"George Bonser" <gbon...@seven.com> writes: >> -----Original Message----- >> From: Bret Clark >> Sent: Friday, December 10, 2010 7:08 AM >> To: nanog@nanog.org >> Subject: Re: BGP multihoming question. >> >> On 12/10/2010 10:01 AM, Dylan Ebner wrote: >> > 3. You cannot trust the second isp to advertise the SWIP block >> correctly if they are not a tier 1. Even though they may advertise it >> for you to their upstream, they don't always have the appropriate >> procedures in place to get the LOAs to the upstream so your block just >> gets filtered out. >> > >> > >> > >> Just got done battling this exact issue with one of our upstream >> peers...caused a lot of headaches for us. > > Proper registration in a routing registry helps, too.
As does, frankly, having an ISP with a clue... and purported "tier" has little to do with it. -r