nanog mailing list archives
Re: Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing?
From: Douglas Fischer <fischerdouglas () gmail com>
Date: Thu, 20 Oct 2022 09:51:14 -0300
If your Upstream(Transit provider) prepends your routes without you asking or authorizing it to do so, you should SERIOUSLY consider switching providers! In the other email I talked about traffic engineering BGP communities. If those prepends were made from some community you were applying... OK, that's great! Even better if you could apply a community that did something like "apply 2 prepends for south america only". But a Transit Provider changing the AS-PATH (in addition to the mandatory hop) arbitrarily without your consent is not for good people. P.S. Your email replies are breaking threads in email readers. I suggest you review the email client tool. Em qui., 20 de out. de 2022 às 09:16, Pirawat WATANAPONGSE via NANOG < nanog () nanog org> escreveu:
Dear all, Before all else: thank you all for the lightning-fast responses (even taking the time zone advantage into account). I really, really, really appreciate all your recommendations. Virtually all of you recommend prepending as the first choice. I also get the feeling that you guys consider de-aggregation “distasteful” (at the least) but sometimes unavoidable. I have considered the prepending myself, but dare not implement it yet for the fear that BGP (Human) Community will burn me alive, witch-hunt style, because of the following reasons: 1. I can see from looking glass(es) that my upstreams already practice prepending (some paths) at their level (at least 3 more hops [x4]), supposedly to “balance” their bandwidth. 2. Should I start prepending mine, I might upset their balance, causing them to prepend more, thus starting a “prepend war”. [I imagine that x20+ prepending starts out this way] The way I see it, prepending (or maybe even the whole BGP-Path thing) is a local-optimization problem: it’s only best for someone, not globally. And the Higher-Tiers (Lower Tier-Numbers) will always “engineer” me in the end. Worse yet, I might be out-voted by de-aggregation insider “cultists” anyway. Which forces me to proactively ask you guys questions about ROV-Overlapping and ROV “Hijack Gap” soon, in another posting with separate “Subject:”. Again, Thank you. Cheers, Pirawat. P.S. [Off-Topic] Any comment on the “SCION” System? Any good (I will even take "academically")? [Reference: https://scion-architecture.net/]
-- Douglas Fernando Fischer Engº de Controle e Automação
Current thread:
- RE: Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? Pirawat WATANAPONGSE via NANOG (Oct 20)
- Re: Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? Douglas Fischer (Oct 20)
- Re: Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? Tom Beecher (Oct 20)
- Re: Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? William Herrin (Oct 20)