[AusNOG] steering inbound BGP (Telstra)

[Joshua D'Alton]

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).

Even if you advertised /24s telstra would still use their own learned
routes (from you) rather than peer learned routes (from your alternate
upstream), as designed BGP.

I don't know for sure it is default behaviour for TWI, but I believe it is
default for... the internet in general.

I think the only way to achieve what you want would be to engineer the
system such that nothing is advertised to telstra, and only advertised if
the other link goes down. I can think of a few ways to do this, but keeping
in mind BGP announce times, it wouldn't be a 100% uptime.

Good luck with the traffic engineering, there are definitely a few onlist
that are experts.


On Mon, Feb 17, 2014 at 1:59 PM, Chris Gibbs <Chris.Gibbs at gosford.nsw.gov.au
> wrote:

>  Hey all,
>
>
>
> We currently utilise Telstra Internet Direct services for our primary
> inbound for AS38236, I would like to move to using Telstra as the least
> preferred and swap to another provider for inbound.
>
>
>
> When I tested the swap, the majority of domestic looking glasses were
> confirming inbound through our preferred inbound. However Telstra always
> seems to prefer their own routes instead of peer learnt; even after setting
> either as-prepend or MED. A Telstra engineer confirmed this.
>
>
>
> My question is pretty much is there any other way to steer inbound traffic
> to us through Telstra? (without grabbing a /23 and advertising more
> specific 2 x /24s or using communities, which Telstra doesn't support)
>
>
>
> The only other alternative would be to swap providers at our DR site, and
> we originally had issues getting a service installed there.
>
>
>
> Does anyone also know if this is the default behaviour through Telstra
> Wholesale Internet?
>
>
>
> Cheers ,
>
>    [image: Gosford City Council Website] <http://www.gosford.nsw.gov.au>
>
> Chris Gibbs
> Network and Security Engineer | Information Management & Technology
> Gosford City Council
> (PO Box 21)
> Gosford NSW 2250
> P  (02) 43258888
> M  0408 222 496
> E  Chris.Gibbs at gosford.nsw.gov.au
>
>
>
>
>
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