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# Configuring Service Fragments for an Aggregate Service (SRC CLI)

Use the following configuration statements to configure an aggregate service in the global service scope:

`

services global service name aggregate fragment name {
  expression expression ;
  service service ;
  mandatory;
  redundancy-group redundancy-group ;
  subscription-required;
  substitution [ substitution... ];
}

`

Use the following configuration statements to configure an aggregate service in a service scope:

`

services scope name service name aggregate fragment name {
  expression expression ;
  service service ;
  mandatory;
  redundancy-group redundancy-group ;
  subscription-required;
  substitution [ substitution... ];
}

`

To configure service fragments for an aggregate service:

1. From configuration mode, enter the service aggregate configuration. In this sample procedure, the service called MirrorAggregate is configured in the scope configuration.
   `
   user@host# edit services scope TM service MirrorAggregate aggregate fragment 0
   `
2. Configure the subscriber reference expression that identifies the remote subscriber session that will host the fragment.
   `
   [edit services scope TM service MirrorAggregate aggregate fragment 0]
   user@host# set expression expression
   `
3. Configure the name of the service to be included in the aggregate service as a fragment service.
   `
   [edit services scope TM service MirrorAggregate aggregate fragment 0]
   user@host# set service service
   `
4. (Optional) Specify whether the fragment service must be active for the aggregate service to become active.
   `
   [edit services scope TM service MirrorAggregate aggregate fragment 0]
   user@host# set mandatory
   `
5. (Optional) Configure the group name to be applied to each fragment service that is to be part of a redundancy group.
   `
   [edit services scope TM service MirrorAggregate aggregate fragment 0]
   user@host# set redundancy-group redundancy-group
   `
6. (Optional) Specify whether a remote subscriber session is required to subscribe to the fragment service.
   `
   [edit services scope TM service MirrorAggregate aggregate fragment 0]
   user@host# set subscription-required
   `
7. (Optional) Configure the list of substitutions that are used as arguments for the fragment to become active.
   `
   [edit services scope TM service MirrorAggregate aggregate fragment 0]
   user@host# set substitution [ substitution... ]
   `
8. (Optional) Verify your configuration.

       [edit services scope TM service MirrorAggregate aggregate fragment 0]
       user@host#  show
       expression
       "vr=\"<- substitution.vrNames ->\", interfaceName=\"FORWARDING_INTERFACE\"";
       service MirrorFragment;
       substitution fragSubrIps=subrIps;

#### Related Topics

- Overview of SRC Aggregate Services
- How Parameters Are Passed from Aggregate Service to Fragment Service
- Configuring Service Fragments for an Aggregate Service (C-Web Interface)
- Using Python Expressions in a Subscriber Reference Expression

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