4byte As Number Migration Suggestion

The document summarizes suggestions for migrating to 4-byte AS numbers in BGP. It discusses upgrading routers in a network in stages, beginning with either border routers, route reflectors, or iBGP clients. While this approach is acceptable, operational issues still need to be considered, such as how to handle AS paths if a border router does not support 4-byte AS numbers. The document provides examples of different upgrading strategies and considerations for various common BGP configurations.