Cisco CCNP Certification / BSCI Exam Tutorial: Route Summarization Basics
As you earn your CCNA and CCNP certification, you’re going to have to get comfortable with manually summarizing routes. This isn’t just another reason to learn binary math (although it’s a good one!), but summarizing routes is a true real-world skill that can help your network operate more efficiently. So the question isn’t just how to summarize routes, it’s why.
When you summarize routes in RIP, IGRP, EIGRP, or OSPF, you’re replacing a series of routes with a summary route and mask. With RIP, IGRP, and EIGRP, this actually lessens the size of the routing update packet itself – multiple routes are replaced with the summary route. For instance, the routes 8.0.0.0/8, 9.0.0.0/8, 10.0.0.0/8, and 11.0.0.0/8 can be summarized as 8.0.0.0 252.0.0.0. Only the summary address will be found in the update packet, making it concise yet complete.
Summarizing routes can also make the routing table smaller, yet still allow for complete IP connectivity when done correctly. Using the above example, the four more-specific routes will be replaced by a...
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