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Route summarization in Detail with Scenarios

This Video brief about Route summarization. Route summarization is a method where we create one summary route that represent multiple networks/subnets. It’s also called route aggregation or supernetting. Summarization has a number of advantages: ¯ Saves memory: routing tables will be smaller which reduces memory requirements. ¯ Saves bandwidth: there are less routes to advertise so we save some bandwidth. ¯ Saves CPU cycles: less packets to process and smaller routing tables to work on. ¯ Stability: Prevents routing table instability due to flapping networks. There are also some disadvantages to summarization: ¯ Forwarding traffic for unused networks: a router will drop traffic when it doesn’t have a matching destination in its routing table. When we use summarization, it’s possible that the summary route covers networks that are not in use. The router that has a summary route will forward them to the router that has advertised the summary route. ¯ Sub-optimal routing: routers prefer the path with the longest prefix match. When you use summaries, it’s possible that your router prefers another path where it has learned a more specific network from. The summary route also has a single metric.