CAT3850 Validate QoS Setting

[Heriberto Diaz]

Hi

 Does anybody know what command can I use to validate the QoS Setting on Cat3850? Because on IOS Cat2960X I can use the command "show mls qos".

I need to check if the 3850 have enable or disable the Rewrite DSCP.

Thanks and regards. 

[Giuseppe Larosa · Accepted solution]

Hello Heriberto,

Cat3850 used modular QoS like software based routers.

So you need to check if a policy map is applied to an interface with

show policy-map interfave gix/y

see the following link

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/qos/configuration_guide/b_qos_3se_3850_cg/b_qos_3se_3850_cg_chapter_011.html#concept_1B88D96BE633433893CBB45C29EAC6BE

and the trust device command in interface mode can be used to trust DSCP or CoS bits but they need to be present in incoming frames

>>The trust device device_type command available in interface configuration mode is a stand-alone command on the switch. When using this command in an AutoQoS configuration, if the connected peer device is not a corresponding device (defined as a device matching your trust policy), both CoS and DSCP values are set to "0" and any input policy will not take effect. If the connected peer device is a corresponding device, input policy will take effect.

Hope to hep

Giuseppe

[Georg Pauwen]

Hello,

the 3850 runs MQC as opposed to the older MLS. Check the link below for a comparison and the command equivalents:

https://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/118629-technote-qos-00.html