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2. Traffic Classification

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Original RFC Text​

2.  Traffic Classification

   The Traffic Classification Data Item represents a list of flows that
   may be used at the same time to provide different service classes for
   traffic sent from a router to a modem.  The data plane information
   used to identify each flow is represented in a separate Sub-Data
   Item.  The Data Item and Sub-Data Item structures are intended to be
   independent of any specific usage of the flow identification, e.g.,
   flow control.  The Sub-Data Item structure is also intended to allow
   for future traffic classification types, e.g., 5-tuple flows.  While
   the structure of the Data Items is extensible, actual flow
   information is expected to be used in an extension-dependent manner.
   Support for DSCP and PCP-based flows is defined via individual Sub-
   Data Items; see below.  Other types of flow identification, e.g.,
   based on IP transport-layer protocol and ports, may be defined in the
   future via new Sub-Data Items.  Note that when extensions supporting
   multiple Sub-Data Item types are negotiated, these types MAY be
   combined in a single Data Item.

   Each list of flows is identified using a "Traffic Classification
   Identifier" or "TID" and is expected to represent a valid combination
   of data plane identifiers that may be used at the same time.  Each
   flow is identified via a "Flow Identifier" or "FID".  Each FID is
   defined in a Sub-Data Item that carries the data plane identifier or
   identifiers used to associate traffic with the flow.  A DLEP
   destination address is also needed to complete traffic classification
   information used in extensions such as flow control.  This
   information is expected to be provided in an extension-specific
   manner.  For example, this address can be provided by a modem when it
   identifies the traffic classification set in a Destination Up Message
   using the Credit Window Association Data Item defined in [RFC9893].
   TID and FID values have modem-local scope.
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