I am new to QoS, have read quite a lot od documents but not sure how to implement it properly. I have a setup where Polycom video terminals for video conferencing are connecting to a Catalyst 4000 switch with a Sup1 engine (Layer2 support only). I have upgraded the CAT OS to the latest version. The Polycom units can mark packets with an IP precedence value. I have enabled QoS on the switch. Is there a way I can tell the switch to trust the Polycom marking. Do I need to map COS to IP PREC? I don't see a command on the switch with the SUP1 engine to do this. Is there anything else I would need for QoS on this switch? This traffic would be forwarded to CAT6000 with a SUP2 engine but I can't connect the Polycom to the 6509 because of distance limitations. If the packets are marked with a COS value on the 4000 switch would a cos to ip prec mapping be all that is needed on the 6000. Any suggestions?
I am not familar with the Sup I for the Cat 4 but I would think if it did not support QOS it would still foward this. I suggest you put a sniffer on the other side of the Cat 4 and see what it shows on the TOS byte.
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