# Define exceptions to the Link Usage Profile for an NGFW Engine

NGFW Engine-specific exceptions to the Link Usage Profile allow you specify which traffic uses specific NetLinks.

## Before you begin

Select a Link Usage Profile element for the NGFW Engine.

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For example, if you do not want some traffic to be balanced between the NetLinks, add an exception to direct the traffic through a specific NetLink.

For more details about the product and how to configure features, click Help or press F1.

## Steps

1. Select Configuration.
2. Right-click an NGFW Engine, then select Edit <element type>.
3. Browse to Routing > Link Usage.
4. To add a row the Exceptions to Link Usage Profile table, click Add, then define the matching criteria.
5. Click Save and Refresh.

## Engine Editor > Routing > Link Usage

Use this branch to select a Link Usage Profile for an NGFW Engine and to define link usage exceptions for the NGFW Engine.

Option | Definition
--- | ---
Link Usage Profile | To enable dynamic link selection for the NGFW Engine, select a Link Usage Profile element.
Link Usage Profile Properties (read only) (Not editable) | Shows the properties of the selected Link Usage Profile element.
Exceptions to Link Usage Profile table (When a Link Usage Profile element has been selected) Click Add to add a row to the table, or Remove to remove the selected row. Click Up or Down to move the selected item up or down.
Source | The source IP addresses or users that the rule matches. Double-click the cell to select an element. You can also use type-ahead search to select an element.
Destination | The destination IP addresses or users that the rule matches. Double-click the cell to select an element. You can also use type-ahead search to select an element.
Service | The service or Network Application that the rule matches. Double-click the cell to select an element. You can also use type-ahead search to select an element.
ISP Link | The NetLink that traffic that matches the rule uses. Double-click the cell to select an element.
Comment (Optional) | A comment for your own reference.