Route Summarization Basics
Imagine a small router, with limited CPU and memory, sitting in a large enterprise network. This network has over 10,000 subnets. This one small router dutifully learns all the routes with its routing protocols and adds them to its routing table. Those routes consume memory; the routing protocols take more work because of the sheer volume. Also, the long routing table means that searching the table to match a route can take longer.
Most of those 10,000 routes have the exact same forwarding instructions: to send packets out one particular interface that points toward the core of the enterprise network. Wouldn’t it be great if, instead of having several thousands of those routes, this small router could have one route ...
Get CCENT/CCNA ICND1 100-101 Official Cert Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
