CERNET2 DVTS Experiences

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CERNET2 DVTS Experiences

Congxiao Bao

[email protected]

2006-10-31

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Outline

Introduction CERNET2 DVTS Experiences

– Configuration

– Data flow

– Reflector development

– User controlled testing tools

– Traffic monitoring

Lessons we learnt Remarks

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CERNET Video Experiences

•H.323 •AccessGrid •DVTS

•Easy •Easy if multicast ready•Easy if multicast ready •Not Easy

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CERNET2 Video Trial

• DVTS (30Mbps) - major application

• HDTV(27Mbps) - for VoD

• SDTV-uncompressed (200Mbps) - for interactive VC

• HDTV-uncompressed(1.2Gbps) - for telemedicine

• 3D DVTS(60Mbps) - for special demo

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Our Thinking

DVTS is an exciting and very useful application DVTS requires special network support (30Mbps,

single stream). If we can solve the DVTS transmission problem especially for inter-domain case, we can support other high performance application globally.

We can use CERNET2 to test large scale DVTS system .

DVTS is a very good point to start!

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CERNET2 DVTS Trial

Topology Node configuration Data flow Reflector development Traffic monitoring Website support User controlled testing tools

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• 25 DVTS nodes (diameter is about 1000+ kms)

• Bidirectional transmission

• 750MbpsDVTS

DVTS

DVTS

DVTS

DVTS

DVTS DVTS

DVTS DVTS

THU

XA

WH

HF

SJTU

GZ

CD

SY

TJ

CHQ

XM

NJ

LZ

DL

HABCHC

JN

HZCHS

ZZ

PKUBUPT

BUAA

FDU

TJU

DVTS DVTS DVTS

DVTS

DVTS

DVTS

DVTSDVTS

DVTS

DVTS

DVTSDVTS

DVTS

DVTS

DVTSDVTS

sender receiver

BJ

SH

CERNET2 DVTS Topology

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Node configuration— Ordinary Node (24pops)

Sender Receiver

CERNET2 backbone

From reflectorUniv.’s image

display

30Mbps 30Mbps

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Node configuration—Central Node (1)

R R RReflector

array

sender

switchGE

Multicast/unicast

T640

12 receivers 13 receiversbackup

CE

RN

ET

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THU sending

Reflector array

Each reflector receives

multicast/unicast stream from sender and converts to

12(13)unicast duplicated copies

to 25 different IPv6 hosts

distributed in 25 Pops

30Mx25=750Mbps

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Equipment Configuration— Central Node (2)

bj wh gz nj sh

xa cd sy tjn lzh

chq chs zhz hef jnn

xmn hzh dln chc hrb

pku bupt buaa fdu tju

Plasma displayarray

PCcluster

switchGE

30Mx25=750Mbps

PC clusterEach PC receives a

DVTS stream from one of the

25 Pops, respectively

T640

CERNET2

THU Receiving

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SJTU XJTU …… JLU

CERNET2

switch switch

……

…

…

北大

吉大 网管

DV

CERNET2 national Center THU

R R RGEGE

CERNET2 25 DVTS nodes

DVTS

sending PKU …… JLU

CERNET2

switch switch

……

…

…

PKU

JLU NMS

DV

THU( national center)

R R RGEGE

DVTS

sending

DVTS

receiving

DVTS

receiving

SJTU

Data Flow

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CERNET2 DVTS Video Wall

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Reflector Development

It runs on Linux OS and developed using g++ It supports IPv4 and IPv6 It supports Unicast and multicast (SSM and ASM) It can reflects 20+ streams with gigabit network

card It will be released as Open source very soon

source

reflector

reflector

reflector

SSSM multicast

unicast

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Network Traffic Monitoring

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Website Support

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User Controlled Testing Support

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Lessons We learnt (1) Large-scale DVTS is possible

– Network support 30 nodes for unicast (bandwidth limitation) Much more nodes for multicast

– End pc limitations completely interactive

Network monitoring integrated tools is very important for the administrator

– Isolate network problem and application problem

Self-service tools can dramatically increase the efficiency – User can do the test at any time– Open network and video performance info for users

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Lessons We Learnt (2)

Non-technique factors– Heavy load of coordination

POC list– Very difficult to do concurrent testing

Website– Standard configuration– Test reports release – Sharing info on common problem solving– Important notice

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Remarks Features of our system

– Pure IPv6 – Large scale– Multiple reflectors with multicast feeding– User controlled pre-test environment– Real time network traffic monitoring

We will present more technical details tomorrow

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Thank you!