There is one setup where you would need default route from your provider. If you have no IBGP between two sites and your prefix is a large /16 on side and maybe a /18 from that /16 on another site. These site would not be able to talk to each other if you orginate from the same AS. Other than that I see not harm in having both default and a full table since longest prefix match will always win even if you have 2 or more transits. // Andreas Med vänlig hälsning Andreas Larsen IP-Only Telecommunication AB| Postadress: 753 81 UPPSALA | Besöksadress: S:t Persgatan 6, Uppsala | Telefon: +46 (0)18 843 10 00 | Direkt: +46 (0)18 843 10 56 www.ip-only.se<https://webmail.ip-only.net/owa/UrlBlockedError.aspx> 5 nov 2014 kl. 02:41 skrev Chris Rogers <crogers@inerail.net<mailto:crogers@inerail.net>>: 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@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@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@nanog.org] On Behalf Of Berry Mobley Sent: Tuesday, November 04, 2014 12:47 PM To: nanog@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