Networks ignoring prepends?

Mon Jan 22 22:43:48 UTC 2024

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 at herrin.us> wrote:
> 
> On Mon, Jan 22, 2024 at 10:19 AM James Jun <james.jun at 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 at herrin.us
> https://bill.herrin.us/