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Beginner

CAT3850 Validate QoS Setting

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. 

 

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Hall of Fame Master

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

 

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2 REPLIES 2
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Hall of Fame Master

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

 

View solution in original post

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VIP Mentor

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

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