Oh ho! someone who knows me (even though they're too cowardly to post in their own name).
But when it comes to configuring anything on proprietary UNIXs, there is/was no commonality. Sun users used to think that their way was the only way, ignoring the fact that all the other vendors, such as HP, Digital, Data General and IBM (and Sequent, Pyramid, Altos, Siemens, Nixdorf, NCR, Silicon Graphics, Intergraph...) all did it differently! People tend to forget this.
Unfortunately, the split between the major proprietary UNIX variants occurred before the general adoption of TCP/IP (and yes, I know about the relationship between TCP/IP, DARPA and BSD), but all vendors had their own source trees, and implemented support particularly for networking in different ways. As such, there were no real 'standard' ways of doing things. Especially when some TCP/IP support was 'bolted on' to another vendor's UNIX system.
The main difference with AIX was the fact that the ODM was decoupled from the so-called standard commands, so running ifconfig, route et. al. would (within the bounds of different implementations) configure the interfaces, but it would not persist across a reboot.
I think that if you wanted commonality, you would have to have settled on sysadm from the AT&T base code to really have something 'standard'. And I don't think that would have suited anybody.