How not allow setting ip changes interface down status?

[Joe Holden]

Jason Hellenthal wrote:
> Off the top of my head I don't know of another OS that does this.
> 
> But yes agreed changing that behavior would probably effect a lot of people in a negative way at this point.
> 
> Not to mention script breakage.
> 
> But a tunable in the stack somewhere would be awesome to change this behavior. Either interface specific or global or both.
> 
> Sometimes installing a new faucet you don't want the water to run until all the nuts, bolts and washers are installed.
> 
The entire notion is ridiculous, it is quite simple - if the interface 
is down, it isn't in the FIB, you can't arbitarily return an error for 
setting an IP on an interface that isn't up.

The last thing we need is yet more nonsense stack changes, allowing 0/8 
to be used was bad enough.