September 14, 2021 by Admin
Your VPC has a DX connection that is advertising 99 routes. You have two more prefixes to add: 10.223.1.0/24 and 10.223.2.0/24. You have several locations, so you need to be as exact as possible with your routing.
How would you do this?
- Add the prefixes; AWS allows for as many BGP routes as you need but not static.
- Contact AWS to extend the number of prefixes you are allowed to advertise.
- Summarize the routes into a 10.223.0.0/22 and advertise that route instead.
- Summarize the routes into a 10.223.0.0/12 and advertise that route instead.
BGP has a strict 100 prefix limit. 10.223.0.0/12 includes both routes but is not very specific. 10.223.0.0/22 is the proper summarization of both routes.