Avaya Configuring Dial Services Manual de usuario Pagina 75

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Implementation Notes
3-25
These features are particularly beneficial for bandwidth-on-demand
configurations, where the router activates additional switched lines to relieve
congestion over a primary line. You should always select PPP multilink when you
configure bandwidth-on-demand circuits.
When you enable multilink, you can group a set of lines between two routers into
a single bundle, which can consist of up to four links of different speeds. Each
bundle belongs to a separate circuit. Multilink distributes traffic over each logical
line in a bundle in an amount roughly proportional to the effective bandwidth of
the link.
The router sending information divides the outbound traffic among all the lines in
the bundle, keeping each packet intact. Once data reaches the destination router,
multilink resequences packets arriving on different lines.
Figure 3-8 shows how multilink and bandwidth-on-demand work together. In this
figure, you configure one router as the congestion monitor. This router monitors
traffic volume over the primary line. If the monitor router detects congestion, it
brings up an additional line, in this case, an ISDN B channel. If the traffic is still
heavy, the monitor router brings up additional channels until congestion is
relieved.
Figure 3-8. Multilink and Bandwidth-on-Demand Operation
For more information about PPP multilink, see Configuring PPP Services.
ISDN
Key:
Bandwidth on
Demand Circuits
Multilink
New York City
Boston
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