Re: solving problems instead of beating heads on walls

[Andy Dills <andy () xecu net>]

On Sat, 27 Jul 2002, Brad Knowles wrote:

> >  Responsible and overall best: connect to the same 2+ providers in both
> >  locations and announce more specifics locally in each region/city/whatever
> >  with no-export.
>
>       As said above, this isn't possible.  I'd like to learn what could
> be done in this kind of situation that would allow the desired
> redundancy, while also being responsible.
>
>       I'm not a manager of a large network (where I might have this
> kind of problem myself), nor am I employed at a large ISP (where my
> customers might have this kind of problem).  But I would like to
> learn.

It depends on the quality of intra-AS connectivity.

In situations such as Ralph's, where intra-AS connectivity is strong, it
has been shown that there is a technique to allow for the weaker transit
link to be only used for backup: conditional BGP announcements and a gre
tunnel over the transit links in both cities.

Andy

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