
Configuring ATM DXI Services
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The multipath feature lets you group several lines that back up one another to
ensure that information makes it across the network. Figure 2-8 shows a network
with two physical links across the ATM network.
Figure 2-8. Multipath Network
In this example, when the router receives traffic destined for the network, it
alternately chooses Path A or Path B, at random, to transmit the data. The router
uses both lines, simultaneously, to balance the load. If one of these connections
fails, the router uses the remaining path.
You can configure multipath for direct access mode PVCs only. The most
significant part of configuring multipath is how you set a PVC’s VPI/VCI pair.
This number identifies each PVC, thereby identifying a path for the router to
direct data out to the network.
See “Setting PVCs f
or Multipath Mode,” in Chapter 3 for instructions on
configuring multiple PVCs to run in multipath mode.
Note: If you use multipath mode, packets traveling on the two paths may
arrive at their destination out of sequence. Some protocols do not tolerate
packets arriving out of sequence. As a result, you may experience poor
performance or failures.
Path A
Path B
Router
Router
ATM
Network
ATM0014A
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