nanog mailing list archives
Re: Customer AS
From: Curtis Villamizar <curtis () ans net>
Date: Sat, 17 Aug 1996 07:57:02 -0400
In message <m0urb70-00080OC () rip psg com>, Randy Bush writes:
Not sure what you mean here concerning 'unroutable' prefixes, but the issue with obtaining an allocation for one of the upstream provider's CIDR block when multihomed *does* have its drawbacks, at least from the end-user perspective. If said prefix (let's say a /24) is announced in the 'allocating' provider's aggregate, and the more specific is announced via the 'other' provider, the more specific will always be preferred.This is brain damaged. Given AS1 ----- Sprint | | | | AS2 ----- anything else not Sprint You can not announce a bit of Sprint space AS1->AS2->MCI as a fallback (note the 'extra' AS hop) because Sprint aggregates your announcement and the longer prefix is announced to the world via <anything else>. Use Sprint space, bye bye fallback. To the best of my knowledge (which ain't that hot), all other providers have discovered suppress-map. randy
Randy, What are you saying is brain damaged? The idea of announcing a dual homed route as part of an aggregate? Or Sprint? You clearly want to avoid using space in any provider that is not willing to suppress your more specific when generating their aggregate, particularly since they can no longer pass the aggregate to you (with your AS in the as-set). We've seen this effect. Using your own aggregate and allowing a customer to dual home, leaving the alternate provider's contribution out of the aggregate is a certainly not brain damaged. Curtis - - - - - - - - - - - - - - - - -
Current thread:
- Customer AS Tim Crowell (Aug 15)
- Re: Customer AS Curtis Villamizar (Aug 15)
- <Possible follow-ups>
- Re: Customer AS Chris MacFarland (Aug 16)
- Re: Customer AS Curtis Villamizar (Aug 16)
- Re: Customer AS Sean Doran (Aug 17)
- Re: Customer AS Curtis Villamizar (Aug 16)
- Re: Customer AS Paul Ferguson (Aug 16)
- Re: Customer AS Randy Bush (Aug 16)
- Re: Customer AS Curtis Villamizar (Aug 17)
- Re: Customer AS Randy Bush (Aug 17)
- Re: Customer AS Dorian R. Kim (Aug 17)
- Re: Customer AS Paul A Vixie (Aug 21)
- Re: Customer AS Sean Doran (Aug 17)
- Re: Customer AS Henry Kilmer (Aug 21)
- Re: Customer AS Jon Zeeff (Aug 21)
- Re: Customer AS Michael Dillon (Aug 21)
- Re: Customer AS Avi Freedman (Aug 21)
- Re: Customer AS Randy Bush (Aug 16)
- Re: Customer AS Curtis Villamizar (Aug 21)
- Re: Customer AS Sean Doran (Aug 21)