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Lesson 7 Bandwidth Allocation Protocol (BAP)
Objective Enable BAP.

Bandwidth Allocation Protocol (BAP)

In Windows NT 4.0, RAS supports basic multilink capabilities--the combination of multiple physical links into one logical link. Typically, two or more Integrated Services Digital Network (ISDN) lines or modem links are bundled together for greater bandwidth.
In Windows 2000, BAP and Bandwidth Allocation Control Protocol (BACP) enhance multilink capabilities by dynamically adding or dropping links on demand. BAP is especially valuable to operations that have carrier charges based on bandwidth utilization.

Bandwidth Allocation Protocol

PPP Multilink


The terms BAP and BACP are sometimes used interchangeably to refer to bandwidth-on-demand functionality. Both protocols are PPP control protocols and work together to provide bandwidth on demand. BAP provides a very efficient mechanism for controlling connection costs while dynamically providing optimum bandwidth. You can enable PPP Multilink and BAP protocols on a server-wide basis on the PPP tab in the Properties dialog box for each remote access server.
PPP tab in the properties dialog box
You configure BAP settings through remote access policies. Using these policies, you can specify that an extra line will be dropped if link utilization drops below 75 percent for one group and below 25 percent for another group. You will learn more about remote access policies later in this course.
Note: BAP is a PPP control protocol that is used to dynamically add or remove additional links to an MPconnection. BACP is a PPP NCP (Network Control Protocol) that elects a favored peer in case both PPP peers request to add or remove a connection at the same time. For more information about the multilink protocol, go to the Resources page to view RFC 1990. For more information about BAP/BACP, go to the Resources page to view RFC 2125. The next lesson wraps up this module.

Bandwidth Allocation-Protocol - Exercise

Click the Exercise link below to match protocol terms to their definitions.
Bandwidth Allocation-Protocol - Exercise