Using an IP DSCP classification policy and a dot1p classification policy is another method used to assign the FC and profile on SAP ingress for use with color-aware meters. Similar to network ingress, you can use an IP DSCP classification policy and a dot1p classification policy to assign the FC and profile on SAP ingress for use with color-aware meters. In this section, this classification is also called table-based classification. Table-based classification is supported on the 7210 SAS-Mxp both in low-sap-scale mode and high-sap-scale mode. Table-based classification and CAM-based classification are mutually exclusive.
This is supported along with the capability to use other header fields in MAC and IP packets through the use of the mac-criteria, ipv4-criteria, and ipv6-criteria commands. When using SAP-ingress color-aware meters and policers, users can configure DEI to assign the initial profile on ingress and can configure either MAC criteria or IP criteria (or both) to assign the FC.
To configure IP DSCP classification, users create a DSCP classification policy, associate the policy with a SAP ingress QoS policy or an Ethernet ingress port or L3 interface (as applicable), apply the SAP ingress QoS policy to the SAP or port, and enable the use of the policy.
Similarly, to configure dot1p classification, users create a dot1p classification policy, associate the policy with a SAP ingress QoS policy or an Ethernet ingress port, apply the SAP ingress QoS policy to the SAP or port, and enable the use of the policy.
DSCP and dot1p classification use classification resources from a table classifier and, potentially, a lesser number of resources from the CAM resources, thereby saving CAM resources for other purposes. When a table-based classification policy is enabled, CAM-based classifications from the SAP ingress QoS policy are ignored.
The following topics describe the support for FC and profile assignment based on IP DSCP and dot1p on SAP ingress.