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S600-E V200R011C10 Configuration Guide - IP Unicast Routing

This document describes IP Unicast Routing configurations supported by the switch, including the principle and configuration procedures of IP Routing Overview, Static Route, RIP, RIPng, OSPF, Routing Policy ,and PBR, and provides configuration examples.
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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:
  • 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, devices search their IP routing tables for routes of packets based on packets' destination addresses and then forward 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 make user-defined policies for routing packets, which improves route selection flexibility.
  • Enables different data flows to be forwarded on different links, which increases link efficiency.
  • 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: 2019-03-30

Document ID: EDOC1000178018

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