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CLI-based Configuration Guide - IP Unicast Routing

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
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Overview of PBR

Overview of PBR

Definition

Policy-based routing (PBR) is a mechanism that makes routing decisions based on user-defined policies. PBR includes local PBR, interface PBR, and smart policy routing (SPR).

NOTE:
  • The differences between PBR and routing policy are as follows:
    • PBR implements routing based on packets. It routes data packets based on user-defined policies instead of following the routes in the existing routing table.
    • Routing policies implement routing based on routing information. Routing policies are used to filter routes and set route attributes. You can change route attributes (including reachability) to change a route over which network traffic is transmitted.

    For details on routing policies, see Routing Policy Configuration.

Purpose

Traditionally, devices search routing tables for routes of packets based on their destination addresses and then forward the packets. Currently, more users require that devices route packets based on user-defined policies. PBR allows network administrators to make user-defined policies to change packet routes based on source addresses, packet size, and link quality in addition to destination addresses.

Benefits

PBR has the following advantages:

  • Allows network administrators to make user-defined policies for routing packets, which improves flexibility of route selection.
  • Allows different data flows to be forwarded on different links, which increases link usage.
  • Uses cost-effective links to transmit service data without affecting service quality, which reduces the cost of enterprise data services.
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Updated: 2019-05-20

Document ID: EDOC1100034072

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