RSVP supports unicast and multicast sessions
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QoS requirements are communicated through a network via a flow specification from receiver to sender
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Session set-up
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(1) receiver joins a multicast group using IGMP
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(2) sender sends RSVP path message to the IP destination address
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(3) receiver starts sending appropriate reservation request messages specifying the desired flow descriptors using RSVP
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(4) sender starts sending data
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