tSapIngressDSCPFC specifies the forwarding class or the sub
forwarding class to be used to classify all the traffic that
matches the specific DSCP i.e. tSapIngressDSCP.
Specification of a sub forwarding class is also allowed. The
format of a sub forwarding class is the concatenation of the
base forwarding class and a sub class identifier in the form
base-fc-name[.sub-fc-name]
To reference a sub forwarding class, the mapping of the sub
forwarding class should be existing in this QoS policy.
Unless tSapIngressDSCPFC is specified explicitly, this match
will be ignored for classification purposes.