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Table of Contents

Routing Policy Feature Guide for Routing Devices

This guide provides an overview of both the routing policy concepts and routing policy framework for devices running Junos OS. A routing policy is a mechanism in Junos OS that allows you to modify the routing policy framework to suit your needs. The routing policy framework is a collection of Junos OS policies that allows you to control flows of routing information and packets. This page contains information about configuring routing policies.

Junos OS, Release 13.2

Overview
Configuration
Administration
Troubleshooting

Introduction to Routing Policy

Policy Framework Overview

Comparison of Routing Policies and Firewall Filters

Understanding Routing Policies

Default Routing Policies

Routing Policy Evaluation

How a Routing Policy Is Evaluated

Understanding Policy Expressions

Route Filters
Understanding Route Filters for Use in Routing Policy Match Conditions

Prefix Lists
Understanding Prefix Lists for Use in Routing Policy Match Conditions

Policy Chains
How a Routing Policy Chain Is Evaluated

Subroutines

Understanding Policy Subroutines in Routing Policy Match Conditions

How a Routing Policy Subroutine Is Evaluated

AS Paths

Understanding AS Path Regular Expressions for Use as Routing Policy Match Conditions

Understanding Prepending AS Numbers to BGP AS Paths

Understanding Adding AS Numbers to BGP AS Paths

Communities

Understanding BGP Communities and Extended Communities as Routing Policy Match Conditions

Understanding How to Define BGP Communities and Extended Communities

How BGP Communities and Extended Communities Are Evaluated in Routing Policy Match Conditions

Testing Policies
Understanding Routing Policy Tests

Damp BGP Route Flapping

Understanding Damping Parameters

Using Routing Policies to Damp BGP Route Flapping

Source Class Usage and Destination Class Usage
Understanding Source Class Usage and Destination Class Usage Options

Conditional Routing Policies

Understanding Conditional Installation of Prefixes in a Routing Table

Conditional Installation of Prefixes Use Cases

Dynamic Routing Policies
Understanding Dynamic Routing Policies

Discard Routing Policy
Understanding Forwarding Packets to the Discard Interface

Reference Tables

Categories of Routing Policy Match Conditions

Routing Policy Match Conditions

Route Filter Match Conditions

Summary of Routing Policy Actions

Actions in Routing Policy Terms

Protocol Support for Import and Export Policies

Related Documentation

BGP Feature Guide for Routing Devices

Introduction to Routing Policy

Policy Framework Overview

Comparison of Routing Policies and Firewall Filters

Understanding Routing Policies

Default Routing Policies

Routing Policy Evaluation

How a Routing Policy Is Evaluated

Understanding Policy Expressions

Route Filters
Understanding Route Filters for Use in Routing Policy Match Conditions

Prefix Lists
Understanding Prefix Lists for Use in Routing Policy Match Conditions

Policy Chains
How a Routing Policy Chain Is Evaluated

Subroutines

Understanding Policy Subroutines in Routing Policy Match Conditions

How a Routing Policy Subroutine Is Evaluated

AS Paths

Understanding AS Path Regular Expressions for Use as Routing Policy Match Conditions

Understanding Prepending AS Numbers to BGP AS Paths

Understanding Adding AS Numbers to BGP AS Paths

Communities

Understanding BGP Communities and Extended Communities as Routing Policy Match Conditions

Understanding How to Define BGP Communities and Extended Communities

How BGP Communities and Extended Communities Are Evaluated in Routing Policy Match Conditions

Testing Policies
Understanding Routing Policy Tests

Damp BGP Route Flapping

Understanding Damping Parameters

Using Routing Policies to Damp BGP Route Flapping

Source Class Usage and Destination Class Usage
Understanding Source Class Usage and Destination Class Usage Options

Conditional Routing Policies

Understanding Conditional Installation of Prefixes in a Routing Table

Conditional Installation of Prefixes Use Cases

Dynamic Routing Policies
Understanding Dynamic Routing Policies

Discard Routing Policy
Understanding Forwarding Packets to the Discard Interface

Reference Tables

Categories of Routing Policy Match Conditions

Routing Policy Match Conditions

Route Filter Match Conditions

Summary of Routing Policy Actions

Actions in Routing Policy Terms

Protocol Support for Import and Export Policies

Routing Policy Evaluation

Example: Applying Routing Policies at Different Levels of the BGP Hierarchy

Example: Configuring a Conditional Default Route Policy

Example: Using Routing Policy in an ISP Network

Example: Disabling Suppression of Route Advertisements

Example: Configuring BGP to Advertise the Best External Route to Internal Peers

Example: Setting BGP to Advertise Inactive Routes

Example: Rejecting Known Invalid Routes

Example: Using Routing Policy to Set a Preference Value for BGP Routes

Route Filters

Example: Configuring Policy Chains and Route Filters

Example: Configuring a Route Filter Policy to Specify Priority for Prefixes Learned Through OSPF

Example: Configuring the MED Using Route Filters

Example: Configuring Layer 3 VPN Protocol Family Qualifiers for Route Filters

Prefix Lists
Example: Configuring Routing Policy Prefix Lists

Subroutines
Example: Configuring a Policy Subroutine

AS Paths

Example: Using AS Path Regular Expressions

Example: Configuring a Routing Policy to Prepend the AS Path

Example: Advertising Multiple Paths in BGP

Communities

Example: Configuring Communities in a Routing Policy

Example: Configuring Extended Communities in a Routing Policy

Example: Defining a Routing Policy Based on the Number of BGP Communities

Example: Defining a Routing Policy That Removes BGP Communities

Testing Policies
Example: Testing a Routing Policy with Complex Regular Expressions

Damp BGP Route Flapping

Example: Configuring Damping Parameters

Example: Configuring BGP Route Flap Damping Based on the MBGP MVPN Address Family

Source Class Usage and Destination Class Usage
Example: Grouping Source and Destination Prefixes into a Forwarding Class

Conditional Routing Policies
Example: Configuring Conditional Installation of Prefixes in a Routing Table

Dynamic Routing Policies
Example: Configuring Dynamic Routing Policies

Discard Routing Policy
Example: Forwarding Packets to the Discard Interface

Routing Policy Configuration Statements

if-route-exists

export (Protocols BGP)

export (Protocols IS-IS)

export (Protocols DVMRP)

export (Protocols LDP)

export (Protocols MSDP)

export (Protocols OSPF)

export (Protocols PIM)

export (Protocols PIM Bootstrap)

export (Protocols RIP)

export (Protocols RIPng)

export (Routing Options)

import (Protocols BGP)

import (Protocols DVMRP)

import (Protocols LDP)

import (Protocols MSDP)

import (Protocols OSPF)

import (Protocols PIM)

import (Protocols PIM Bootstrap)

import (Protocols RIP)

import (Protocols RIPng)

import (Routing Options)

policy-statement

prefix-list-filter

rtf-prefix-list

Routing Policy Operational Commands

show policy conditions

show policy damping

show route active-path

show route advertising-protocol

show route aspath-regex

show route best

show route brief

show route community

show route community-name

show route damping

show route detail

show route exact

show route export

show route extensive

show route flow validation

show route forwarding-table

show route hidden

show route inactive-path

show route inactive-prefix

show route instance

show route next-hop

show route no-community

show route output

show route protocol

show route receive-protocol

show route table

show route terse

show validation database

show validation group

show validation replication database

show validation session

show validation statistics

Troubleshooting
Knowledge Base
http://kb.juniper.net/

Supported Platforms

Downloads

Download this guide: Routing Policy

Related Documentation

BGP Feature Guide for Routing Devices

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