
Frame Relay Overview
308624-14.10 Rev 01
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Multiline for PVCs
Frame relay provides a link redundancy feature called multiline, which works
with frame relay PVCs. Multiline is a Nortel Networks proprietary
implementation that lets you group two or more physical lines that back each
other up in case of a failure. This ensures that information arrives at its destination
on the network. In addition, if both lines are up, the router uses both lines
simultaneously. Two or more physical lines must be available for a multiline
configuration. Figure 1-12
illustrates a multiline configuration.
Figure 1-12. Multiline Network
In this example, when the router receives traffic destined for the network, it
alternates or randomizes (depending on how you configure it) between line A and
line B to transmit the data. The router uses both lines simultaneously to balance
the traffic between each path. If one of these lines goes down, the router uses the
remaining line.
You can create a multiline configuration of up to four service records. Each
service record must be on a different physical line on the router. Each line should
be on a different slot to provide fault tolerance.
You must also match DLCIs in each service record of the multiline. Matching
DLCIs ensures that a backup exists for each PVC.
Line A
Line B
Router
DLCI 100
DLCI 100
Router
DLCI 200
DLCI 200
Frame
relay
network
FR0009A
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