[PPT] - iLab2 Introduction to Multicast and SIP Daniel Raumer PowerPoint Presentation

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Lehrstuhl Netzarchitekturen und Netzdienste

Institut für Informatik Technische Universität München

iLab2 – Introduction to Multicast and SIP

Daniel Raumer raumer@net.in.tum.de

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iLab2 – Introduction to the Multicast and SIP – Daniel Raumer– 2012-11-08

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Introduction

 Hands on Lab  Multicast – Who?  SIP - What?

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iLab2 – Introduction to the Multicast and SIP – Daniel Raumer– 2012-11-08

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Multicast – Why?

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iLab2 – Introduction to the Multicast and SIP – Daniel Raumer– 2012-11-08

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Multicast – Why?

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iLab2 – Introduction to the Multicast and SIP – Daniel Raumer– 2012-11-08

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Multicast – Who?

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iLab2 – Introduction to the Multicast and SIP – Daniel Raumer– 2012-11-08

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Multicast - Who

Football Worldcup 2010

Videostreams with1.5 MBit/s per User - and this is not hd ;-)
Continuously for up to 2 hours
180 000 concurrent streams in Germany
270 000 MBit/s or about 270 GBit/s

Provider Networks

500 User 1000 User 200 User

300 MBit/s 1500 MBit/s 750 MBit/s 2250 MBit/s 300 MBit/s 2550 MBit/s 2550 MBit/s

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2011 Example

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2011 Example

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2011 Example

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2011 Example

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2011 Example

 Vodafone Network: + 20,5 % Data Traffic 

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2011 Example

 Vodafone Network: + 20,5 % Data Traffic  Youtube Lifestream: 400 000 000 Viewers

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2011 Example

 Vodafone Network: + 20,5 % Data Traffic  Youtube Lifestream: 400 000 000 Viewers

Obama Inauguration 70 000 000 Viewers

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2011 Example

 Vodafone Network: + 20,5 % Data Traffic  Youtube Lifestream: 400 000 000 Viewers

Obama Inauguration 70 000 000 Viewers

 Akamai: 1 600 000 concurrent streans

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2011 Example

 Vodafone Network: + 20,5 % Data Traffic  Youtube Lifestream: 400 000 000 Viewers

Obama Inauguration 70 000 000 Viewers

 Akamai: 1 600 000 concurrent streans

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Multicast

Back in the old days of the Internet

1985 (2 years after switch day) -RFC 966 - A Multicast Extension to the

Internet Protocol

Paper Cheriton et al: “The extensive use of local networks is beginning to drive

requirements for internet facilities…”

1986 National Science Foundation: Largest Backbone: 56 kbit/s
1989 - RFC 1112 - Host Extensions for IP Multicasting

500 User 1000 User 200 User

1.5 MBit/s 1.5 MBit/s 1.5 MBit/s 1.5 MBit/s 1.5 MBit/s 1.5 MBit/s 1.5 MBit/s

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Multicast

500 User 1000 User 200 User 300 User 0 Users

1.5 MBit/s 1.5 MBit/s 1.5 MBit/s 1.5 MBit/s 1.5 MBit/s 1.5 MBit/s 1.5 MBit/s 1.5 MBit/s 0 MBit/s 0 MBit/s

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Multicast

 Efficient distribution of media data

Pushing data to the target networks
Not sending data if no recipients request the data
Reduce number of concurrent streams on a single link as far as possible
Usually 1 stream per network segement

 Dynamic Group Management

Group of receivers and senders
Set up groups
Maintain and Change groups
Discard Groups if not needed anymore

 Multicast has multiple protocols that are used  Multicast defines different modes to cope with different requirements

Many recipients
Few recipients

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And now for something completely different

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SIP – What?

 RFC 2543 – Session Initiation Protocol  Definition: “SIP – An application layer signalling protocol that defines

initiation modification and termination of interactive, multimedia communication sessions between users!“

 Current RFC 3261  Today used for

VoIP (mainly)
Instant Messaging (MSN)
Messaging systems often use SIMPLE  Simplified version of SIP
Online Games
Signalling Protocol for Next Generation Networks
All IP Networks (IP Multimedia Subsystem - IMS)

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SIP – What?

 RFC 2543 – Session Initiation Protocol  Definition: “SIP – An application layer signalling protocol that defines

initiation modification and termination of interactive, multimedia communication sessions between users!“

 Current RFC 3261

1996: First technology concept drafts 1999: RFC 2543 2000: SIP became signaling protocol in the 3GPP and element in IMS 2002: official IETF Standard …increase of application

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The Protocol

 Application Layer Protocol

Signaling Protocol for IP Networks opposed to PSTN SS7

 Text based – Similarities to HTTP

Uses similar status codes
200  OK
3xx  Moved
4xx  Errors

 RFC 3261 defines the Framework

Header fields
Protocol
What to do when
Which messages are sent at which point of the session
…
Additional RFCs complement this basic framework
Privacy (RFC 3323)
Compression (RFC 3320)
Body Content, Media Description…

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What does it do?

 Session Initiation  Localization of users

Using SIP URIs: ilab2@net.in.tum.de

 Presence indication  Negotiation of Parameters

Codecs to be used, Security Parameters

 Setup of the session

Media targets

 Management and maintenance of the session

Forwarding or cancelation of a session
Invite, re-Invites, …

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What it does NOT

 SIP is not a ready-for-use application

It is not Instant messaging, VoIP, or Video on demand.

 SIP does not transport media

but does work with Session Description Protocol (SDP)

 SIP does not provide QoS

but can work with Resource Reservation Protocol (RSVP) and Real-Time

Transport Protocol (RTP)

 SIP does not provide Authentication

but works with RADIUS and LDAP

 “SIP needs alphabet soup to stay healthy!”

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SIP Based VoIP Call

sip:bob@someplace Protocol / Negotiation Call Protocol / End Call

RTP Session

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Reinvitation

Sorry Bob is not here – Try mobile sip:bob@someplace sip:bobmobile@someplace

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SIP Based VoIP Call

Jamai.ca Furni.er

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Content of the Lab

 Hands on Lab – No coding included  Multicast – Media Distribution

Set it up, watch the things it does
Compare to other types of media distribution

 SIP for VoIP

Analysis of traffic flows in typical scenarios

 Combined SIP and Multicast

Protocol analysis of an application that makes use of SIP and Multicast!