Interesting discussion..just to check out some of my queries.Does GRE has or supports any mechanism for symmetrical path traffic.Eg: Site A sends out loadbalanced traffic by ospf through two upstream provider routers & has 2 GRE tunnel to the other end.Will the return traffic back to site A follow the same path as it went out(either link1 or link2)or once it reaches within PE mpls cloud...it would just end up using more of one of the links?Thanks.
If you're running OSPF across 2 GRE tunnels as you describe, then OSPF should route across them as it would with any other p-2-p links. If they have different cots, OSPF should take the less expensive path. If they have equal costs, OSPF should use both. Return traffic should be an independent forwarding decision. I.e., traffic might, or might not, return on the same GRE tunnel.
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