The MPLS WG Archive

["Erickson Trejo-Reyes" <eenet@electeng.leeds.ac.uk>]

Hello, I wouldn't like to take too much of your time, but if you can be kind enough to answer some questions that I have, I would greatly appreciate it. I have some doubts about MPLS.

 

While reading about MPLS specification (all my previous experience is on ATM networks), I have always found statements like: - a path is selected and resources are reserved in every node it traverses... Does that imply some sort of call admission control? (Many have told me that CAC is not considered for MPLS, at least for a telephony service on top of it). My question lies in the fact that, in order to reserve resources, first, some kind of effective bandwidth must be computed (am I wrong?). Next, if resources are reserved, that means that in some cases the requested resources couldn't be granted (because they would be already reserved). Finally, if a CAC mechanism is not due to be applied (for those who say so), how will a network warrant some bounds on performance metrics like delay and packet losses.

 

Well, thank you very much in advance, I always consider your comments and discussions of great value.

 

 

Erickson Trejo-Reyes

eenet@electeng.leeds.ac.uk