BAP adds features to PPP and Multilink to monitor the connection requirements and to adjust accordingly. Enter Bandwidth Allocation Protocol (BAP). Multilink itself does not include provisions to monitor the connection requirements. Since ISDN has traditionally been billed per usage, and analog long distance phone calls are also typically billed per usage, maintaining the virtual link when the bandwidth requirements are low could prove costly. This approach is not without drawbacks, however. The combined links provide a virtual connection, in the case of ISDN, of 128 kbps. Often, it is more beneficial to combine the two finks. This 2B+D connection can provide two separate physical links.
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ISDN provides two bearer channels (2B) plus one control channel (D).
Sometimes, there is an advantage to providing a single virtual link that encompasses multiple physical links, like the B-channels on an ISDN connection. PPP is generally used for different types of dial-up connections.
One of the many features of PPP is Multilink. Most VPN and remote access technology today is built upon PPP or extensions of this protocol. The Point-to-Point Protocol (PPP) provides encapsulation, authentication, and encryption functions for remote access connectivity. Laura Hunter, in MCSA/MCSE (Exam 70-291) Study Guide, 2003 PPP Multilink and Bandwidth Allocation Protocol (BAP)
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