I’d bet that 47787 is a paying century link customer. As such, despite the ugliness of the path, CL probably local prefs everything advertised by them higher than any non-paying link. I’m willing to bet 1299 is peered and not paying CL. Sending bits for revenue is almost always preferable to sending bits for free, so… Owen
On Jan 22, 2024, at 12:37, William Herrin <bill@herrin.us> wrote:
On Mon, Jan 22, 2024 at 10:19 AM James Jun <james.jun@towardex.com> wrote:
So, as a customer, you actually SHOULD be demanding your ISPs to positively identify and categorize their routes using local-pref and communities.
Hi James,
The best path to me from Centurylink is: 3356 1299 20473 11875
The path Centurylink chose is: 3356 47787 47787 47787 47787 53356 11875 11875 11875
Do you want to tell me again how that's a reasonable path selection, or how I'm supposed to pass communities to either 20473 or 53356 which tell 3356 to behave itself?
Regards, Bill Herrin
-- William Herrin bill@herrin.us https://bill.herrin.us/