Re: Covering prefix blackholing traffic to one of its covered prefixes....

[Niels Bakker <niels=nanog () bakker net>]

* 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.