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

[McDonald Richards]

Pretty sure there are no rules....

On Fri, Jan 12, 2018 at 9:08 AM, Philip Loenneker <
Philip.Loenneker at tasmanet.com.au> wrote:

> Traffic engineering is difficult when people don’t play by the rules…
>
>
>
> Perhaps using the HE community strings which Jacob suggested would be more
> helpful – you may be able to prevent HE advertising your subnets to TPG.
> Unless NSW-IX remove all community strings when they go to peers….
>
>
>
> *From:* AusNOG [mailto:ausnog-bounces at lists.ausnog.net] *On Behalf Of *John
> Alexander
> *Sent:* Friday, 12 January 2018 9:04 AM
> *To:* ausnog at lists.ausnog.net
>
> *Subject:* Re: [AusNOG] Megaport IX Sydney - Sudden grows in number of
> prefixes
>
>
>
> 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 <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> <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 <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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