On Jun 10, 2013, at 12:08 PM, Patrick W. Gilmore <[email protected]> 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 - [email protected] - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
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