How to advertise networks in BGP

[lagapidis (Lazarus Agapidis)]

Hello Networking_Philippin

When using the Null0 entry for an aggregate route, that entry will never be used, because you have more specific routes. Take a look at this post for more details:

Troubleshooting BGP Route Advertisement

Hello Tuyen In R1, we see the aggregate-address 172.16.0.0 255.255.0.0 command in the BGP configuration, and we want to send this aggregate address to BGP peers. This means that we must already have more specific routes in the routing table that we simply want to aggregate, such as 172.16.1.0/24 and 172.16.55.0/24 for example. These are not shown in the lesson, but would be there in a production environment. Remember, a routing table lookup will look up the most specific routes. So even wi…

I hope this has been helpful!

Laz