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Allied Telesis AlliedWare Plus Overview

Download Overview of Allied Telesis Switchblade AT-x908 Software, Switch for Free or View it Online on All-Guides.com. This version of Allied Telesis Switchblade AT-x908 Manual compatible with such list of devices, as: Switchblade AT-x908, AlliedWare Plus, Switchblade AT-x900-12, Switchblade AT-x900-24, SwitchBlade x908 Series

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C613-16120-00 REV A

www.alliedtelesis.com

AlliedWare Plus

TM

OS

Overview of |

Introduction

This How To Note describes the main features of QoS on switches running the

AlliedWare Plus OS. The main features include:

z Prioritisation and marking

Right at the point of ingress into the QoS process, packets classified to particular class

maps can have values written to one or more of their associated “markers”. The markers

can be externally visible fields (DSCP value, 802.

1

p value) and/or internally visible fields

(bandwidth class and queue number). These markers are explained in "Packet markers" on

page 4.

z Policing

Packets belonging to any given class map can be assigned a colour (bandwidth class) based

on whether they are inside or outside the bandwidth limits set for that class map. The

packets are marked with the colour that was applied to them, and at various points in the

QoS process, decisions on the packets' fate can be made on the basis of what colour they

have been marked with.

z Remarking

After policing, remarking can update packets’ QoS markers depending on how well the

flow conforms to its bandwidth limits. For example, if a flow exceeds its bandwidth

requirements, QoS can update the packets’ DSCP values.

z Per-port control over egress queue parameters

Queue lengths, scheduling process, relative weights, etc can be set on all queues on a per-

port basis.

z Highly configurable default class map

All the parameters that can be set on a normal class map can also be set on the default

class map (the catch-all class map that matches all traffic that does not explicitly match any

other class map).

Quality of Service Features on x900-

1

2,

x900-24, and SwitchBlade x908 Switches