Re: Networks ignoring prepends?

[Owen DeLong via NANOG <nanog () nanog org>]

BGP is more of a PDVP (Policy Distance Vector Protocol). Policy will always override Distance in BGP and is pretty much 
the key difference between an EGP and an IGP. 

Once you recognize that, the rest makes much more sense. 

Owen


> On Jan 23, 2024, at 14:29, William Herrin <bill () herrin us> wrote:
>
> On Tue, Jan 23, 2024 at 12:34 PM Niels Bakker <niels=nanog () bakker net> wrote:
> > BGP, while a distance vector protocol, famously does not take
> > latency into account when making routing decisions.
>
> Unless overridden, BGP takes -distance- into account where distance =
> AS path length.
>
> Centurylink has overridden that with a localpref so that it DOES NOT
> take distance into account. Which rather defeats the function of a
> distance vector protocol.
>
> Regards,
> Bill Herrin
>
>
> --
> William Herrin
> bill () herrin us
> https://bill.herrin.us/