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New Member

Nexus 5596 QoS for Cisco Phones

Hello,

I am deploying a pair of Nexus 5596's with 3750 POE switches in the closets.  I'm looking for a best practice as how to configure the Nexus 5596 to support proper QoS for EF at the core. 

If there is a good doc on how to explain this, that would be great.  All the docs I find are just the command reference and not how it needs to be confgiured in this senario.

Thanks. 

Everyone's tags (2)
6 REPLIES
Cisco Employee

Nexus 5596 QoS for Cisco Phones

Hi

I'd suggest you to read config guide first - to understand principles of QOS on n5k platform - since it differs from other devices.

Here is the giude:

http://www.cisco.com/en/US/docs/switches/datacenter/nexus5000/sw/qos/Cisco_Nexus_5000_Series_NX-OS_Quality_of_Service_Configuration_Guide_chapter3.html

And then you can read practical example, which may be heplful in your case:

http://www.netcraftsmen.net/resources/blogs/qos-on-the-nexus-5000-2000-part-1.html

HTH,

Alex

New Member

Nexus 5596 QoS for Cisco Phones

Hello, thanks for the reply, those article were very helpful.

I've come up with a configuration on my core 5548's so that it should prioritze voice traffic / EF on every port and give voice 30% of the bandwidth.  This policy is to ensure that any voice traffice traversing from the access layer 3750's through the Nexus will always be priortized.


class-map type qos match-any VOICE
  match dscp 46
  match cos 5

class-map type queuing QUEUING-COS5
  match qos-group 5

policy-map type qos VOICE-IN
  class VOICE
    set qos-group 5
  class class-default
    set qos-group 0

policy-map type queuing QUEUING-GLOBAL
  class type queuing QUEUING-COS5
    priority
    bandwidth percent 30
  class type queuing class-fcoe
    bandwidth percent 0
  class type queuing class-default
    bandwidth percent 70


system qos
  service-policy type qos input VOICE-IN
  service-policy type queuing output QUEUING-GLOBAL

Would you change anything?  Thanks for the help. 

Cisco Employee

Nexus 5596 QoS for Cisco Phones

Hi

It hink they're quite good.

Matching traffic -> sending to qos-group -> applying queuing policy on exit.

you can easily modify them according to your network needs.

Cheers,

Alex

New Member

Nexus 5596 QoS for Cisco Phones

Great, thanks for the help.

New Member

Nexus 5596 QoS for Cisco Phones

On last question, how do I enable qos statistics for a policy map?  I have enabled it globally.  Thanks:

NEX1# show policy-map interface e1/1


Global statistics status :   enabled

Ethernet1/1

  Service-policy (qos) input:   VOICE-IN
   policy statistics status:   disabled

    Class-map (qos):   VOICE (match-any)
      Match: dscp 46
      Match: cos 5
      set qos-group 5

    Class-map (qos):   class-default (match-any)
      Match: any
      set qos-group 0

Cisco Employee

Nexus 5596 QoS for Cisco Phones

Use "show queuing interface eth x/y" instead.

"show policy map interface ..." is not supported in the current nx-os releases.

HTH,

Alex

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