I have sup 720 pfc3 based 7600 with WS6XXXX Lan cards. Say we have 'mls qos' & 'mls qos trust ip prec'. The ingress & egress port are mpls enabled. There is a concept of 'internal DSCP value' in this platform. I have two questions
1. For traffic with 802.1P Ethernet frame & normal ipv4 with IP Prec , the internal DSCP mapped value is easy to understand, so on Egress side same DSCP value will be used.
2. For Labeled Ethernet frame ( without .1P ) , how the internal DSCP value is mapped, and how can this internal DSCP value rewrite EXP value on Egress.
how would exp value have an impact on QOS treatments..