nanog mailing list archives

Re: Junos Asymmetric Routing


From: Ken Gilmour <ken.gilmour () gmail com>
Date: Fri, 28 May 2010 09:21:43 -0600

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.


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