DSCP marking on Nexus 5000

[adery6300]

Hello,

I'm trying to convert our existing QoS template that we use on our 3750/3560 to work on our new Nexus 5000 switches.

The ACLs and class-maps are ok, but it seems I can't do a "set dscp xx" within the policy-map on the Nexus 5000, like I was able to using the 3750/3560.

This is what I normally configure on a 3560/3750 :

policy-map QosPolicy

class VoIP

  set dscp ef

exit

class CriticalApp

  set dscp af31

exit

[...]

class class-default

  set dscp default

exit

exit

The "set dscp xyz" command isn't available on my Nexus 5000s. I'm running NX-OS version 4.1(3)N1(1)... I'm currently unable to download version N2 from Cisco (some cryptic error about mismatched data), so I can't verify whether "set dscp" is available there in the newer version.

Have I misunderstood something about the QoS on Nexus 5000s ?

Please advise,

Alex.

[Jon Marshall · Accepted solution]

Alex

I don't know about v4.2 but as far as i know for the Nexus 5000 switches you only have the option to set CoS values. Only the L3 capable Nexus 7000 has the capability of setting DSCP values.

Jon

[adery6300]

This is not the answer I was looking for, but the datasheet of the Nexus 5000 does indeed only mention "MQC CoS Marking" in the QoS subsection ( see http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/data_sheet_c78-461802.html ).

It's a shame though... 3560s with IP Base (L2) are able to do DSCP marking just fine... sigh...

Thanks Jon!