[184010] in North American Network Operators' Group
Re: Service Providers behaviour for dual homed enterprises
daemon@ATHENA.MIT.EDU (Clinton Work)
Thu Sep 24 03:17:02 2015
X-Original-To: nanog@nanog.org
From: Clinton Work <clinton@scripty.com>
To: nanog@nanog.org
Date: Thu, 24 Sep 2015 01:16:59 -0600
In-Reply-To: <CALZ5zxgNp5FOJAen-3pKT0m6r1Oz=Ep6-BtK9GjOqUL0b6BQ+Q@mail.gmail.com>
Errors-To: nanog-bounces@nanog.org
Many transit providers support BGP communities to modify how your
announced routes are treated within their network. A quick search shows
that AT&T supports BGP community 7018:70 to lower the default local-pref
100 down to 70 (below peer routes). If you tag your AT&T announced
routes with BGP community 7018:70, then even AT&T customers should
prefer to enter via Verizon.
Clinton.
On Wed, Sep 23, 2015, at 03:38 PM, Jason Bullen wrote:
> So if my research is correct, the internet prefers Verizon UNLESS they
> are
> a direct AT&T customer then they would use the AT&T circuit.
> Is this a standard practice that I should assume to encounter?
>
> Thanks in advance
