2.1. Data Plane Considerations

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Original RFC Text

2.1.  Data Plane Considerations

   When credit windowing is used, a router MUST NOT send data traffic to
   a modem for forwarding if there is no matching classifier.  If a
   matching classifier is found, a router MUST NOT send data traffic to
   a modem when there are no credits available in the associated credit
   window.  Section 2 describes how classifiers are associated with
   destinations and how credit windows are associated with classifiers.
   Additionally, a router MUST ensure that sufficient credits are
   available in the associated credit window for the current data packet
   before sending that data packet to the modem.  The count of octets in
   the packet includes MAC overhead.  Taking Ethernet as an example,
   framing, header, and trailer are all included in this count.  This
   document defines credit windows in octets, and the credit window is
   decremented by the number of sent octets.

   A router MUST identify the credit window associated with traffic to
   be sent to a modem based on the traffic classification information
   provided in the Data Items defined in this document.