Imagine the fairly common scenario quickly depicted here: https://imgur.com/N2wbwl2
I want to announce the same publicly assigned /16 out of two datacenters. The datacenters are connected with dark fiber and run OSPF as the IGP.
Do the two routers need to be connected to each other via a layer 2 link or a GRE tunnel for this to work (in addition to iBGP of course)?
I tried to convert a router to strictly layer 3 over the weekend with no L2 or tunnel between the two PE's and all heck broke loose. After doing some research, I believe it's because I broke the layer 2 connection between them (because I want to rid myself of all unnecessary layer 2 in the network).
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