Page 1 © NEC Corporation 2011 NEC Confidential

Presentation: Yes

Submission : Yes Preface

▌This document introduces summary of QoS feature in iPASOLINK. In addition, the below features are introduced. Classification Ingress Policing Egress scheduling and shaping

▌And also, advanced QoS feature with AMR is available.

▌The comments are described in the note column of each slides. Please delete the comments when you submit this material to the customer according to the situation.

Presentation: No

Submission : No

iPASOLINKQoS features

NEC Confidential

Page 3 © NEC Corporation 2011 NEC Confidential

Presentation: Yes

Submission : Yes Summary of iPASO QoS Functions and Features

▌ iPASOLINK series supports fully functioned QoS control▌Profile based QoS management is supported▌Supported classification methods: Port / CoS / IP Precedence / DSCP / MPLS EXP▌ Internal Classification: 8 classes

(8 classes mapped to 4 classes (default) / 8 classes (option) for Egress Queue)▌ Internal Priority to CoS Mapping▌ Ingress policing: CIR, EIR (Two-Rate Three-Color Marking)▌Scheduling: SP, SP+3DWRR, 4DWRR (default) / SP+7DWRR, 2SP+6DWRR (option)▌Congestion Avoidance: Weighted Tail Drop / WRED▌Egress hierarchical shaping (Port + each QoS Class)

Page 4 © NEC Corporation 2011 NEC Confidential

Presentation: Yes

Submission : Yes Classification

Classification

Determines priority according to configurable classification profiles.

• Physical port No.• VLAN CoS• IP Precedence• DSCP• MPLS EXP

Port 1 Pri 7Port 2 Pri 5

Port 4 Pri 0 CoS 7 Pri 7CoS 6 Pri 6

CoS 0 Pri 0DSCP 63 Pri 7

DSCP 0 Pri 0

High priority

Middle priority

Low priority

Page 5 © NEC Corporation 2011 NEC Confidential

Presentation: Yes

Submission : Yes Ingress Policing

Rate Check

Drop

Committed Rate Token Bucket

Exceeded Rate Token Bucket

>

<

>

<

Rate Check

Conforming Frames Marking to Green

Exceeding Frames Marking to Yellow

Violating Frames Marking to Red, and discard

[Time]

[Am

ount

of T

raffi

c]

Discard

Complying Frames

Exceeding Frames

Violating FramesEIR

CIRMeters rate of packet stream (CIR and EIR), and marks three colors (green, yellow or red)

Ingress Policing (per port / per VLAN) Green

Green

Green

Yellow

High priority

Middle priority

Low priority

Page 6 © NEC Corporation 2011 NEC Confidential

Presentation: Yes

Submission : Yes Egress Scheduling and Shaping (8 classes queue)

Class 7

Class 6

Class 3

Class 0

DWRR

SP

Weighted Round Robin according to amount of data

Drops lower priority packet, and divides bandwidth except SP by DWRR

absolute priority

Mapping to class queue

After absolute priority traffic is empty, remain priority traffic is transmitted.

Shaping(per port / per class)

Egress Scheduling (SP+7DWRR) and Shaping

SPSP

Each queue support max rate shaping and WTD or WRED for congestion avoidance

Manages bandwidth by scheduling with SP and DWRR, and by maximum rate shaping

Green

Green

Green

Yellow

High priority

Middle priority

Low priority

Page 7 © NEC Corporation 2011 NEC Confidential

Presentation: Yes

Submission : Yes Egress Scheduling and Shaping (8 classes queue)

Class 7

Class 6

Class 3

Class 0

DWRR

SP

Weighted Round Robin according to amount of data

Drops lower priority packet, and divides bandwidth except SP by DWRR

absolute priority

Mapping to class queue

After absolute priority traffic is empty, remain priority traffic is transmitted.

Shaping(per port / per class)

Egress Scheduling (2SP+6DWRR) and Shaping

SPSP

Each queue support max rate shaping and WTD or WRED for congestion avoidance

Manages bandwidth by scheduling with SP and DWRR, and by maximum rate shaping

Green

Green

Green

Yellow

High priority

Middle priority

Low priority

Class 5

2nd highest priority