This section discusses how OSPF and Multiprotocol Label Switching (MPLS) work together in many of today’s more complex internetworks. To facilitate your understanding of how these two rather unique and somewhat different networking technologies interoperate, you most likely should understand the fundamentals of what MPLS is and why it is being deployed.

Background of MPLS

In the early 1990s, the core of the Internet was connected mostly by T1 circuits between various routers with a handful of T3 circuits. This, of course, is a far cry from what the Internet is today, but this was many years ago in Internet time.

There was some benefit to these simpler times. There were only a handful of routers and links to manage and configure. ...

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