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/]