Policy Route; Chapter 15 Policy Route; Overview; What You Can Do In This Chapter - ZyXEL Communications FSG2200HNU User Manual

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H A P T E R

15.1 Overview

This chapter covers setting and applying policies used for IP routing.
Traditionally, routing is based on the destination address only and the ZyXEL
Device takes the shortest path to forward a packet. IP Policy Routing (IPPR)
provides a mechanism to override the default routing behavior and alter the
packet forwarding based on the policy defined by the network administrator.
Policy-based routing is applied to incoming packets for each interface, prior to the
normal routing.

15.1.1 What You Can Do in this Chapter

Use the Rule Setup screens
policy route entries and configure a policy route to override the default (shortest
path) routing behavior and forward packets based on the criteria you specify.

15.1.2 What You Need to Know

Benefits
• Source-Based Routing – Network administrators can use policy-based routing to
direct traffic from different users through different connections.
• Quality of Service (QoS) – Organizations can differentiate traffic by setting the
precedence or DSCP values in the IP header at the periphery of the network to
enable the backbone to prioritize traffic.
• Cost Savings – IPPR allows organizations to distribute interactive traffic on high-
bandwidth, high-cost paths while using low-cost paths for batch traffic.
• Load Sharing – Network administrators can use IPPR to distribute traffic among
multiple paths.
Routing Policy
Individual routing policies are used as part of the overall IPPR process. A policy
defines the matching criteria and the action to take when a packet meets the
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Policy Route

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