T3 or not to T3
Avi Freedman
freedman at netaxs.com
Mon Jul 22 05:42:01 UTC 1996
> It's pretty easy to enforce "no transit" at the packet filtering level
> -- only packets destined for my nets will be allowed in. Is there some
> other aspect of filtering I'm forgetting about? We have a dedicated
> and backup network engineer at any rate. The border router would be a
> cisco 7200 or 7500 series with 128Mb.
>
> Dean
Hmm... If you do provide transit for others, making a dynamic filter
can be difficult if you base transit on as-path filters rather than
route filters.
I hear that Sprint, one of the few large providers (that imposes filters
on customer BGP sessions) that still bases customer peering filters on
as-path filters rather than on a per-session route filter list either
manually constructed or built automagically from databases, is considering
going or is going to go to route filtering its customer sessions rather
than as-path filtering. Now, I'm talking here about the BGP sessions,
not the actual flow of data. And it's been a long weekend, sorry if that
sentence was hard to parse.
Avi
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