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MSPP vs MPLS

Hi

Why MPLS is a evolution of MSPP ? What's the basic difference ? The common factors are, as my understanding,

1. based on Sonet/SDH transport.

2. deliver both voice(TDM) and packet(IP, ATM, ethernet/ppp)

I think MPLS is a evolution of IP. It provide high speed packet switching, Traffic engineering, and network protection/recovery function above IP network.

More confusing, I read a blog saying MPLS is a Sonet Alternative. Isn't Sonet is physical layer of MPLS ?

 

Thanks

Michael

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