Thank you for asking this question in the support community. I will try to answer your questions as best as I can. Also, please review this guide for additional information about Ethernet Switch QoS Configuration.
CoS values can be determined based on the packet’s DSCP value (if DSCP-to-CoS mapping is enabled using the qos dscp-cos command). If DSCP-to-CoS mapping is enabled, CoS values are altered when specified DSCP values are detected on inbound traffic. On most of the switching platforms DSCP-to-CoS mapping is disabled by default. However, when DSCP-to-CoS mapping is enabled, then by default the mapping is shown in the table below:
DSCP 0 8 16 24 32 40 48 56 CoS 0 1 2 3 4 5 6 7
If you want DSCP 46 to be mapped to a CoS of 5, then you will need the following commands:
(config)# qos dscp-cos
(config)# qos dscp-cos 46 to 5
When the CoS is tagged with a value of 5, that value will be retained throughout the switching network--as long as the other switches are configured to trust CoS values.
I hope that makes sense, but please do not hesitate to reply with any additional questions or information. I will be happy to help in any way I can.
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