Chapter 10: traffic management, Traffic shaping, Overview – Amer Networks E5Web GUI User Manual
Page 657: Traffic management, Chapter 10, traffic management, Section 10.1, “traffic shaping
Chapter 10: Traffic Management
This chapter describes how cOS Core can manage network traffic.
• Traffic Shaping, page 657
• IDP Traffic Shaping, page 679
• Threshold Rules, page 684
• Server Load Balancing, page 687
10.1. Traffic Shaping
10.1.1. Overview
QoS with TCP/IP
A weakness of TCP/IP is the lack of true Quality of Service (QoS) functionality. QoS is the ability to
guarantee and limit network bandwidth for certain services and users. Solutions such as the
Differentiated Services (Diffserv) architecture have been designed to try and deal with the QoS
issue in large networks by using information in packet headers to provide network devices with
QoS information.
cOS Core Diffserv Support
cOS Core supports the Diffserv architecture the following ways:
•
cOS Core forwards the 6 bits which make up the Diffserv Differentiated Services Code Point
(DSCP) as well as copying these bits from the data traffic inside VPN tunnels to the
encapsulating packets.
•
cOS Core copies the 6 DSCP bits into the priority QoS bits of Ethernet VLAN frames on
outbound interfaces.
•
As described later in this chapter, DSCP bits can be used by the cOS Core traffic shaping
subsystem as a basis for prioritizing traffic passing through the Clavister Security Gateway.
•
cOS Core automatically copies the entire Differentiated Service Field (DSField) of inner packets
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