# Applying a Profile to Interfaces with Service Manager

Applying a profile to the interface where the subscriber sends and receives traffic activates service for a subscriber. Similarly, to deactivate a service, you reapply the respective profile with a negate flag.

You can use a profile to apply the policy parameters configuration for an interface. When you apply a profile containing relevant policy parameter commands to an interface, the parameter configuration is uniquely maintained for each dynamic interface created using this profile. The policy parameters are not deactivated when the corresponding service containing them is deactivated and can only be modified or created by service activations.

If you write service manager macros, you should define the rate-limit hierarchy when you create the policies and profiles associated with the services to be deployed.