On Tuesday, November 29, 2011 09:40:30 PM Gert Doering wrote: > Most ISPs these days do not seem to have customers that > use BGP-based multihoming using networks from the ISP's > PA blocks - but of course, exceptions happen (we have > one customer that uses an IPv6 /48 from our /32 due to > historic reasons).
We do have some customers that announce our own space back to us because they multi-home to us and need some kind of independent route control. However, we make it mandatory that we can only allow for this kind of scenario if the customer uses a private ASN to peer with us. If the customer has their own PI or PA space, chances are they have (or can easily get) a public ASN. If the customer has a public ASN and they want to multi-home with it, they should use their own PI or PA space to connect to us. This policy ensures that if customers ever announce our own routes back to us legally, those routes ALWAYS stay within our network, and never leak on to the Internet or to other eBGP peers. Keeps the global table lean and mean, keeps us good netizens. Mark.
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