On MPLS based on 7500 routers, want to configure WRED on MPLS trunks. In each class I should configure the random-detect command, that can be based on IP Precedence or DSCP. My question is if the random detect shouldn´t be based on EXP bit value, like matches on class maps for MPLS links are based on EXP instead of Ip Prec or DSCP, because on DSCP links we see only the label. So, to configure WRED on MPLS trunks, does it look inside each IP packet, and it is it based on IP Prec or DSPC, or is there any way to configure WRED based on EXP value? What is the recomended configuration? Also, if possible, are there default values with lower-drop probabilities for higher priority classes?
I've read from QoS for IP/MPLS by Santiago Alvarez. It says that
"Notice that the WRED implementation will use the MPLS EXP markings for MPLS packets when you configure WRED to use IP precedence or DSCP as the weighting field. Table 3-26 summarizes the weighting fields that can control the operation of WRED."
Is this correct? so the command "random-detect dscp-based" will actually use MPLS EXP for deciding the drop preference?
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