Answer by Daniele Santi for What is the difference between there has `(config-if)` and not in Cisco IOS?

(config-if) simply means you're in "Interface Configuration" mode, i.e. you did something like

Central(config)#interface Gi0/1Central(config-if)#interface Gi0/1

while in "Global Configuration Mode" (i.e. the simple (config)).