Allied-telesis Rapier Switch User Manual download pdf

While every effort has been made to ensure that the information contained within this applicaton note is

accurate, Allied Telesyn International can not accept any liability for errors in, or omissions arising from the use

of this information.

Allied Telesyn Ingress Rate Limiting on

Rapier-i Switches

Introduction

This application note describes the Ingress Rate Limiting feature on the Allied

Telesyn Rapier-i series switches, and explains the effect that configuring

Ingress Rate Limiting on a switch port can have on a TCP session flowing

through that port.

You can find further information about this topic in the Documentation Set for

your Allied Telesyn device, from www.alliedtelesyn.co.nz/documentation/

documentation.html, and from the References section at the end of this

document.

Ingress rate limiting is set with the INGRESSLIMIT parameter of the SET

SWITCH PORT command. It allows you to specify the maximum bandwidth

for traffic ingressing specified ports.

How ingress rate limiting works on the Rapier-i

Ingress Rate Limiting on the Rapier - i series switches uses what is known as a

‘token bucket’ model, where an arriving packet gains ingress to the port by

removing ‘admission tokens’ from a bucket. The larger the packet, the more

tokens it needs. Tokens are added to the bucket at a rate that is set by the

configured Ingress Rate Limit. Once the bucket is full, no further tokens can be

stockpiled. A packet arriving at the port will be accepted only if the bucket

contains sufficient tokens. A burst of traffic will cause the rapid depletion of

the tokens in the bucket and, once the bucket is empty, packets will be

dropped. On the Rapier-i series switches, there is no facility for queueing

incoming packets. Until the bucket is replenished, the packets are dropped. See

Figure 1 on page 2.

A guide to Ingress Rate

Limiting on Rapier-i

Switches.

1 2 3 4

Summary of Contents

Page 1 - Rapier-i Switches

Page 2 - 2 Application Note

2 Application NoteAllied Telesyn Guide to Ingress Rate Limiting on the Rapier-iC613-43002-00 REV A19 June 2003Figure 1: The token bucket modelThe cons

Page 3 - References

Application Note 3Allied Telesyn Guide to Ingress Rate Limiting on the Rapier-iC613-43002-00 REV AJune 23, 2003 Add ports 1 and 2 to the VLAN, using

Page 4 - 4 Application Note

4 Application NoteAllied Telesyn Guide to Ingress Rate Limiting on the Rapier-iC613-43002-00 REV A19 June 2003

Allied-telesis Rapier Switch User Manual

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Allied-telesis Rapier Switch User Manual

Browse online or download User Manual for Computer Accessories Allied-telesis Rapier Switch. Allied Telesis Rapier Switch User Manual

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