Example: Configuring Damping Parameters

This example shows how to configure damping parameters.

• 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 configure damping parameters:

1. Create the routing policy.

   [edit]user@host# edit policy-options policy-statement dampenpolicy1

2. Create the routing term.

   [edit policy-options policy-statement policy-statement dampenpolicy1]user@host# edit term dampenterm1

3. Specify the routes to dampen and associate each group of routes with a group name.

   [edit policy-options policy-statement dampenpolicy1 term dampenterm1]user@host# set from route-filter 172.16.0.0/12 orlonger damping group1user@host# set from route-filter 192.168.0.0/16 orlonger user@host# set from route-filter 10.0.0.0/8 orlonger

4. Create and configure the damping parameter groups.

   [edit policy-options damping]user@host# set group1 half-life 30 max-suppress 60 reuse 750 suppress 3000user@host# set group2 half-life 40 max-suppress 45 reuse 1000 suppress 400user@host# set group3 disable

5. Enable damping for BGP.

   [edit]user@host# set protocols bgp damping

6. Apply the policy as an import policy for the BGP neighbor.

   [edit ]user@host# set protocols bgp group groupA neighbor 172.16.15.14 import dampenpolicy1

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

Results

Confirm your configuration by entering the show policy-options and show protocols bgp 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 Damping Parameters
• Verifying the Routing Policy

Verifying the Damping Parameters

Purpose

Verify that the policy and term are configured on the device and that the appropriate damping parameters are specified within the term.

Action

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

Verifying the Routing Policy

Purpose

Verify that damping is enabled for BGP and that the routing policy is applied to the routing protocol.

Action

From operational mode, enter the show protocols bgp command.

Related Topics

• Junos OS Feature Support Reference for SRX Series and J Series Devices
• Routing Policies Configuration Overview
• Understanding Damping Parameters