2.3. Load Sharing
Note that in Figure 2-4, R2 router is completely idle during its backup periods. Its whole purpose in the network consists of being a backup for R1. R2 is a purely redundant device. In certain circumstances this may not be the best arrangement. Leaving a network device idle, in particular in the case of a robust master, may be considered underutilization or waste of a valuable resource. In such circumstances the network deployer may decide to assign R2 as a default router to some hosts on the LAN—say, H3 and H4. With this configuration traffic from H1, H2 is forwarded to R1 and traffic from H3 and H4 to R2.
The obvious advantage of this configuration is the establishment of a load-sharing scheme. With this configuration, the ...
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