On an OVS and openflow enabled switch, GRE-tunnel is supported. Let's assume one packet comes in and hits a flow entry,
the action is forwarded to a GRE tunnel. After GRE tunnel encapsulation, a new tunnel header is added. How should the encapsulated packet be forwarded? By route or by manually specified tunnel outgoing port? if it's by route, how is the route created (assume on the switch, there is no any route protocols)? Manually create the route? In other words, on a openflow and ovs-l2 only switch, how to forward tunnel packet? Weifeng Zhang, Director of Software Engineering - Design Principle: Keep it Simple and Stupid
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