Could someone clarify this for me please.
If I send a packet from a CE to PE with DSCP EF marked my understanding is by default the top 3 bits are copied to the MPLS EXP bits.
So the packet now has a label(s) with EXP value 5 and an internal IP packet with DSCP EF.
Assuming nothing changes the label value as it crosses the MPLS cloud at the EGRESS will the IP packet have the EXP bits imposed on it ? Thus changing the DSCP value EF to cs5/IP Prec 5 ? Or will the EXP bits be copied into the ToS byte top 3 bits only leaving the others unchanged ? This then causing the IP packet to emerge with its original EF marking ?
Or have I completely misunderstood this ?