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Oct 13

MLS QoS On Cisco Switches

MLS QoS is disabled by default on a 6500 series switch which means that any packeting entering or leaving the switch is not remarked or changed for DSCP values. To check if the QoS is enabled or not use following command

6509# sh mls qos

It will show if MLS QoS is enabled or not. However, if it is enabled then it only trust the marking on ports which are configured with 'mls qos trust dscp' command and will rewrite DSCP value to 0 which is not configured with trust command. So to place a port in trust status such that any packet received on that port should remain the same use following command

6509# mls qos trust dscp

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