This section provides examples for calculating the amount of resources needed for a service ingress policy when CAM-based classification is used. For calculations when IP DSCP table-based classification is used, see Examples: calculating resources required for IP DSCP table-based classification with CAM-based policing (7210 SAS-Mxp, 7210 SAS-R6, and 7210 SAS-R12).
The resource calculation shown for VLL is also applicable for VPRN services.
The examples in this section use the two equations below to calculate the value for num-qos-classifiers used in the sap-ingress QoS policy. See Computation of resources used per SAP ingress policy for CAM-based classification for more information about these equations.
total number of classification entries (TC)
where:
E(i) is the number of match-criteria entries that classify packets to FCi
C(i) is the number of classification entries that are required by FCi to identify different traffic types
total number of QoS resources required (TQ)
where:
TP is the number of meters/policers used
In addition, the examples show how to determine the number of classification entries for each forwarding class. For example, FCh2 (shown below) is the sum of four traffic types: (unicast (U), broadcast (B), multicast (M), and unknown-unicast (U-u)). See Calculating the number of classification entries per FC for more information.
If BUM entries are not explicit and multipoint traffic is expected, meter "11" is used and the "M" traffic type is given a "1".