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Configuring Dial Services

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117353-B Rev. 00

Bandwidth-on-Demand Service for Congested Demand Lines

To relieve congestion across a demand line, you can use up to 29 additional lines

from an existing bandwidth-on-demand pool, providing a total of 30 lines for

communication. This feature is only for demand configurations that use PPP as

the data link-layer protocol. Adding bandwidth to a congested demand line

benefits time-critical applications that require data to reach its destination

efficiently.

To enable bandwidth-on-demand service, you associate the demand circuit with a

bandwidth-on-demand pool, then you configure parameters that monitor

congestion across the line.

Once you enable bandwidth-on-demand service, the router determines that the

demand line is congested when the traffic over the line exceeds a certain

user-configured threshold. The router that is configured as the congestion monitor

then searches for an available line from the bandwidth pool that you associate with

this demand circuit.

Lines in a bandwidth-on-demand pool can reside across slots, so you need to

designate each slot as either preferred or reserved. This determines the order in

which the router searches the slots for available lines; the preferred slot is first and

the reserved slot is second. If these slots have no available lines, the router

automatically uses the local slot. The local slot is the slot containing the first

demand line that was activated. When the router activates additional lines, they

adopt the configuration of the congested demand circuit.

PPP multilink is the protocol that enables the router to use multiple lines

simultaneously to transmit data. Multilink enables the router to use lines at

different speeds and to evenly distribute data across those lines. When you enable

multilink, you can configure a set of links between two peers into a single bundle.

The actual number of lines in a multilink bundle depends on hardware platform

constraints, total bundle speed, the speed of each link in the bundle, and the type

of traffic you are sending.

For PPP demand connections across ISDN lines, you can manage the allocation of

bandwidth for a multilink bundle by enabling the PPP Bandwidth Allocation

Protocol (BAP). This protocol is available only after bandwidth service is set up.

For more information about BAP, refer to Chapter 8.

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Avaya Configuring Dial Services Bedienungsanleitung Seite 40