Changing the Default Learning for Unknown MAC Addresses

By default, the Juniper Networks device uses packet flooding to learn the outgoing interface for an unknown destination MAC address. You can specify that the device use ARP and trace-route packets or only ARP requests to learn this information.

This example configures the device to use ARP queries without trace-route requests to learn the outgoing interface for an unknown destination MAC address.

You can use either J-Web or the CLI configuration editor to change the device’s default method for learning unknown MAC addresses.

This topic covers:

• J-Web Configuration
• CLI Configuration
• Related Topics

J-Web Configuration

To enable the device to use only ARP requests to learn unknown destination MAC addresses:

1. Select Configure>CLI Tools>Point and Click CLI.
2. Next to Security, click Configure or Edit.
3. Next to Flow, click Configure or Edit.
4. Next to Bridge, click Configure.
5. Select No packet flooding, and select Configure.
6. Select No trace route.
7. Click OK to return to the Bridge page.
8. Click OK to return to the Flow page.
9. Click OK to return to the Security page.

CLI Configuration

To enable the device to use only ARP requests to learn unknown destination MAC addresses:

Related Topics

• Changing the Default Forwarding Behavior