Re: Networks ignoring prepends?

[Tom Beecher <beecher () beecher cc>]

> 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.

It's almost as if you've done this before. :)

Community : 3356:3 3356:22 3356:100 ==> 3356:123 <++ 3356:575
3356:903 3356:2011 3356:11918 47787:1020
47787:3090 47787:3690 47787:30000
Cluster : 0.0.7.15 0.0.7.19
Originator Id : 4.69.181.14 Peer Router Id : 4.69.130.10
Fwd Class : None Priority : None
Flags : Used Valid Best IGP Group-Best
Route Source : Internal
AS-Path : 47787 47787 47787 47787 53356 11875 11875 11875

3356:123 = Customer


On Mon, Jan 22, 2024 at 5:45 PM Owen DeLong via NANOG <nanog () nanog org>
wrote:

> 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/