On access SAP-ingress, the user has an option to use either dot1p classification, IPv4 DSCP classification, IPv4 packet header fields, IPv6 packet header fields, or MAC packet header fields. The dot1p or DSCP classification rules to be used are defined in the dot1p and DSCP classification policy and associated with the SAP-ingress policy. The DSCP and dot1p classification policies can be configured in the same QoS policy. The IPv4 or IPv6 or MAC criteria can be configured in the SAP-ingress policy.
When packets are received on an access SAP, the following steps are used to determine the FC to assign to the packet.
Match IP criteria entries with the IP packet header fields in the packet. Assign the FC corresponding to the first entry which matches with IP packet header field values in the packet. If it is not an IP packet or if there is no match, go to next step.
Match MAC criteria entries with the MAC packet header fields in the packet. Assign the FC corresponding to the first entry which matches with MAC packet header field values in the packet. If there is no match, go to next step.
Match the IP DSCP value in the packet with the value configured in each of the IP DSCP entry defined in the DSCP classification policy. Assign the FC corresponding to the first entry which matches with IP DSCP value in the packet. If it is not an IP packet or if there is no match, go to next step.
Match the dot1p value in the packet (if available) with the value configured in each of the dot1p entry defined in the dot1p classification policy. Assign the FC corresponding to the first entry which matches with dot1p value in the packet. If there is no match, go to next step.
Assign the default FC.