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TCP/IP Guide by Charles M. Kozierok

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PPP Multilink Protocol (MP) Frame Format

Some devices are connected not by a single physical layer link but by two or more. These may be either multiple physical connections, such as two connected pairs of modems, or multiplexed virtual layer 1 connections like ISDN B channels. In either case, PPP MP can be used to aggregate the bandwidth of these physical links to create a single, high-speed bundle. I describe how this is done in Chapter 11.

After MP is configured and starts working, it operates by employing a strategy for dividing up regular PPP frames among the many individual physical links that compose the MP bundle. This is usually accomplished by chopping up the PPP frames into pieces called fragments and spreading them across the physical ...

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