BGP multihoming question.

Sat Dec 11 12:54:03 UTC 2010

"George Bonser" <gbonser at seven.com> writes:

>> -----Original Message-----
>> From: Bret Clark 
>> Sent: Friday, December 10, 2010 7:08 AM
>> To: nanog at 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