If you mention BGP confederations in a group of network engineers, you’ll get a split reaction. Some people will immediately recognize what they are and nod knowingly. Others will tilt their head slightly like a dog that heard a strange sound. Both reactions are completely reasonable. Confederations solve the same problem as route reflectors, which
BGP Confederations Explained: The Dark Art of Splitting Your AS Read More »
Here’s the scenario. You configure iBGP between your edge routers and your internal routers. Sessions come up. You see routes in the BGP table. Everything looks right. And then you ping a destination that should be reachable and it fails. show bgp ipv4 unicast x.x.x.x/y shows the route. show ip route x.x.x.x shows the route in the routing
What Is Next-Hop Self and Why Is It the First Thing You Break? Read More »
You just finished reading about the iBGP full mesh problem. You understand the math. You know why full mesh doesn’t scale. Route reflectors are the solution most networks actually use. They’re not complicated once you understand what problem they’re solving and how the loop prevention works. But implement them without understanding those two things and
Route Reflectors: The BGP Feature That Saved Your Sanity (Eventually) Read More »