To achieve QoS Egress marking/queuing, the Cisco NCS 4000 Series Routers utilize the dual policy model on egress with independent policies for marking and queuing.

Egress marking can be achieved by applying a policy-map on the ingress interface. Similarly, egress queuing can be achieved by applying a policy-map on the ingress interface by setting the traffic-class. Then the traffic-class is used by the egress-policy map to perform queuing actions.

Cisco NCS 4000 Series router supports dual policies on a single interface (egress only).

QoS Egress Marking and Queueing is summarised as below:

• Configure an ingress policy-map

  Create a class-map
  Router#config
  Router(config)#class-map match-any cos2
  Router(config-cmap)#match cos 2
  Router(config-cmap)#commit
  Router(config)#class-map match-any cos3
  Router(config-cmap)#match cos 3
  Router(config-cmap)#commit
  Router(config)#class-map match-any cos4
  Router(config-cmap)#match cos 4
  Router(config-cmap)#commit
  
  Create classification policies
  Router#config
  Router(config)#policy-map ingress-classification 
  Route(config-pmap)#class cos 2 
  Router(config-pmap-c)#set qos-group 1
  Router(config-pmap-c)#set traffic-class 3
  Router(config-pmap-c)#class cos3
  Router(config-pmap-c)#set qos-group 2
  Router(config-pmap-c)#set traffic-class 5
  Router(config-pmap-c)#class cos4
  Router(config-pmap-c)#set qos-group 3
  Router(config-pmap-c)#set traffic-class 4
  Router(config-pmap-c)#class class-default
  Router(config-pmap-c)#set qos-group 7
  Router(config-pmap-c)#set traffic-class 6
  Router(config-pmap-c)#commit

• Configure an egress policy-map

  Create egress marking policy
  Router#config
  Router(config)#class-map match-any qos1
  Router(config-cmap)#match qos-group 1 
  Router(config-cmap)#commit
  Router(config)#class-map match-any qos2
  Router(config-cmap)#match qos-group 2 
  Router(config-cmap)#commit
  Router(config)#class-map match-any qos3
  Router(config-cmap)#match qos-group 3 
  Router(config-cmap)#commit
  Router#config
  Router(config)#policy-map egress-marking
  Route(config-pmap)#class qos1
  Router(config-pmap-c)#set cos 1
  Router(config-pmap-c)#class qos2
  Router(config-pmap-c)#set cos 2
  Router(config-pmap-c)#set dei 1
  Router(config-pmap-c)#class qos3
  Router(config-pmap-c)#set cos 3
  Router(config-pmap-c)#class class-default
  Router(config-pmap-c)#set cos 7
  Router(config-pmap-c)#commit
  
  Create Egress queueing policy
  Router#config
  Router(config)#class-map match-any tc3   
  Router(config-cmap)#match traffic-class 3   
  Router(config-cmap)#commit
  Router(config)#class-map match-any tc4
  Router(config-cmap)#match traffic-class 3   
  Router(config-cmap)#commit
  Router(config)#class-map match-any tc5
  Router(config-cmap)#match traffic-class 3   
  Router(config-cmap)#commit
  Router#config
  Router(config)#policy-map egress-queuing
  Route(config-pmap)#class tc3
  Router(config-pmap-c)#shape average 2 mbps
  Router(config-pmap-c)#class tc4
  Router(config-pmap-c)#shape average 5 mbps
  Router(config-pmap-c)#class tc5 
  Router(config-pmap-c)#shape average 7 mbps
  Router(config-pmap-c)#class class-default
  Router(config-pmap-c)#commit

• Attach the policies to an interface

  
  Router#config
  Router(config)#interface tenGigE 0/0/1/0/0 
  Router(config-if)#service-policy input ingress-classification 
  Router(config-if)#service-policy output egress-marking 
  Router(config-if)#service-policy output egress-queuing  
  Router(config-if)#commit