
Bandwidth-on-Demand Implementation Notes
117353-B Rev. 00
8-3
Multilink lets you combine a set of lines between two routers into a single bundle,
which can consist of up to 30 links of different speeds. The actual number of links
in the bundle depends on the hardware platform, total bundle speed, the speed of
each link in the bundle, and the type of traffic.
Each bundle belongs to a separate circuit. Multilink distributes traffic over each
logical line in a bundle in an amount proportional to the bandwidth of the link.
The router sending the data divides the outbound traffic among all the lines in the
bundle. Once data reaches the destination router, multilink reassembles and
resequences packets arriving on different lines.
Figure 8-1
shows how multilink and bandwidth-on-demand work together. In this
figure, one router is the congestion monitor. This router monitors traffic volume
over the bandwidth circuit. If the monitor router detects congestion, it activates an
additional line, in this case, an ISDN B channel. If the volume of traffic is still
heavy, the monitor router adds more channels until congestion is relieved.
Figure 8-1. Multilink and Bandwidth-on-Demand Operation
For more information about PPP multilink, see Configuring PPP Services.
Key
Secondary circuits
in a multilink bundle
Leased line
New York City
Boston
ISDN
DS0003A
Monitor
router
Nonmonitor
router
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