CAM resource usage for IP DSCP and dot1p classification policies on the 7210 SAS-Mxp, 7210 SAS-R6, and 7210 SAS-R12

The resources for IP DSCP and dot1p classification policies are taken from hardware tables, which is referred to as table-based classification to differentiate it from CAM-based classification. Table-based resources do not use many CAM entries for classification. Only a fixed number of CAM resources is needed to match the FC and traffic type and to assign a meter/policer. Table-based classification uses CAM resources more efficiently than CAM-based classification:

• Users can enable an IP DSCP and dot1p classification policy on a per-SAP or per-port basis. See Associating a DSCP or dot1p classification policy.

• The rules for associating an IP DSCP and dot1p classification policy with SAPs for different services are different. See Assigning and enabling DSCP and dot1p classification policies to a SAP.

To calculate the number of resources needed, see the following sections:

• Computation of resources used per SAP ingress policy for CAM-based classification

• Examples: calculating resources required for CAM-based classification

• Examples: calculating resources required for IP DSCP table-based classification with CAM-based policing (7210 SAS-Mxp, 7210 SAS-R6, and 7210 SAS-R12)