Feature Request: Preference in bird

[Juliusz Chroboczek]

> You basically shouldn't do it. BIRD does something like last-resort pointer
> comparison and we should probably even add a warning if somebody misconfigures
> in this way.

Why not use the protocol's default preference as a last-resort tie-breaker?
It's probably less code than the warning you suggest, and should do something
reasonable in most cases.

-- Juliusz