[AusNOG] Asymmetric BGP question

[Matthew Moyle-Croft]

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
Direct: +61-8-8228-2909		     Mobile: +61-419-900-366
Reception: +61-8-8228-2999        Fax: +61-8-8235-6909

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