Traffic Engineering Before MPLS
How was traffic engineering done before MPLS? Let's look at two different statmux technologies that people use to perform traffic engineering—IP and ATM.
IP traffic engineering is popular, but also pretty coarse. The major way to control the path that IP takes across your network is to change the cost on a particular link. There is no reasonable way to control the path that traffic takes based on where the traffic is coming from—only where it's going to. Still, IP traffic engineering is valid, and many large networks use it successfully. However, as you will soon see, there are some problems IP traffic engineering cannot solve.
ATM, in contrast, lets you place PVCs across the network from a traffic source to a ...
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