The MPLS-OPS Archive

[Luis Miguel <lmiguel@it.uc3m.es>]

the MPLS idea is the logical continuation of the MPOA works...if IP its
the L3 master, it's valuable to work on an IP over ATM approach...and
why not over an IP over whatever L2?. MPLS wants to be the natural
complement to IP, because MPLS can do better certainly things that IP
can?t do (i'm refering to the fish problem, as an example, or more
sofisticated TE problems). In advance, MLPS uses IP routing in order to
construct the LS tables, and ATM has it own mechanisms to construct such
a table (tipically, a manual configuration). Enhance ATM to work
together IP routing its a good idea, but make IP work with all L2
Technologies (solving the clasical problems of IP routing, all in one)
its a better idea. ATM its a very good technology, but with a lot of
complications over it (signaling its the worst of all), and MPLS will be
use to make IP over ATM work better AND many other things (TE its the
most popular)...at least its what i think...

--Luis Miguel

JACK RODRIGUEZ wrote:

 > I have been doing a lot of reading on MPLS and how it would fit into a
 > network and I have yet to figure out concrete advantages over ATM. It
 > seems that it is trying to do everything ATM already does. Okay, so
 > MPLS can do VPNs but so does ATM (LANE). Traffic Engineering =
 > SPVCs/Virtual circuits. It seems that ATM could use some enhancements
 > to make it better but why use MPLS? Why not enhance ATM switches to
 > listen to ISIS-TE/OSPF-TE information and map new virtual circuits as
 > needed? In other words, why not enhance ATM? The only disadvantage in
 > ATM is the SAR process (fastest sar processor is OC-192). I don't want
 > to start a debate, but I am looking for justification for why a
 > carrier should go to MPLS? Instead of looking at multiservice
 > routers/switches and look for enhancements to ATM (work with our
 > vendors to make ATM switches smarter). M! aybe I'm missing
 > something....Thanks
 >
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