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MPLS and VPN Architectures, CCIP™ Edition by Jim CCIE #2069 Guichard, Ivan CCIE #1354 Pepelnjak

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Chapter 3. Cell-mode MPLS Operation

This chapter includes the following topics:

In Chapter 2, “Frame-mode MPLS Operation,” you saw how MPLS is run between Layer 3 switching devices (routers) across Frame-mode interfaces. The routers running MPLS exchange pure IP packets (for control protocols) as well as labeled IP packets (forwarded or non-adjacent locally sourced traffic) over the same link. They also perform label switching by examining the label header in front of the IP packet.

When trying to fit the MPLS architecture into the limitations of ATM technology, a number of obstacles must ...

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