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Example: Rejecting Known Invalid Routes

This example shows how to create route-based match conditions for a routing policy.

Requirements

Before you begin, be sure your router interfaces and protocols are correctly configured.

Overview

In this example, you create a policy called rejectpolicy1 that rejects routes with a mask of /8 and greater (/8, /9, /10, and so on) that have the first 8 bits set to 0. This policy also accepts routes less than 8 bits in length by creating a mask of 0/0 up to /7.

Topology

Configuration

Procedure

CLI Quick Configuration

To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, and then copy and paste the commands into the CLI at the [edit] hierarchy level.

Step-by-Step Procedure

To create a policy that rejects known invalid routes:

  1. Create the routing policy.

  2. Create the policy term.

  3. Create a mask that specifies which routes to accept.

  4. Create a mask that specifies which routes to reject.

Results

Confirm your configuration by entering the show policy-options command 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 Route-Based Match Conditions

Purpose

Verify that the policy and term are configured on the device with the appropriate route-based match conditions.

Action

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

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