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Bi-directional IP Tunnel with RSPs
IP tunnel is often used in bi-directional mode in network
The RSP keys in IP Route Request can be used to tie both RSPs in opposite direction to form a bi-directional IP TE tunnel
Path message contains (source address, destination address, RSP key)
Resv message contains (IP TE host address)
IP tunnel encapsulation has the header of (source address, IP TE host address)
PPT Version