The number of external routes
Case 2 means that we will have 130M routes
- When will we encounter such situation?
- Will can future routers handle such a number of routes?
- No one knows…..
Since each AS holder announces at least one route, it would be better to allocate as less blocks as possible per an AS holder.
- 10K AS times (average) 2.0 prefixes/AS = 20K prefixes
- 100K AS times (average) 3.0 prefixes/AS = 300K prefixes
Notes: punching holes of /48 etc would heavily affect the number of external routes, if happened