Why IRR-based Filtering Fails?
Inability of shipping hardware to filter effectively on long lists
Large providers, whose peers can not filter them, have little incentive to ensure that their (or their customers’) routes are registered
Worries about publication of various information leads to non-participation
- existence or otherwise of peering agreements
- details of customers etc.
- concerns about service level, inter-IRR confusion, lack of mirroring (more RIPE than RADB)