Re: [routing-wg] Annoucing supernets in BGP?

* Michael Markstaller:

Is it good/best practice for Swisscom to announce 80/5 into BGP ?

IIRC, Swisscom does this so that its customers can use routers which are not capable of processing the original DFZ, and still have some redundancy. The advertisements should not leak to the general Internet. If the prefixes end up in RIS, this could come from leakage by a Swisscom customer (and another upstream which doesn't filter properly), or a misconfigured BGP peering for the RIS data feed.