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

["Adam Debus" <adam@...>]

While it would be prefered that you announce just what you get from ARIN,
it's also generally fine to announce 2 /20s if they are both in seperate
physical locations, etc. What people mostly complain about is when people
take a /19 and advertise it as 32 /24s all out of the same POP.

Thanks,

Adam Debus
Network Engineer, ReachONE Internet
adam@...
----- Original Message ----- 
From: "Rick Kunkel" <kunkel@...>
To: <isp-bgp@isp-bgp.com>
Sent: Tuesday, February 17, 2004 11:08 AM
Subject: [isp-bgp] Will I be killed for not aggregating?


> 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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