Monday, November 20, 2017

BGP - Same AS at multiple internet sites - allowas-in or iBGP?

I've got two sites in the US (different states) with BGP peering to different ISPs with our same AS. Both advertise different chunks of one of our /20's.

Site A gets full tables, site B just a default route (although this may change at some point).

Site A won't install any routes from Site B (via the internet) because it sees it's own AS in the path (this is expected).

I'm curious what people prefer in this situation. "allowas-in"? iBGP between my edge routers via the internet? Something else?



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