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Until there is one routing protocol to rule them all, there is a need to have multiple routing protocols peacefully coexist on the same network. Perhaps Company A runs OSPF, and Company B runs EIGRP, and the two companies merge. Until the newly combined IT staff agrees on a standard routing protocol to use (if they ever do), routes known to OSPF need to be advertised into the portion of the network running EIGRP, and vice versa.

Such a scenario is possible thanks to route redistribution, and that’s the focus of this blog post. Other reasons you might need to perform route redistribution include: different parts of your own company’s network are under different administrative control; you want to advertise routes to your service provider via BGP; or perhaps you want to connect with the network of a business partner. Consider the following basic topology. In the simple topology show above, we’re wanting OSPF and...


 
OSPF Route Filtering

ccie r/s ccnp r/s Nov 14, 2017

Let's say you have one or more IP routes that you don't want appearing in a router's IP routing table. The reason might be for security or for router performance, as a couple of examples. With OSPF, there are three primary ways to accomplish this route filtering:

This video discusses these three approaches, and it demonstrates the configuration of two of these approaches (because redistribution is a topic unto itself).
 
BGP Route Reflectors

ccie r/s ccnp r/s Aug 15, 2017 A BGP-speaking router, by default, will not advertise an Internal BGP (iBGP) route to an iBGP neighbor. One solution for this issue is to create a full mesh of neighborships within an Autonomous System (AS). However, that approach doesn’t scale well.

A more scalable solution is to use a BGP Route Reflector. That’s the focus of this new video I created for you. You’ll see the issue BGP has with iBGP-learned routes and how to overcome that issue with a BGP Route Reflector configuration.
 
Understanding EIGRP Part 6 (Router ID and Neighborship Requirements) 

Let's begin our discussion by considering the EIGRP router ID.

