[AusNOG] Asymmetric BGP question

[Sean K. Finn]

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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