The 6608 and 6624 internal port is treated as trust-cos to the Catalyst 6000. So the default COS-to-DSCP mapping of the cards will determine the DSCP values with which the IP packets are marked unless they are changed in the switch.
The 6608 and 6624 will tag packets as follows:
COS = 5 for rtp traffic
COS = 3 for signalling traffic
By default on the Catalyst 6000, these COS values map in IP packets to DSCP 24 (COS = 3) and 40 (COS = 5) as shown in the table below.
Generally, the recommended DSCP values to use in a VoIP network differ slightly. They are:
It may be necessary to change the default COS-DSCP mapping on the Catalyst 6000 so that the DSCP markings in packets generated by the 6608 and 6624 cards conform to the network policy. For example, if other devices in the network are marking packets with the recommended values.
Information on how to change the default COS-DSCP mapping is provided in the Mapping Received CoS Values to Internal DSCP Values section of Catalyst 6000 Family Software Configuration Guide.
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