Remarking Packet Priority at Ingress
Apart from altering the internal priority and drop precedence, Qumran device allows modification of packet priority for PCP and DSCP values by one of the following methods:
• Configuration of ingress dscp-to-queue mapping profile allows the modification of DSCP value of the packet. This mapping is applicable only to IPv4 traffic on router port.
• QoS policy-maps can be configured with set CoS and set DSCP actions which will modify PCP or DSCP value of the packet, respectively. Set CoS action is applicable on switch ports and tagged packets. Set DSCP action is applicable on router port where IPv4 traffic is received on the port. Remarking DSCP through policy-map configuration will override the mapping profile remarking.
Note: Qumran does not support encoding EXP value from packet priority of tagged (PCP) or IPv4 traffic (DSCP) through ingress processing. EXP value encoding is supported only through egress processing.