> -----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.
