[AusNOG] Asymmetric BGP question

[Matthew Moyle-Croft]

Hi,
Yes - that'd be the case.  It's the main issue with the MLPA peering  
in Oz - the extra AS hop makes things complex when you've moved beyond  
just MLPA peering.

MMC

On 03/08/2009, at 7:03 PM, Nick @ Deltaband wrote:

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