IBM SC30-3681-08 manual MP Considerations, Using MP

Using MP
	MP interfaces that do not have a dedicated link must be inbound-only interfaces.
	These interfaces are similar to the any inbound dial circuit.
	The Bandwidth Allocation Protocol (BAP) and its control protocol (BACP) allow an
	MP interface to increase and decrease its bandwidth by adding and dropping dial
	circuits. When the bandwidth utilization algorithm determines that a link should be
	added to the bundle, if there is an available PPP dial-circuit, and the peer agrees,
	an additional call is placed.
	BAP ®rst searches for any idle dedicated PPP dial circuits for the MP interface, and
	then for any MP-enabled PPP dial circuit. It will not, however, use a dedicated PPP
	dial circuit of another MP circuit. The con®gured maximum number of links on the
	MP interface will never be exceeded.
	BOD uses con®gured dial-circuit phone numbers to place calls when needed to add
	dedicated MP dial links to an existing bundle. Links are added to the bundle one at
	a time, if needed, during a polling period. BOD adds any PPP serial links to the
	bundle ®rst and will retain the serial links throughout the life of the bundle. BOD
	only drops dial links.
	MP supports the following features:
	v	BRS
	v	WRR
	v	WRS
	v Dial-on-Demand
	v	DIALs
	However, WRS, Dial-on-Demand, and DIALs are only supported on MP bundles
	that contain only dial circuits.
MP Considerations
	When con®guring an MP bundle, keep the following in mind:
	v Mixing dial circuits with ªleasedº lines causes the software to disable BAP on the
		bundle and use BOD instead. Only mix dial circuits with ªleasedº circuits when
		you desire to use BOD to manage the bundle.
	v You cannot use Dial-on-Demand or WRS for MP bundles that contain either PPP
		ªleasedº lines or Layer 2 Tunneling circuits.
	v You cannot use DIALs on bundles that contain PPP ªleasedº lines.
	v All devices joining an MP bundle must have link speed con®gured.
		Important:
		1. Do not con®gure a bundle with media with extremely dissimilar properties.
		The largest link should have no more than 4 times the capacity of the
		smallest link. If the speeds of the links in an MP bundle differ greatly, you
		may need to add receive buffers to the faster link.
		2. When bundling ISDN B-channels with slower media types, you may need to
		increase the number of ISDN buffers. Bundling ISDN B-channels with slower
		links is not recommended for ISDN primary.
	v Adding a V.34 dial circuit to a bundle disables BAP and causes the software to
		use BOD instead.

510MRS V3.2 Software User's Guide