Tag archive: routing prorocol

Everything is going seamlessly regarding redistribution if we have only one point of redistribution, but when we add another router on the edge of 2 routing protocols, for instance in order to provide “high availability” by adding another point of failure to get redundancy,  then our network is exposed to very inefficient sub-optimal routing.

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.