Specifications

CHAPTER

10-1

Catalyst 4224 Access Gateway Switch Software Configuration Guide

OL-2031-02

Traffic Shaping

Cisco IOS Quality of Service (QoS) software includes four types of traffic

shaping:

• Generic Traffic Shaping (GTS)

• Class-Based Traffic Shaping

• Frame Relay Traffic Shaping (FRTS)

• Distributed Traffic Shaping (DTS)

All four traffic shaping methods are similar in implementation, though their

command line interfaces (CLIs) differ somewhat and they use different types of

queues to contain and shape traffic that is deferred. If a packet is deferred, GTS

and Class-Based Shaping use a weighted fair queue to hold the delayed traffic.

FRTS uses either a custom queue or a priority queue.

This section explains how traffic shaping works and describes the Cisco IOS QoS

traffic shaping mechanisms. It also described traffic-shaping feature called Low

Latency Traffic Shaping (LLQ).

This section contains the following topics:

• About Traffic Shaping, page 10-2

• Generic Traffic Shaping, page 10-6

• Class-Based Traffic Shaping, page 10-8

• Frame Relay Traffic Shaping, page 10-9

• Distributed Traffic Shaping, page 10-12

• Low-Latency Queueing, page 10-14