Trying to mark QOS on VLAN traffic on Nexus 7K

[Sabic Network Team]

I need to mark the traffic for a server with AF31. The server is not capable of marking the traffic on its own. The gateway device is configured on Nexus 7K switch. I am trying to mark the traffic from that server on Gateway using following configuration.

I am trying all the traffic coming from that server VLAN to AF31.

class-map match-any classvcs
  match dscp 0

policy-map type qos policyvcs
  class classvcs
    set dscp 26
  class class-default

vlan configuration 81
  service-policy type qos input policyvcs

I ran the Wireshark Capture for communication from server to my machine. I guess it should mark the traffic but its not happening.

Any suggestions on configuration if I am doing it correct or wrong?

[Reza Sharifi · Accepted solution]

By default, Nexus platforms preserve and trust the QOS marking, but the marking has to be done from the application/server side.

HTH

[Sabic Network Team]

Hi Reza,

Thanks for the update. 

This is exactly I am looking for. The traffic is not marked by application here. I need to mark it on nearest Layer 3 device which is Nexus in this case.

Hence if I need to do that, is the configuration mentioned in the my initial post correct ?

[Reza Sharifi · Accepted solution]

Hi,

I am not sure if that is possible, because by the time the traffic is received on that interface by the switch there is no marking to preserve.

HTH