How to understand the service policy configuration of N6000？

[xiaoT]

Customers need to update and replace the core switch at present, but for N6000 switch is not familiar with some configuration, please consult you, thank you.

The order is as follows:

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1、class-map type qos match-any VOICE
      match dscp 46
2、class-map type queuing queueVOICE
      match qos-group 5
3、policy-map type qos Global-Classification
      class VOICE
      set qos-group 5
4、policy-map type queuing Global-Queuing
     class type queuing queueVOICE
     priority
5、class-map type network-qos nqVOICE
      match qos-group 5
6、policy-map type network-qos Global-Network-QoS
     class type network-qos nqVOICE
     queue-limit 20480 bytes
     class type network-qos class-default
7、system qos
     service-policy type qos input Global-Classification
     service-policy type network-qos Global-Network-QoS
     service-policy type queuing output Global-Queuing
     service-policy type queuing input Global-Queuing

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Second: what does match QoS group 5 mean？

Sixth: is it to match QoS group 5, that is, 20480 bytes?

Item 7: do you want to call QoS policy columns globally?

thank！

[Giuseppe Larosa]

Hello XiaoT,

qos-groups are an old QoS concept that is not propagated out of the node but it can be used inside it as a way to create an out of packet marking. The Qos group number is just a label and number 5 here is used to remember IP precedence 5 that was used for VOPI packets in IP PREC based QoS.

In your configuration for examples packets matching DSCP 46  or EF are marked wih qos group 5 by the Global classification input policy

The outgoing queue policy match on qos group 5 and puts them in a LLQ priority queue

class type queuing queueVOICE
priority

Likely the queueing service policy cannot use class-maps that match directly on DSCP on this platform and this is the reason for this configuration.

Hope to help

Giuseppe

[xiaoT]

Thank you very much。