Redistribution proces between IGP routing protocols especially with externally redistributed networks may cause problems like routing loops or suboptimal routing. In thic article we will look closer on particular scenarios of redistribution between them.
In both routing protocols OSPF and EIGRP route summarization and default route propagation are crucial, especially if you have complex network with a lot of prefixes. Properly implemented summarization can save a lot of router resources. Let’s check how to implement both features and what is “mystery” null0 interface involved in summarization.
Enhanced Interior Gateway Routing Protocol (EIGRP) is considered deprecated routing protocol. In my opinion unfairly. Despite EIGRP is distance vector protocol (or rather hybrid protocol) is still being utilized in small and medium networks. Reliability and efficiency in connection with simplicity of deployment make EIGRP still worth of considering routing protocol, especially, that has DUAL algorithm .