IP routing
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... routing and forwarding inside
the VN, due to the IP routing dependence on references to interfaces
and next-hop ...
... support VN routing, especially dynamic routing based on existing IP
routing protocols.
Both IIPtran ...
... tunnel mode SAs that specify port selectors would
operate under this scheme, since IP routing has no dependence on
transport-layer fields.
...
... SAs are not represented as interfaces, and thus
invisible to IP routing protocols.
Additionally, the forwarding lookup ...