Default routes on BGP routers with full feeds

Owen DeLong owen at
Tue Nov 4 22:42:18 UTC 2014

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.


> On Nov 4, 2014, at 10:25 AM, Mike Walter <mwalter at> 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] On Behalf Of Berry Mobley
> Sent: Tuesday, November 04, 2014 12:47 PM
> To: nanog at
> 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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