On Jun 10, 2013, at 12:08 PM, Patrick W. Gilmore <patr...@ianai.net> wrote:
>> however, providers a/b at site1 do not send us the two /24s from >> site b.. > > This is probably incorrect. > > The providers are almost certainly sending you the prefixes, but your router > is dropping them due to loop detection. To answer your later question, this > is the definition of 'standard' as it is written into the RFC. > > Use the allow-as-in style command posted later in this thread to fix your > router. I've done this many places, and find allow-as-in can be, uh, problematic. :) Everyone says to just turn it on, but it's possible to get some strange paths in your table that way, in some circumstances. For most users having a default route is just as good of a solution. Each site will have a full table minus the small number of prefixes at the other site, and a static default will get packets to your upstream that has those routes. Don't like a default? Just static the netblocks at the other side to a particular provider. Already have a default because you weren't taking full tables? You're good to go, no special config needed. Of course it depends on what your site-to-site requirements are, if they are independent islands or talking to each other with critical data all the time. -- Leo Bicknell - bickn...@ufp.org - CCIE 3440 PGP keys at http://www.ufp.org/~bicknell/
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