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Configuring Frame Relay Services
2-30 117376-B Rev. 00
The most important part of configuring multiline is setting the PVC DLCI
number. This number identifies each PVC, thereby specifying a path for the router
to direct data to the network. For each frame relay PVC that you configure, check
that PVCs with the same destination have the same DLCI number.
For instructions about grouping service records for multiline, see Cha
pter 3,
“Customizing Frame Relay.”
Traffic Distribution Between Data Paths
To distribute traffic between multiline data paths, you can use one of two methods:
Random distribution
Address-based distribution
Random Distribution
Random distribution means that as the router sends out each packet, it alternates
between the lines. This option determines which line the packet uses based on a
randomly assigned number. For each outbound packet, the router generates a
random number, and this number designates the line to use.
Random balancing evenly distributes traffic and lets the router use the two lines
efficiently. Because packets travel on different paths, they arrive at the destination
out of sequence, and the upper-layer protocols, for example, IP and Open Systems
Interconnection (OSI), have to resequence the information. Some protocols
cannot tolerate packets arriving out of sequence, so be sure this option is
appropriate for your application.
Address-Based Distribution
Address-based distribution, as the name implies, determines the data path for
outbound traffic from the source and destination address in each packet. Any
given address pair always uses the same path.
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.
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