Default routes on BGP routers with full feeds

Wed Nov 5 11:52:58 UTC 2014

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On Nov 5, 2014, at 7:49 AM, Andreas Larsen <andreas.larsen at ip-only.se> wrote:

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.

I think in that case you would use “allowas-in”.

Regards,

Marc
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