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

[Philip Loenneker]

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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