[AusNOG] Asymmetric BGP question

[Nick @ Deltaband]

I can't say they definitely can see them, no. I'm just presuming they
do based on the transit confirming the customer (AS1's) routes are
being advertised at Equinix. Also the transit reaches AS2 via Equinix,
hence the outbound route.

If AS2 treats both routes the same (in terms of local pref) from
equinix and the directing peering with the transit in the US, the US
route will be the preferred one, it being an AS hop shorter right?

On Mon, Aug 3, 2009 at 7:22 PM, Matthew Moyle-Croft<mmc at internode.com.au> wrote:
> Can AS2 definately see AS1's prefixes at Equinix in Sydney?
> MMC
> On 03/08/2009, at 6:49 PM, Nick @ Deltaband wrote:
>
> Good idea.
>
> Sadly it seems AS2 don't publicly announce any supported communities,
> that i can find anyhow. Same goes for the transit provider... :(
>
> On Mon, Aug 3, 2009 at 7:10 PM, Matthew Moyle-Croft<mmc at internode.com.au>
> wrote:
>
> A good place to find community defs is ONESC's
>
> page: http://www.onesc.net/communities/
>
> MMC
>
> On 03/08/2009, at 6:11 PM, Sean K. Finn wrote:
>
> Can you use AS2's communities (If they have any) to influence how they
>
> return traffic to AS1 ?
>
> E.g. take a look at Jason Sinclair from Pipe Networks presentation from
>
> AUSNog last year on Communities.
>
> http://www.ausnog.net/media/images/ausnog-02/presentations/AusNOG02-Sinclair-BGP%20Communities.pdf
>
> Community attributes stack, so you can tag AS1:community and AS2:community
>
> to influence how AS2 treats your routes, and yes it works multiple hops
>
> away, as long as any intermediaries aren't stripping community tags.
>
> -S
>
> -----Original Message-----
>
> From: ausnog-bounces at lists.ausnog.net
>
> [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Nick @ Deltaband
>
> Sent: Monday, 3 August 2009 6:28 PM
>
> To: ausnog at ausnog.net
>
> Subject: [AusNOG] Asymmetric BGP question
>
> Hi,
>
> So i have this BGP problem...
>
> Traffic going between AS1 and AS2 has an asymmetric path of latency and
>
> doom.
>
> On the outbound path it goes something like this:
>
> AS1 > Transit Provider(AS1) > Equinix Sydney > AS2 - Perfect all is
>
> kept nicely on this side of the pacific.
>
> The return path is like this:
>
> AS2 > Transit Provider(AS1) > AS1 - The transit provider peers
>
> directly with AS2. Great. The problem is, it's in the US. So the
>
> traffic on the return path is laggy as hell because it's got to cross
>
> the pacific twice.
>
> You'd think AS2, that's predominately based in Australia, would be
>
> localpref'ing routes learnt from Australian IX's over US IX's but I
>
> guess they probably have their reasons not to.
>
> My question is: Other than asking the transit provider for AS1 to add
>
> an AS path prepend to the route being advertised to AS2 in the US, do
>
> I have any other options?
>
> MED would only work if the transit provider peered with AS2 directly
>
> in Aus as well right? Rather than via Equinix?
>
> Cheers,
>
> Nick
>
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> --
>
> Matthew Moyle-Croft
>
> Networks, Internode/Agile
>
> Level 5, 162 Grenfell Street, Adelaide, SA 5000 Australia
>
> Email: mmc at internode.com.au    Web: http://www.on.net
>
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> --
> Matthew Moyle-Croft
> Networks, Internode/Agile
> Level 5, 162 Grenfell Street, Adelaide, SA 5000 Australia
> Email: mmc at internode.com.au    Web: http://www.on.net
> Direct: +61-8-8228-2909      Mobile: +61-419-900-366
> Reception: +61-8-8228-2999        Fax: +61-8-8235-6909
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