* ssw@iu.edu (Steven Wallace) [Mon 24 Apr 2017, 16:51 CEST]:
We have dual-homed sites that only accept routes from their peers, and default to their transit provider. A site may receive a covering prefix from a peer, but since they are not accepting the full table from their transit provider they don’t see the covered (i.e., more specific). In some cases the peer announcing the covering prefix blackholes traffic to the covered prefix.
Is this accepted behavior, or should a peer announcing a covering prefix always delver packets to its covered routes?
A prefix announcement means a statement of capability and willingness to deliver packets to covered destinations. Any deviation is a hijack.
Does this happen often?
This is more common than it should be. -- Niels.