BA and Fixed Classification on 10-port 10-Gigabit Oversubscribed Ethernet PICs Overview

The 10-port 10-Gigabit OSE PICs support the following behavior aggregate (BA) classifiers:

• DSCP, DSCP IPv6, or IP precedence—IP packet classification (Layer 3 headers)
• MPLS EXP—MPLS packet classification (Layer 2 headers)
• IEEE 802.1p—Packet classification (Layer 2 headers)
• IEEE 802.1ad—Packet classification for IEEE 802.1ad formats (including DEI bit)

Multiple classifiers can be configured to a single logical interface. However, there are some restrictions on which the classifiers can coexist. For example, the DSCP and IP precedence classifiers cannot be configured on the same logical interface. The DSCP and IP precedence classifiers can coexist with the DSCP IPv6 classifier on the same logical interface. An IEEE 802.1 classifier can coexist with other classifiers and is applicable only if a packet does not match any of the configured classifiers. For information about the supported combinations, see Applying Classifiers to Logical Interfaces.

If the classifiers are not defined explicitly, then the default classifiers are applied as follows:

• All MPLS packets are classified using the MPLS (EXP) classifier. If there is no explicit MPLS (EXP) classifier, then the default MPLS (EXP) classifier is applied.
• All IPv4 packets are classified using the IP precedence and DSCP classifiers. If there is no explicit IP precedence and DSCP classifiers, then the default IP precedence classifier is applied.
• All IPv6 packets are classified using DSCP IPv6 classifier. If there is no explicit DSCP IPv6 classifier, then the default DSCP IPv6 classifier is applied.
• If the IEEE 802.1p classifier is configured and a packet does not match any explicitly configured classifier, then the IEEE 802.1p classifier is applied.

The fixed classification matches the traffic on a logical interface level. The following example classifies all traffic on logical unit zero to the queue corresponding to assured forwarding.

Note: The 10-port 10-Gigabit OSE PICs do not support multifield classification. However, the multifield classification can be done at the Packet Forwarding Engine using the firewall filters, which overrides the classification done at the PIC level. The multifield classification at the Packet Forwarding Engine occurs after the PIC handles the oversubscribed traffic.