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S600-E V200R013C00 Configuration Guide - IP Unicast Routing

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, Routing Policy, IP Routing Table Management, and PBR.

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Overview of PBR

Overview of PBR

Definition

Policy-based routing (PBR) allows switches to select routes based on user-defined policies. After PBR is configured on the device, if the received packets (including Layer 2 packets) match PBR rules, the device forwards the packets according to the rules. If the packets do not match PBR rules, the device forwards the packets according to the destination address of the packets.

NOTE:
The main differences between PBR and routing policies are:
  • PBR changes the forwarding path of packets based on user-defined policies instead of based on the routes in an IP routing table.
  • Routing policies change the forwarding path of packets by filtering routes and setting route attributes. For example, route attributes (including reachability) can be set to change the forwarding path of network traffic.

Purpose

Traditionally, to determine the routes used to forward packets, a switch searches its IP routing table based on the destination address carried in the packets. To allow switches to route packets based on user-defined policies, PRB can be configured.

Benefits

PBR has the following advantages:

  • Allows network administrators to define policies for routing packets, improving route selection flexibility.
  • Enables different data flows to be forwarded on different links, increasing link efficiency.
  • Allows cost-effective links to be used for transmitting service data without affecting service quality, reducing the cost of enterprise data services.
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Updated: 2019-04-08

Document ID: EDOC1100066165

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