Avaya Configuring Frame Relay Services Manual de usuario descargar pdf (Pagina 34)

Configuring Frame Relay Services

2-10

Multiline

Frame Relay provides a redundancy multiline feature. The multiline feature 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 2-6

illustrates a multiline conﬁguration.

Figure 2-6. Multiline Network

In this example, when the router receives trafﬁc destined for the network, it

alternates randomly 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 conﬁgure multiline for group access mode and direct access mode PVCs.

The most important part of conﬁguring multiline is how you set a PVC’s DLCI

number. This number identiﬁes each PVC, thereby identifying a path for the

router to direct data to the network. For each Frame Relay PVC that you

conﬁgure, be certain that PVCs with the same destination have the same DLCI

number.

Refer to Chapter 4 for instructions about grouping PVCs for multiline.

Note: If you use multiline, packets traveling on the two paths may arrive at

their destination out of sequence. Some protocols do not tolerate packets

arriving out of sequence, and as a result, you may experience poor

performance or failures.

Line A

Line B

Router

DLCI 100

Router

DLCI 200

Frame

Relay

Network

FR0009A

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Avaya Configuring Frame Relay Services Manual de usuario Pagina 34