Manual Route Summarization Concepts
Small networks might have only a few dozen routes in their routers’ routing tables, but the larger the internetwork, the larger the number of routes. Some enterprises might have tens of thousands of subnets, if not more. Even with the effect of decreasing the number of routes through summarization, Internet router BGP tables have come close to the 450,000 mark as of a recent check in 2012.
As a router’s routing table grows, problems can occur. The tables themselves consume memory in a router. Routing (packet forwarding) requires the router to match a route in the routing table, and searching a longer table generally takes more time and more work by the CPU. Routing protocols require more work to process the ...
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