the basic picture

? set up an RSVP session between Rentry and Rexit

? encapsulate packets entitled for the reservations

with a UDP header (in addition to tunnel IP

header)

? intermediate RSVP routers unaware of tunnel existence

Rentry Rexit

packets with no reservations & end-to-end RSVP packets: tunnel IP

tunnel IP
packets with reservations:

original packet

UDP original packet