<div dir="ltr">If your Upstream(Transit provider) prepends your routes without you asking or authorizing it to do so, you should SERIOUSLY consider switching providers!<br><br>In the other email I talked about traffic engineering BGP communities.<br>If those prepends were made from some community you were applying... OK, that's great!<br>Even better if you could apply a community that did something like "apply 2 prepends for south america only".<br><br>But a Transit Provider changing the AS-PATH (in addition to the mandatory hop) arbitrarily without your consent is not for good people.<br><br><br>P.S. Your email replies are breaking threads in email readers. I suggest you review the email client tool.<br><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Em qui., 20 de out. de 2022 às 09:16, Pirawat WATANAPONGSE via NANOG <<a href="mailto:nanog@nanog.org">nanog@nanog.org</a>> escreveu:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Dear all,<br><br><br>Before all else:<br>thank you all for the lightning-fast responses (even taking the time zone advantage into account).<br>I really, really, really appreciate all your recommendations.<br><br>Virtually all of you recommend prepending as the first choice.<br>I also get the feeling that you guys consider de-aggregation “distasteful” (at the least) but sometimes unavoidable.<br><br>I have considered the prepending myself, but dare not implement it yet<br>for the fear that BGP (Human) Community will burn me alive, witch-hunt style,<br>because of the following reasons:<br>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.<br>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]<br><br>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.<br>And the Higher-Tiers (Lower Tier-Numbers) will always “engineer” me in the end.<br><br>Worse yet, I might be out-voted by de-aggregation insider “cultists” anyway.<br><br>Which forces me to proactively ask you guys questions about ROV-Overlapping and ROV “Hijack Gap” soon, in another posting with separate “Subject:”.<br><br>Again, Thank you.<br><br><br>Cheers,<br><br>Pirawat.<br><br><br>P.S. [Off-Topic] Any comment on the “SCION” System?<br>Any good (I will even take "academically")?<br>[Reference: <a href="https://scion-architecture.net/" target="_blank">https://scion-architecture.net/</a>]<br><div><br></div></div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Douglas Fernando Fischer<br>Engº de Controle e Automação<br><div style="padding:0px;margin-left:0px;margin-top:0px;overflow:hidden;color:black;text-align:left;line-height:130%;font-family:"courier new",monospace"></div></div></div>