[AusNOG] steering inbound BGP (Telstra)

[Joshua D'Alton]

Whoops completely forgot about localpref!

@Andrew  2x24/s wouldn't work for Telstra inbound though as they'd still be
preferring their learned /23 from their customer vs the 2x/24s from their
peer(s), right? Or do you mean it would work for making the majority of the
traffic come in via the other provider?


On Mon, Feb 17, 2014 at 2:37 PM, Matthew Moyle-Croft <mmc at mmc.com.au> wrote:

>
> On 16 Feb 2014, at 7:15 pm, Joshua D'Alton <joshua at railgun.com.au> wrote:
>
> > I could be wrong but BGP just doesn't support what you're wanting, and
> even more so no carrier is ever really going to work in the way you
> describe. It should never make sense (for a carrier) to not prefer their
> own routes (which are directly connected, ie admin dist 1), vs those of
> their peers (even if settlement free, admin dist 1+N), even if communities
> were involved (i believe telstra do use communities internally between
> telstra/telstraglobal/reach).
>
> A lot of transit providers allow you to use communities to alter the
> localpref of your routes within their network so they prefer, for example,
> peers over directly connected.
>
> eg. https://www.us.ntt.net/support/policy/routing.cfm with the 2914:4xx
> communities.
>
> Telstra's AS1221 network is devoid of communities for customers though.
>  They have been asked to provide them and just don't.
>
> MMC
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