The MPLS-OPS Archive

[Yakov Rekhter <yakov@juniper.net>]

Danny,

> > Of course, one may say that one could just use traditional IP
> > routing, and run the network at sufficiently low utilization, as
> > to assure that any path has sufficient amount of resources to
> > accommodate the required QoS. But that approach has its own cost
> > as well.
> 
> I've always agreed that MPLS TE is interesting when considering 
> path selection based on a set of constraints (e.g., max jitter, 
> prop delay, etc..).  So is ATM.  
> 
> And sure, if one of the constraints is available bandwidth AND 
> resource reservation is employed throughout the network (along 
> the entire path, core included) behavior would certainly be more 
> deterministic.  

And that is precisely what MPLS Constraint-based routing does.

> Of course, everything has a cost, and this 
> resource reservation is a VERY expensive one.  

Yes, everything has a cost (except for the proverbial "free lunch").
Whether in this particular case it is "VERY expensive" is (at best) 
a matter of opinion.

Yakov.

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