Fixed-Filter (FF) style reservations.
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The flow descriptors for senders S2 and S3, received from outgoing interfaces C and D, are packed into the request forwarded to previous hop B.
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The three different flow descriptors for sender S1 are merged into the single request FF( S1{4B} ), which is sent to previous hop A.
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For each outgoing interface, there is a separate reservation for each source that has been requested, but this reservation is shared among all the receivers that made the request.
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