router-af-interface - EIGRP named configuration use cases


Dear colleagues , do you know in which situation we could be confronted by the application of the so called " EIGRP named configuration " mode within the particular address-family ( other than if the lab task clearly states to do it that way :-) . 
Example:Router(config) #router eigrp FRANCERouter(config-router)# address-family ipv4 vrf VPN_A autonomous-system 45000
Router(config-router-af)# af-interface ethernet0/0
Router(config-router-af-interface)# authentication key-chain SITE1


docCD reference url:

thanks in advance for all your comments . wishing you an excellent day/night.
cheers ,  


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