Proxicast LAN-Cell 2 User's Guide download pdf (Page 343)

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LAN-Cell 2 User’s Guide

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CHAPTER 17

Policy Route Screens

17.1 Overview

Traditionally, routing is based on the destination address only and the LAN-Cell 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 on a per interface

basis, prior to the normal routing.

17.1.1 What You Can Do in the Policy Route Screens

• Use the Policy Route Summary screen (Section 17.2 on page 344) to display the current

policy route entries.

• Use the Policy Route Edit screen (Section 17.3 on page 345) to configure a policy route

to override the default.

17.1.2 What You Need To Know About Policy Route

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 ToS (Type of Service) 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 criteria. The action is taken

only when all the criteria are met. The criteria include the source address and port, IP protocol

(ICMP, UDP, TCP, etc.), destination address and port, ToS and precedence (fields in the IP

header) and length. The inclusion of length criterion is to differentiate between interactive and

bulk traffic. Interactive applications, e.g., telnet, tend to have short packets, while bulk traffic,

e.g., file transfer, tends to have large packets.

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