[AusNOG] Megaport IX Sydney - Sudden grows in number of prefixes

[John Alexander]

I tried this, with 3:6939 which added 3 prepends to he (which I could 
see at HE's LG) but TPG still preferred to send traffic via he rather 
than transit, even though the path was longer...

ughhh


On 01/12/2018 08:52 AM, Philip Loenneker wrote:
> Note that you can also use BGP communities to adjust how the IX advertises your subnets to individual peers using the documentation here:
> https://www.ix.asn.au/peering-technical/
> Unfortunately you can't set a community of 0:7545 to avoid advertising your routes to TPG, as they aren't the direct peer - you would need to block advertising to HE using 0:6427. It may be sufficient for you to prepend the routes being advertised to HE, using 3:6427, to reduce the amount of traffic taking that path, but still keeping it available.
>
> -----Original Message-----
> From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Bill Walker
> Sent: Friday, 12 January 2018 8:11 AM
> To: John Alexander <johna at wideband.net.au>
> Cc: ausnog at lists.ausnog.net
> Subject: Re: [AusNOG] Megaport IX Sydney - Sudden grows in number of prefixes
>
> Filter based on the AS Path?
>
> If the path is:
>
> You <- 58941 <- 6427 <- 7545
>
> You <- MegaIXSyd <- HE <- TPG
>
> In the Cisco world, I would use
>
> ip as-path access-list 10 deny ^58941_6427_7545$
>
> (The ASN's here may not be exactly what is in use, you will need to check your received prefixes)
>
> On 2018-01-12 09:46, John Alexander wrote:
>> With this, does anyone know of a way of keeping HE routes, but
>> excluding a specific one, namely TPG 7545 which is a direct customer
>> of HE. Traffic from them goes from Syd -> LA -> Syd -> he peering ->
>> me.  I'd prefer to just make them stay at home so to speak instead of
>> going around the world.  We don't peer at Pipe which would be the only
>> other place to connect to tpg.
>>
>> John
>>
>> On 01/11/2018 05:55 PM, Nathan Le Nevez wrote:
>>
>>> I assume it was Hurricane Electric...IPv6 routes are now at 21843 too
>>>
>>> Nathan
>>>
>>> -----Original Message-----
>>> From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of
>>> Paul Holmanskikh
>>> Sent: Thursday, 11 January 2018 5:00 PM
>>> To: ausnog at lists.ausnog.net
>>> Subject: [AusNOG] Megaport IX Sydney - Sudden grows in number of
>>> prefixes
>>>
>>> G'day,
>>>
>>> Number of prefixes we are receiving from Megaport IX in Sydeney
>>> suddenly jumped to 40493.
>>> At lest 100% grow.  Any ideas what happened.
>>>
>>> as_path    count
>>> 36351    945
>>> 4739    909
>>> 9443    658
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