From: Kate Gerry Sent: Tuesday, April 26, 2011 9:39 AM To: 'Justin M. Streiner'; nanog@nanog.org Subject: RE: IPv6 Prefix announcing
Funny enough, some carriers actually require the 'smallest' as being /32... :(
That might be true in PA space, but PI space is issued down to /48. I am not aware of anyone who filters smaller than a /32 in PI space though that doesn't mean it doesn't happen. The largest holdout was Verizon but my understanding is they now accept a /48 in PI space. So: A /32 is the smallest prefix issued in PA and some networks will not accept a prefix smaller than /32 from PA address space. A /48 is the smallest prefix issued in PI and some networks will not accept a prefix smaller than /48 from PI address space. In other words, if you are going to attempt to multihome a /48 allocation from your provider's aggregate, you are better off getting your own provider independent block.