[126753] in North American Network Operators' Group
Re: Junos Asymmetric Routing
daemon@ATHENA.MIT.EDU (Ken Gilmour)
Fri May 28 11:23:32 2010
In-Reply-To: <4BFFC050.1080705@brightok.net>
From: Ken Gilmour <ken.gilmour@gmail.com>
Date: Fri, 28 May 2010 09:21:43 -0600
To: Jack Bates <jbates@brightok.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi Jack
On 28 May 2010 07:08, Jack Bates <jbates@brightok.net> wrote:
>
> Your BGP config with ISP2 is probably unideal. This has lead to packets
> coming in via ISP2 despite the fact you prefer to use ISP1. Often, people
> only do AS Prepend to alter traffic patterns. However, if a packet finds
> it's way to your directly connected ISP, an AS Prepend is not enough. It
> will be sent to you based on local preference. Setting appropriate
> communities with your ISP can often override this preference so they will
> send the packet towards your ISP1 instead of direct.
>
> Strangely, BGP actually works without issues. The only issue is with
statically routed ranges.
