Virtual and non-virtual channel

Example: Sub-ring using virtual-link configuration output on Node C, interconnecting node

eth-ring 2
        description "Ethernet Sub Ring on Ring 1"
            interconnect ring-id 1 // Link to Major Ring 1
                propagate-topology-change 
            exit
        exit
        path a 1/1/3 raps-tag 100 // Ring control uses VID 100
            eth-cfm
                mep 9 domain 1 association 4
                    ccm-enable
                    control-mep
                    no shutdown
                exit
            exit
            no shutdown
        exit
        no shutdown
  exit 

sub-ring non-virtual-link // Not using a virtual link

# Control Channel for the Major Ring ERP1 illustrates that Major ring 
# control is still separate from Sub-ring control
  vpls 10 customer 1 create
      description "Control VID 10 for Ring 1 Major Ring"
      stp shutdown
      sap 1/1/1:10 eth-ring 1 create
          stp shutdown
          exit
      sap 1/1/4:10 eth-ring 1 create
          stp shutdown 
          exit
      no shutdown
  exit 



# Data configuration for the Sub-Ring

  vpls 11 customer 1 create
      description "Data on VID 11 for Ring 1"
      stp shutdown 
      sap 1/1/1:11 eth-ring 1 create // VID 11 used for ring
          stp shutdown 
      exit
      sap 1/1/4:11 eth-ring 1 create
          stp shutdown 
      exit
      sap 1/1/3:11 eth-ring 2 create // Sub-ring data
          stp shutdown 
      exit
      sap 3/2/1:1 create 
      description "Local Data SAP"
          stp shutdown 
      no shutdown
  exit

# Control Channel for the Sub-Ring using a virtual link. This is 
# a data channel as far as Ring 1 configuration. Other Ring 1 
# nodes also need this VID to be configured. 

  vpls 100 customer 1 create
      description "Control VID 100 for Ring 2 Interconnection"
      split-horizon-group "s1" create //Ring Split horizon Group
      exit
      stp shutdown 
      sap 1/1/1:100 split-horizon-group "s1" eth-ring 1 create
          stp shutdown 
      exit
      sap 1/1/4:100 split-horizon-group "s1" eth-ring 1 create
          stp shutdown 
      exit
      sap 1/1/3:100 eth-ring 2 create
          stp shutdown 
      exit
      no shutdown
  exit 

Example