[isp-bgp] Will I be killed for not aggregating?

[Rick Kunkel <kunkel@...>]

Hello all,

I've been doing some readin lately, after having gotten a fairly basic BGP
setup going, and decided to finish up one of those RIPE slideshows that
I'd kinda faltered through before I knew anything.

Slides 106 to 111 are about aggregation, but the one that really caught my
eye was the last one, at:

http://www.ripe.net/ripe/meetings/archive/ripe-40/tutorials/bgp-tutorial/sld111.html

Supposing we have a /19 from ARIN, this means that they'd want us to
announce that as one announcement, right?

The only problem is that we've currently got our address space pretty
physically divided into two groups at two different NOCS that are
separated by a relatively small pipe.  If we announce that block to our
upstreams, I'm going to get a bunch of traffic that will opt for a path
through my network, across that small pipe, right?

Ideally, we'd like to make two (or MAYBE more) announcements...each a /20.
This way, we could make paths that traverse our network look a little
longer by padding our AS an extra time or something.

But, as far as I can understand it, if the granularity is set to a /19, I
just don't have that kind of flexibility, right?  (That's the THIRD
sentence i've ended that way....ARGH...)

(Of course, in an ideal world, I've have a much larger connection between
NOCS...)

Thanks,

Rick Kunkel







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