
Frame Relay Overview
117376-B Rev. 00 2-29
Managing Routing Information Protocol (RIP) Over SVCs
RIP is a mechanism that IP and IPX use to inform network entities of routing
topology changes. The IP and IPX protocols allow you various controls over the
frequency and destination of RIP packets. Because RIP packets can affect how the
router establishes and disconnects frame relay SVCs, the software has controls
that apply to how RIP interacts with the frame relay SVC Inactivity Timer and
Inactivity Timer Mode parameters. See A
ppendix B for detailed information.
Multiline for PVCs
Frame relay provides a link redundancy feature called multiline, which works
with frame relay PVCs. Multiline is a Bay 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. F
igure 2-11
illustrates a multiline configuration.
Figure 2-11. 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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