QoS LAN - how to say switchport reassign CoS value to mixt?

Hi all

There is an order issued on the switchport which tells a Cisco IP Phone trust the CoS of a station connected to the access of the phone port said, but to change the tag to a CoS value of your choice. Example:

MSL qos trust cos

switchport priority extend cos 3

I have, however, is a resort with important data traffic only able to send traffic on CoS 0 and no voice/phone.

So I want to load the switchport to assign a CoS value of 3 for traffic from the stand-alone PC station.

Y at - it an IOS command that makes this possible without going through a Cisco IP Phone between the port and the PC Station?

Hi Dean,

Specifically, if the mls qos cos 3 command is ineffective for IP packets  and the port is configured to trust dscp, then how would an  administrator set the desired DSCP priority level for those packets  he/she wants?

What you're asking here contradicts itself. Trust the DSCP means "the DSCP value is good and requires no rewriting"-why would you want to override the DSCP value, then?

Note that even for the mls qos trust cos, the mls qos cos command applies only to those executives who no CoS present on the ground because the 802. 1 q VLAN tag is missing. If the frame has a CoS field, the mls qos cos command does not apply. With qos trust dscp mls, a similar mls qos dscp command makes no sense: each IP packet has a DSCP field in its header, and non - IP packets have no DSCP whatsoever.

However, there is a way to actually classify and possibly rewrite the DSCP values in a more precise way by using the class- and policy-cards used in the command of the service-policy interface. This command can be used instead of mls qos trust command and perform more thorough, more elaborate classify and re-writing of DSCP value. See:

http://www.Cisco.com/en/us/docs/switches/LAN/catalyst3560/software/release/15.0_2_se/command/reference/cli2.html#wp6193114

Best regards

Peter

Tags: Cisco Network

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