Re: failure detection

[Iljitsch van Beijnum <iljitsch@muada.com>]

On 28-aug-2005, at 22:44, marcelo bagnulo braun wrote:

> > It might very well be a useful optimization for routers to be able  
> > to express to hosts which prefixes are currently not working for  
> > going outside the site. But I think it would be a mistake to  
> > overload the preferred/deprecated notion for this purpose;

> I agree that using the "preferred lifetime" for signaling that a  
> prefix is no longer working would imply to change the meaning of  
> the field, but wouldn't it be possible to use the "valid  
> lifetime" (set to zero) to inform the hosts that a prefix is no  
> longer available?

The behavior when the preferred and valid lifetimes reach 0 is  
already well-defined, I don't think we can (or should want to) change  
this.

We have to be careful to stay away from premature optimization:  
either and address works, or it doesn't. The reachability detection  
will figure it out, that's good enough for now...