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A Generic Feedback Redirection Service for Reliable Multicast Protocols - PowerPoint PPT Presentation


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A Generic Feedback Redirection Service for Reliable Multicast Protocols. Jaiwant Mulik Department of Computer and Information Sciences Temple University. The Feedback Implosion Problem. 1. THIS DOES NOT SCALE. SOURCE. 3. 2. 4. 6. 7. 5. 0. 8. 7. 9. ASSUME ALL ROUTERS HAVE HOST

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Presentation Transcript
slide1

A Generic Feedback Redirection Service for

Reliable Multicast Protocols

Jaiwant Mulik

Department of Computer and Information Sciences

Temple University

slide2

The Feedback Implosion Problem

1

THIS DOES NOT SCALE

SOURCE

3

2

4

6

7

5

0

8

7

9

ASSUME ALL ROUTERS HAVE HOST

ATTACHED

slide3

Lightweight Multicast Service (LMS) solution to feedback implosion problem

JUST ONE "NACK"

1

SOURCE

ROUTER 2 HAS LINK TO

ROUTER 5 AS ITS REPLIER LINK

3

2

4

6

7

5

0

8

7

9

ROUTER 6 HAS LINK TO ROUTER 0

AS ITS REPLIER LINK

slide4

Motivation for a GENERIC Service

LOSS RECOVERY TECHNIQUES

END TO END

ROUTER ASSIST

(SRM,RMTP)

(PGM, LMS)

These use timers to suppress feedback

These aggregate feedback at routers

A TRANSPARENT GENERIC FEEDBACK REDIRECTION SERVICE COULD HELP

slide5

A Feedback Redirection Service for Reliable Multicast

1

SOURCE

3

2

4

6

7

5

0

Maintain Dynamic Repairer Identification here

8

7

9

slide6

Acquiring and Maintaining Repairer Identification Information

1

SOURCE

3

2

4

6

7

5

0

Maintain Dynamic Repairer Identification here

8

9

7

What feedback redirection information do we maintain ?

Where do we store it ?

How do we acquire and maintain it ?

How do we act on the replier identification information ?

slide7

Acquiring and Maintaining Repairer Identification Information

What feedback redirection information do we maintain ?

  • Interface Index List
  • Host list

Where do we store the replier identification information ?

  • Multicast Forwarding Cache
slide8

Acquiring and Maintaining Repairer Identification Information

How do we acquire it ?

1

SOURCE

  • Reactive
  • Proactive
  • Manual

3

2

4

6

7

5

0

8

7

9

How do we act on the replier identification information ?

slide9

Future Work

  • Simulation in NS-2
      • Recovery latency and bandwidth consumption comparison in SRM with and without the feedback redirection service
  • Analytical Modeling
  • Router Assist Services and Hacks (RASH)