Managing Policies On The E Series Router; Policy Management Overview; Description Of A Policy; Policy Platform Considerations - Juniper POLICY MANAGEMENT - CONFIGURATION GUIDE V11.1.X Configuration Manual

Chapter 1

Managing Policies on the E Series Router

Policy Management Overview

This chapter discusses the following topics:
Policy Management Overview on page 3
Description of a Policy on page 5
Policy Platform Considerations on page 5
Policy References on page 6
Policy Management Configuration Tasks on page 6
This chapter introduces policy-based routing management on E Series routers. Policy
management enables you to configure, manage, and monitor policies that selectively
cause packets to take different paths without requiring a routing table lookup. The
JUNOSe software's packet-mirroring feature uses secure policies.
Policy management enables network service providers to configure services that
customize the treatment of individual packet flows received on a subscriber's
interface. The main tool for implementing policy management is a policy list. A policy
list is a set of rules, each of which specifies a policy action. A rule is a policy action
optionally combined with a classification.
Packets are sorted at ingress or egress into packet flows based on attributes defined
in classifier control lists (CLACLs). You can apply policy lists to packets arriving and
leaving an interface. You can use policy management on ATM, Frame Relay, generic
routing encapsulation (GRE), IP, IPv6, Layer 2 Tunneling Protocol (L2TP), Multiprotocol
Label Switching (MPLS), and virtual local area network (VLAN) traffic.
Policy management provides:
Policy routing Predefines a classified packet flow to a destination port or IP
address. The router does not perform a routing table lookup on the packet. This
provides superior performance for real-time applications.
Bandwidth management Rate-limits a classified packet flow at ingress to enforce
ingress data rates below the physical line rate of a port, A rate-limit profile with
a policy rate-limit profile rule provides this capability. You can construct policies
to provide rate limiting for individual packet flows or for the aggregate of multiple
packet flows. Juniper Networks E Series Broadband Services Router rate limits
are calculated based on the layer 2 packet size. To configure rate limiting, you
first create a rate-limit profile, which is a set of bandwidth attributes and
Policy Management Overview
3