[AusNOG] Inbound BGP traffic balancing

Andrew Khoo Andrew.Khoo at amaysim.com.au
Mon Feb 27 23:23:18 EST 2017

cue "polluting the BGP table" statements.....

From: AusNOG <ausnog-bounces at lists.ausnog.net> on behalf of Tim Raphael <raphael.timothy at gmail.com>
Sent: Monday, February 27, 2017 3:35:34 PM
To: Matt Selbst
Cc: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Inbound BGP traffic balancing

Hey Matt,

Another option is to split your advertisements, if you have a /23, advertise two /24s out separate connections and also the /23 incase a peer breaks.
I’m not sure if that’s what you meant by “smaller prefixes” but it’s another way.

I’ve never done this before in prod but it’s a fairly usual occurrence for enterprises with a smaller number of IPs and destinations.

- Tim

On 27 Feb 2017, at 3:27 pm, Nathan Brookfield <Nathan.Brookfield at simtronic.com.au<mailto:Nathan.Brookfield at simtronic.com.au>> wrote:

Your best option is to AS-PATH-PREPEND the better of the two carriers until you get a good balance, adding one AS hop to the outbound announcement is usually enough to make a fair difference but there is no way to ensure 50/50, it's just not going to happen especially if one of your upstream's is a carrier like Vocus who are well peered across the world.

Kindest Regards,
Nathan Brookfield (VK2NAB)

Chief Executive Officer
Simtronic Technologies Pty Ltd

Local: (02) 4749 4949 | Fax: (02) 4749 4950 | Direct: (02) 4749 4951
Web: http://www.simtronic.com.au<http://www.simtronic.com.au/> | E-mail: nathan.brookfield at simtronic.com.au<mailto:nathan.brookfield at simtronic.com.au>

From: AusNOG <ausnog-bounces at lists.ausnog.net<mailto:ausnog-bounces at lists.ausnog.net>> on behalf of Matt Selbst <matt.j.selbst at gmail.com<mailto:matt.j.selbst at gmail.com>>
Sent: Monday, 27 February 2017 3:22 PM
To: ausnog at lists.ausnog.net<mailto:ausnog at lists.ausnog.net>
Subject: [AusNOG] Inbound BGP traffic balancing

Hi All,

I've currently got transit from two of the major carriers and it seems that if I don't do any manipulation BGP naturally makes about 90% of the traffic come through the one carrier and only ~10% through the other.

I've tried all the usual tricks like shorter prefixes, communities etc but not really getting much that I can rely on for even split.

Is there a much more reliable way of evenly balancing inbound traffic 50/50?  I'm open to commercial solutions if one exists.


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