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TCP/IP Guide by Charles M. Kozierok

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PPP Multilink Protocol (MP, MLP, MLPPP)

Most of the time, there is only a single physical layer link between two devices. However, there are some situations for which there may actually be two layer 1 connections between the same pair of devices. This may seem strange. Why would there be more than one link between any pair of machines?

There are a number of situations in which this can occur. A common one is when two links are intentionally placed between a pair of devices. This is often done to increase performance by widening the pipe between two devices, without going to a newer, more expensive technology. For example, if two machines are connected to each other using a regular analog modem that's too slow, a relatively simple solution is to ...

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