Default routes on BGP routers with full feeds

Chris Rogers crogers at inerail.net
Wed Nov 5 01:41:43 UTC 2014


We don't accept a default from anyone, but will send one to a customer when
specifically requested.

We heavily filter all incoming routes (bogon, 1918, and many others). We
don't want data resorting to 0/0 and ::/0 when we specifically rejected the
matching route at the import policy.

Additionally, if your upstream isn't announcing a route to you, where are
they going to send your traffic anyway?

Regards,
Chris Rogers
+1.302.357.3696 x2110
http://inerail.net/

On Tue, Nov 4, 2014 at 5:42 PM, Owen DeLong <owen at delong.com> wrote:

> It seems in such a case, the traffic still doesn’t know where to go, but
> you don’t realize it because you have a default.
>
> Then you pass the traffic to one of the providers who doesn’t have a route
> for it and they drop it instead of you.
>
> If you see something different, then, by definition, said provider is not
> feeding you a full set of their tables, or, they, too, are depending on a
> default and are not receiving a full set of tables.
>
> Owen
>
> > On Nov 4, 2014, at 10:25 AM, Mike Walter <mwalter at 3z.net> wrote:
> >
> > I have 5 providers and we get the default from all of them and full
> routing tables.
> >
> > I have seen cases where if there is no default route, the traffic didn't
> know where to go, even with full routes from all my providers.
> >
> > -Mike
> >
> > -----Original Message-----
> > From: NANOG [mailto:nanog-bounces at nanog.org] On Behalf Of Berry Mobley
> > Sent: Tuesday, November 04, 2014 12:47 PM
> > To: nanog at nanog.org
> > Subject: Default routes on BGP routers with full feeds
> >
> > I'm wondering how many of you who are multihomed also add default
> > routes pointing to your providers from whom you are receiving full feeds.
> >
> > If so, why? If not, why not?
> >
> > Thanks,
> >
> > Berry
>
>


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