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PPP Multilink Protocol (MP) Frame Format (Page 1 of 4) 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 one connections like ISDN B channels. In either case, the PPP Multilink Protocol (MP, which also goes by several aliases such as MLPPP and MLP) 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 the operational topic on MP.
After MP is configured and starts working, it operates by employing a strategy for dividing up regular PPP frames amongst the many individual physical links that comprise the MP bundle. This is usually accomplished by chopping up the PPP frames into pieces called fragments and spreading these fragments across the physical links. This allows the traffic on the physical links to be easily balanced.
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