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Understanding Application Sets

You specify an application, or service, to indicate that a policy applies to traffic of that type. Sometimes the same applications or a subset of them can be present in multiple policies, making them difficult to manage. JUNOS software allows you to create groups of applications called application sets.

Before You Begin

For background information, read:

Application sets simplify the process by allowing you to manage a small number of application sets, rather than a large number of individual application entries.

The application (or application set) is configured as a match criterion for packets. Packets must be of the application type specified in the policy for the policy to apply to the packet. If the packet matches the application type specified by the policy and all other criteria match, then the policy action is applied to the packet. You can use predefined or custom applications and refer to them in a policy.

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