cos and DSCP on a switch .. both need to be used ?

[parisdooz12]

Hi,

I am begining to work to apply Qos on switchs (C2960 & C6500), and I still have a doubt about the necessity to consider the cos value. I indeed want to apply Qos for ToIP, Video, perhaps create a scavenger class, ans in all cases, I classify my packets with TCP/UDPB port and mark them with DSCP. So is it really necessary to study all the DSCP/CoS mapping problematics ? Is it not possible to make the configurations only on the base of the DSCP field?

Thanks by advance for your help.

D.

[andrew.prince · Accepted solution]

yes you do, as the last time I looked at QoS. A 6500, it only supports CoS so you need to understand the mapping tables for the relative queuing options.

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[parisdooz12]

Hi Andrew,

Thanks for your answer. You're (unfortunatelly) right. The exception seems to be 6708-10GE cards which are able to map cos or DSCP.

Hoping Cisco is going to ease the Qos implementation in the future! ;-)

[andrew.prince]

Hey I know it can frustrating sometimes, but what can you do!!!

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