Example: Grouping Source and Destination Prefixes into a Forwarding Class

This example shows how to group source and destination prefixes into a forwarding class.

• Requirements
• Overview
• Configuration
• Verification

Requirements

Before you begin, configure router interfaces and configure routing protocols, as explained in Routing Policies Configuration Overview.

Overview

In this example, you configure a routing policy called policy1and a corresponding routing term called term1. Within the term, you configure the route filter to include source routes greater than or equal to 10.210.0.0/16 and destination routes greater than or equal to 10.215.0.0/16. Then you group the source and destination prefixes into a forwarding class called forwarding-class1 and apply policy1 to the forwarding table. The routing policy is evaluated when routes are being exported from the routing table into the forwarding table. Only the active routes are exported from the routing table.

Configuration

CLI Quick Configuration

To quickly group source and destination prefixes in a forwarding class, copy the following commands and paste them into the CLI.

Step-by-Step Procedure

The following example requires you to navigate various levels in the configuration hierarchy. For information about navigating the CLI, see Using the CLI Editor in Configuration Mode.

To group source and destination prefixes in a forwarding class:

1. Create the routing policy.

   [edit]user@host# edit policy-options policy-statement policy1

2. Create the routing term.

   [edit policy-options policy-statement policy1]user@host# edit term term1

3. Specify the source routes to include in the route filter.

   [edit policy-options policy-statement policy1 term term1]user@host# set from route-filter 10.210.0.0/16 orlonger

4. Specify the destination routes to include in the route filter.

   [edit policy-options policy-statement policy1 term term1]user@host# set from route-filter 10.215.0.0/16 orlonger

5. Group the source and destination prefixes into the forwarding class.

   [edit policy-options policy-statement policy1 term term1]user@host# set then forwarding-class forwarding-class1

6. Apply the routing policy to the forwarding table.

   [edit]user@host# set routing-options forwarding-table export policy1

   Note: You can refer to the same routing policy one or more times in the same or different export statement.

Results

Confirm your configuration by entering the show policy-options and show routing-options commands from configuration mode. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.

If you are done configuring the device, enter commit from configuration mode.

Verification

To confirm that the configuration is working properly, perform these tasks:

• Verifying the Forwarding Class
• Verifying the Routing Policy

Verifying the Forwarding Class

Purpose

Verify that the forwarding table is applied to the routing policy.

Action

From operational mode, enter the show routing-options command.

Verifying the Routing Policy

Purpose

Verify that the policy and term are configured on the device with the appropriate routes included in the forwarding class.

Action

From operational mode, enter the show policy-options command.

Related Topics

• Junos OS Feature Support Reference for SRX Series and J Series Devices
• Routing Policies Configuration Overview
• Understanding Route-Based Match Conditions
• Example: Rejecting Known Invalid Routes