A company is deploying BGP multihoming to provide internet connection redundancy. Which method can be used to avoid the internet transit routing situation?
- deploying iBGP routing in all routers within the local AS
- ensuring that no IGP session is running on the local BGP routers
- designating a data center or a specific location to handle the internet transit traffic
- applying outbound BGP route policies that only allow for local BGP routes to be advertised
| Answers Explanation & Hints:
If an enterprise uses BGP to connect with more than one service provider, it runs the risk of its autonomous system (AS) becoming a transit AS. Because BGP uses path cost to select best path, a path through the internal BGP routers might appear with a better path cost, hence the risk of local AS providing transit routing to everyone in the internet. Transit routing can be avoided by applying outbound BGP route policies that only allow for local BGP routes to be advertised to other autonomous systems. |