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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 first 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 configured maximum number of links on the
MP interface will never be exceeded.
BOD uses configured 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 first 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 configuring an MP bundle, keep the following in mind:
v Mixing dial circuits with “leased” lines causes the software to disable BAP on the
bundle and use BOD instead. Only mix dial circuits with “leased” 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
“leased” lines or Layer 2 Tunneling circuits.
v You cannot use DIALs on bundles that contain PPP “leased” lines.
v All devices joining an MP bundle must have link speed configured.
Important:
1. Do not configure 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.
Using MP
510
MRS V3.2 Software User’s Guide
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