This read-write object holds the new priority value written into the outer tag's priority bits on egress, and only takes effect when cmEgressOuterTagCtrl is set to SWAP. An administrator configures this specific value to determine exactly what priority marking replaces the original one during the swap operation. For example, setting this to a specific priority value alongside enabling SWAP mode ensures every egress frame's outer tag priority is deliberately overwritten to that value rather than left at whatever it was on ingress.