QoS

Egress queues are attached to the port that is used by a Flex PW port to forward traffic (a Flex PW port is bound to one of the ports in the PW port list). In similar fashion, if an egress port scheduler is used, it is attached to the same port. However, the egress port schedulers must be associated by configuration with every port in the PW port list while egress queues are instantiated only on a single port. During a port switchover, egress queues are recreated on the new port and while this is occurring, the failover queue is used to forward traffic. Each port has a single egress failover queue that is used to forward traffic while SAP or subscriber queues are being recreated during transitioning events.

On the other hand, egress port scheduler must be configured by the operator in advance on each port in the PW port list so that it can be ready to treat traffic immediately after its children queues are recreated on this port.

Policers are used on ingress and they do not need to be recreated during port switchover. Instead, they are re-mapped to a new port.

An example QoS configuration is provided below:

1. Egress port scheduler definition

      
      port-scheduler-policy ‟flex" create
          max-rate 1000000
          group "test" create
          exit
          level 1 rate 100000
      exit
   

2. Association between the egress port scheduler and ports

      
      configure  port 1/1/1 
          ethernet
             mode hybrid
             encap-type qinq
             egress-scheduler-policy ‟flex"
          exit
      no shutdown
      configure  port 1/1/2 
          ethernet
             mode hybrid
             encap-type qinq
             egress-scheduler-policy ‟flex"
          exit
      no shutdown
   

3. Association between subscriber queues or policers and the egress port scheduler

      
      configure  qos sap-egress 2 
          queue 1 create
             port-parent level 1
             rate 10000
          exit
          queue 2 create 
             port-parent level 1
             rate 10000
          exit
          queue 3 create
             port-parent level 2
             rate 1000
          exit
   

4. Applying queue policy to an object:

   • Subscriber management

        
        configure  subscriber-mgmt sla-profile "sla-profile-1"  
            egress 
               qos 2  
            exit 
     

   • PW SAP in a Layer 2 service

        
        configure  service epipe 10
            sap pw-1:1.2
               egress
               qos 2
            exit
     

   • PW SAP in a Layer 3 service

        
        configure  service vprn 11
            interface ‛flex-int’
               address 1.1.1.1/24
               sap pw-1:1.3
                  egress
                     qos 2
                  exit
            exit
        exit