Egress QoS Mutation

The QoS operation on egress traffic involves marking packets as they leave the chip on the egress port. As the packets are prepared to exit the device you can set the PCP/CoS and DSCP values in the packet headers.

802.1P priority mapping (traffic class-to-PCP mutation)

The internal traffic class can be mapped to the outgoing PCP value when the packet egresses the switch. You can create a priority mapping table using a CoS mutation map. This CoS mutation map can then be applied to an egress interface to effect the priority re-mapping. This feature only maps the internal traffic class to outgoing priority.

DSCP remarking

This feature allows the user to remark the DSCP value of the egressing IP packet using the ingress DSCP value. The configuration must be bound to an egress interface.

DSCP-to-CoS mutation mapping

The ingress DSCP value can be mapped to outgoing 802.1P values by configuring a DSCP-to-CoS mutation map on the egress interface.