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2.1. Traffic Classification Data Item

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Original RFC Text​

2.1.  Traffic Classification Data Item

   This section defines the Traffic Classification Data Item.  This Data
   Item is used by a modem to provide a router with traffic
   classification information.  When an extension requires the use of
   any Data Item, the Data Items, including this Traffic Classification
   Data Item, SHOULD be included by a modem in any Session
   Initialization Response Message (e.g., see [RFC9893]).  Updates to
   previously provided traffic classifications or new traffic
   classifications MAY be sent by a modem by including the Data Item in
   Session Update Messages.  More than one Data Item MAY be included in
   a message to provide information on multiple traffic classifiers.

   The set of traffic classification information provided in the Data
   Item is identified using a TID.  The actual information related to
   data planes that is used in traffic classification is provided in a
   variable list of Traffic Classification Sub-Data Items.

   The format of the Traffic Classification Data Item is as follows:

        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       | Data Item Type                | Length                        |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |Traffic Class. Identifier (TID)|   Num SDIs    |   Reserved    |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       ~           Traffic Classification Sub-Data Item 1              ~
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       ~                              ...                              ~
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       ~           Traffic Classification Sub-Data Item n              ~
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   Data Item Type:
      29

   Length:
      Variable

      Per Section 11.3 of [RFC8175], Length is the number of octets in
      the Data Item, excluding the Data Item Type and Length fields.
      The length here is limited by the packet data unit (PDU) length
      supported.  For example, if the packet is limited to 1400 bytes,
      then the length MUST NOT exceed this value.  If larger packets are
      supported, the maximum MUST be adjusted to be smaller than or
      equal to the maximum PDU.  Multiple messages can be used if there
      is more data than will fit in a single TLV.

   Traffic Classification Identifier (TID):
      A 16-bit unsigned integer identifying a traffic classification
      set.  There is no restriction on values used by a modem, and there
      is no requirement for sequential or ordered values.

   Num SDIs:
      An 8-bit unsigned integer indicating the number of Traffic
      Classification Sub-Data Items included in the Data Item.  A value
      of zero (0) is allowed and indicates that no traffic should be
      matched against this TID.

   Reserved:
      For the Traffic Classification Data Item, this reserved field is
      currently unused.  It MUST be set to all zeros for this version of
      the Data Item and is currently ignored on reception.  This allows
      for future extensions of the Data Item if needed.

   Traffic Classification Sub-Data Item:
      Zero or more Traffic Classification Sub-Data Items of the format
      defined in Section 2.1.1 MAY be included.  The number MUST match
      the value carried in the Num SDIs field.

   A router receiving the Traffic Classification Data Item MUST locate
   the traffic classification information that is associated with the
   TID indicated in each received Data Item.  If no associated traffic
   classification information is found, the router MUST initialize a new
   information set using the values carried in the Data Item.  If the
   associated traffic classification information is found, the router
   MUST replace the corresponding information using the values carried
   in the Data Item.  In both cases, a router MUST also ensure that any
   data plane state (e.g., see [RFC9893]) that is associated with the
   TID is updated as needed.
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