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PPP Multilink Protocol (MP/MLP/MLPPP)
(Page 2 of 3)
PPP Multilink Protocol Architecture
MP is an optional feature of PPP,
so it must be designed to integrate seamlessly into regular PPP operation.
To accomplish this, MP is implemented as a new architectural “sublayer”
within PPP. In essence, an MP sublayer is inserted between the “regular”
PPP mechanism and any network layer protocols using PPP, as shown in
Figure 31.
This allows MP to take all network layer data to be sent over the PPP
link and spread it over multiple physical connections, without causing
either the normal PPP mechanisms or the network layer protocol interfaces
to PPP to “break”.
Figure 31: Multilink PPP Architecture The column on the left shows the TCP/IP model architecture with corresponding OSI Reference Model layer numbers. The center column shows the normal PPP layer architecture. When Multilink PPP is used, there are separate PPP implementations running over each of two or more physical links. Multilink PPP sits, architecturally, between these links and any network layer protocols to be transported over those links. (In this diagram only IP is shown, since it is most common, but Multilink PPP can in fact work with multiple network layer protocols, each being sent over each physical link.)
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 Key Concept: The PPP Multilink Protocol (MP) allows PPP to bundle multiple physical links and use them like a single, high-capacity link. It must be enabled during link configuration. Once operational, it works by fragmenting whole PPP frames and sending the fragments over different physical links.
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