2.3.1. Router Receive Processing

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Original RFC Text

2.3.1.  Router Receive Processing

   A router receiving the Traffic Classification Sub-Data Item MUST
   validate the information on receipt, prior to using the carried
   information, including potentially updating the data behavior as
   determined by the extension requiring the use of the Sub-Data Item.
   Note that validation can include usage-specific semantics such as
   those found in [RFC9893].  Any failures MUST be treated as an error
   as described in Section 2.1.1.

   After successful validation, the receiver MUST ensure that each
   Priority Field value is listed only once across the whole Traffic
   Classification Data Item.  Note that this check is across the Data
   Item and not the individual Sub-Data Items.  If the same Priority
   Field value is listed more than once within the same Traffic
   Classification Data Item, the Data Item MUST be treated as an error
   as described in Section 2.1.1.

   In cases where both Traffic Classification Sub-Data Item Types are
   defined, matching on Ethernet information takes precedence.  More
   specifically, when a packet matches both a DSCP indicated in a
   Diffserv Traffic Classification Sub-Data Item (Section 2.2) and a
   VID/PCP identified in an Ethernet Traffic Classification Sub-Data
   Item (Section 2.3), the TID associated with the matching VLAN/PCP
   MUST be used.