Filter specs may select arbitrary subsets of the packets in a given session.
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Subsets might be defined in terms of
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Senders (i.e., sender IP address and generalized source port),
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A higher-level protocol
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Any fields in any protocol headers in the packet.
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Example: filter specs might be used to select different subflows in a hierarchically-encoded signal by selecting on fields in an application-layer header.
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Current RSVP software does not yet support this option.
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Because the UDP/TCP port numbers are used for packet classification, each router must be able to examine these fields.
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