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Routing Policy Configuration Guide

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 Documentation, Release 12.3

Overview
Configuration
Administration
Troubleshooting

Introduction to Policy Framework

Policy Framework Overview

Router Flows Affected by Policies

Policy Architecture

Policy Components

Default Policies and Actions

Routing Policies Configuration Overview

Policy Configuration Recommendations

Comparison of Routing Policies and Firewall Filters

Introduction to Routing Policy

Understanding Routing Policies

Importing and Exporting Routes

Default Routing Policies and Actions

Creating Routing Policies

Configuring a Routing Policy

Routing Policy Named Match Conditions

Route-Based Match Conditions

Protocol-Based Match Conditions

Routing Policy Actions

Routing Policy Terms

Applying a Routing Policy

Routing Protocol Support for Import and Export Policies

Applying a Routing Policy to Routing Protocols

Applying Export Policies to the Forwarding Table

Evaluating a Routing Policy

How a Routing Policy Is Evaluated

How a Routing Policy Chain Is Evaluated

How a Routing Policy Expression Is Evaluated

How a Routing Policy Subroutine Is Evaluated

Routing Policy Tests

Introduction to Extended Match Conditions Configuration

Understanding BGP Communities and Extended Communities as Routing Policy Match Conditions

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

Introduction to Extended Actions Configuration
Overview of Per-Packet Load Balancing

Introduction to Traffic Sampling, Forwarding, and Monitoring Overview
Traffic Sampling, Forwarding, and Monitoring Overview

Introduction to Traffic Forwarding and Monitoring Configuration
Per-Flow and Per-Prefix Load Balancing Overview

Routing Policy Configuration Statements

Configuring a Routing Policy

Minimum Routing Policy Configuration

Minimum Routing Policy Chain Configuration

Minimum Subroutine Configuration

Routing Policy Configuration

Defining Routing Policies

Configuring Match Conditions in Routing Policy Terms

Configuring Actions in Routing Policy Terms

Applying Routing Policies and Policy Chains to Routing Protocols

Applying Policy Expressions to Routes Exported from Routing Tables

Applying Routing Policies to the Forwarding Table

Configuring Dynamic Routing Policies

Forwarding Packets to the Discard Interface

Testing Routing Policies

Example: Creating a Routing Policy

Routing Policy Examples

Example: Creating a Routing Policy Term

Example: Rejecting Known Invalid Routes

Examples: Configuring Static Routes

Example: Defining a Routing Policy from BGP to IS-IS

Example: Using Routing Policy to Set a Preference

Example: Importing and Exporting Access and Access-Internal Routes in a Routing Policy

Example: Exporting Routes to IS-IS

Example: Applying Export and Import Policies to BGP Peer Groups

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

Example: Applying a Prefix to Routes Learned from a Peer

Example: Redistributing BGP Routes with a Specific Community Tag into IS-IS

Example: Redistributing OSPF Routes into BGP

Example: Exporting Direct Routes Into IS-IS

Example: Exporting Internal IS-IS Level 1 Routes to Level 2

Example: Exporting IS-IS Level 2 Routes to Level 1

Example: Assigning Different Forwarding Next-Hop LSPs to Different Destination Prefixes

Example: Grouping Destination Prefixes

Example: Grouping Source Prefixes

Example: Grouping Source and Destination Prefixes into a Forwarding Class

Example: Accepting Routes with Specific Destination Prefixes

Example: Accepting Routes from BGP with a Specific Destination Prefix

Example: Using Routing Policy in an ISP Network

Example: Overriding the Default BGP Routing Policy on Packet Transport Switches

Understanding ECMP Flow-Based Forwarding

Example: Configuring ECMP Flow-Based Forwarding

Extended Match Conditions Configuration

Configuring AS Path Regular Expressions to Use as Routing Policy Match Conditions

Defining BGP Communities and Extended Communities for Use in Routing Policy Match Conditions

Including BGP Communities and Extended Communities in Routing Policy Match Conditions

Using Routing Policies to Prevent Advertisement of BGP Communities to Neighbors

Examples: Configuring BGP Communities as Routing Policy Match Conditions

Configuring Prefix Lists for Use in Routing Policy Match Conditions

Example: Configuring a Prefix List

Configuring Route Lists for Use in Routing Policy Match Conditions

Configuring Subroutines in Routing Policy Match Conditions

Configuring Routing Policy Match Conditions Based on Routing Table Entries

Extended Actions Configuration

Prepending AS Numbers to BGP AS Paths

Example: Configuring a Routing Policy to Prepend the AS Path

Adding AS Numbers to BGP AS Paths

Using Routing Policies to Damp BGP Route Flapping

Configuring Per-Packet Load Balancing

Configuring Load Balancing Based on MPLS Labels on DPC I-Chip-Based Hardware

Configuring Load Balancing for Ethernet Pseudowires

Configuring Load Balancing Based on MAC Addresses

Configuring VPLS Load Balancing Based on IP and MPLS Information

Configuring VPLS Load Balancing on MX Series 3D Universal Edge Routers

Example: Configuring Multicast Load Balancing over Aggregated Ethernet Links

Traffic Sampling Configuration

Traffic Sampling Configuration

Minimum Traffic Sampling Configuration

Configuring Traffic Sampling

Disabling Traffic Sampling

Configuring the Output File for Traffic Sampling

Tracing Traffic-Sampling Operations

Configuring Flow Aggregation (cflowd)

Configuring Active Flow Monitoring Using Version 9

Traffic Sampling Examples

Example: Sampling a Single SONET/SDH Interface

Example: Sampling All Traffic from a Single IP Address

Example: Sampling All FTP Traffic

Traffic Forwarding and Monitoring Configuration

Configuring Traffic Forwarding and Monitoring

Configuring Forwarding Table Filters

Applying Filters to Forwarding Tables

Configuring IPv6 Accounting

Configuring Discard Accounting

Configuring Flow Monitoring

Forwarding Table Filters for Routing Instances on ACX Series Routers

Configuring Load-Balance Groups

Configuring Next-Hop Groups

Configuring Per-Prefix Load Balancing

Configuring Per-Flow Load Balancing Based on Hash Values

Configuring Routers, Switches, and Interfaces as DHCP and BOOTP Relay Agents

Configuring DNS and TFTP Packet Forwarding

Preventing DHCP Spoofing on MX Series 3D Universal Edge Routers

Configuring Port Mirroring

Configuring Packet Capture

Routing Policy Reference

Protocols That Can Be Imported to and Exported from the Routing Table

Routing Tables Affected by Routing Policies

Default Import and Export Policies for Protocols

Routing Policy Match Conditions

Protocol Support for Import and Export Policies

Summary of Routing Policy Configuration Statements

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

Summary of Traffic Sampling, Forwarding, and Monitoring Configuration Statements

autonomous-system-type

cflowd (Discard Accounting)

cflowd (Flow Monitoring)

client-response-ttl

dhcp-relay (DHCP Spoofing Prevention)

enhanced-hash-key

family (Filtering)

family (Monitoring)

family (Port Mirroring)

family (Sampling)

family multiservice

file (Extended DHCP Relay Agent and Helpers Trace Options)

file (Packet Capture)

file (Sampling)

file (Trace Options)

filename (Packet Capture)

filename (Sampling)

files (Packet Capture)

files (Sampling and Traceoptions)

filter (IPv4, IPv6, and MPLS)

flow-active-timeout

flow-export-destination

flow-inactive-timeout

forwarding-options

group (DHCP Spoofing Prevention)

indexed-load-balance

input (Forwarding Table)

input (Port Mirroring)

input (Sampling)

interface (Accounting or Sampling)

interface (BOOTP)

interface (DHCP Spoofing Prevention)

interface (DNS and TFTP Packet Forwarding or Relay Agent)

interface (Monitoring)

interface (Next-Hop Group)

interface (Port Mirroring)

load-balance-group

max-packets-per-second

maximum-capture-size

maximum-hop-count

maximum-packet-length

minimum-wait-time

no-filter-check

output (Accounting)

output (Forwarding Table)

output (Monitoring)

output (Port Mirroring)

output (Sampling)

port (Packet Forwarding)

relay-agent-option

route-accounting

sampling (Forwarding Options)

server (DHCP and BOOTP Relay Agent)

server (DNS and TFTP Service)

size (Packet Capture)

size (Sampling and Traceoptions)

traceoptions (DNS and TFTP Packet Forwarding)

traceoptions (Port Mirroring and Traffic Sampling)

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

Downloads

Download this guide: Routing Policy Configuration Guide

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