wet-behind-the-ears whippersnapper seeking advice on building a nationwide network

Seth Mattinen sethm at rollernet.us
Tue Sep 20 15:00:05 CDT 2011


On 9/20/11 12:24 PM, Dorn Hetzel wrote:
> On Sep 20, 2011 3:21 PM, "Owen DeLong" <owen at delong.com> wrote:
>>
>>>
>>> If you open the door to that sort of interpretation, then every org with
> a T1 and a backup dial-up connection can claim to be "multihomed".
>>>
>> You say that like it's a bad thing.
>>
>>> In either of these cases, it's not enough to just have the connection.
> The ARIN NRPM definition of Multihomed includes "has one or more routing
> prefixes announced by at least two of its upstream ISPs."  Are you really
> going to announce your prefix[es] to both your real provider _and_ your
> ridiculously low bandwidth provider?  Even if you prepend the latter
> considerably, you're likely to receive some traffic via that path.

Yes. I've done it before. As long as the provider supports BGP
communities to tweak localperf you won't get any traffic over it and you
won't even need to prepend once. Prepending is really only a last resort
if you got stuck with a dud provider that doesn't support communities.

~Seth



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