
Configuring WAN Line Services
9-12
117345-B Rev. 00
To distribute traffic among multiline data paths, you can use one of the following
methods:
• Address-Based Selection
• Random Selection
Address-Based Selection
If you choose address-based selection, the router determines the appropriate data
path for outbound traffic from the source and destination addresses in individual
packets. The router always uses the same data path for a given address pair.
The router determines whether to route or bridge the packet, and then uses the
appropriate address. It uses the routing-level addresses for routing traffic, and the
MAC-level addresses for bridging traffic.
Address-based selection ensures that all outbound traffic to a particular endstation
travels on the same data path, and that packets arrive in the correct sequence. Use
this method for protocols that cannot receive packets out of sequence. Note,
however, that this option may not result in even traffic distribution across all data
paths.
Random Selection
If you choose random selection, the router determines the data path for outbound
traffic by using random number generation. With this method, the router:
1. Assigns a set of numbers to each data path
2. Generates a random number for each outbound packet
3. Sends the packet across the data path with the matching number
Note:
Address-based selection cannot be used with frame relay in group or
hybrid access mode. Traffic distribution is automatically changed to random
selection.
Note:
Random selection provides even distribution across all active data paths
in the topology; however, packets traveling on different paths can arrive at their
destination out of sequence. Some protocols cannot tolerate packets arriving
out of sequence, and as a result, you can experience poor performance or
failures. Be sure that random selection is appropriate for your application.
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