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Tudor Mihai BLAGA – Alternative Solutions toward IPv4/IPv6 MulticastBaile Felix Spa, June 1-3, 2006 1

Tudor Mihai Blaga, V. Dobrota, G. Lazar & B. MoraruTechnical University of Cluj-Napoca, Romania E-mail: {tudor.blaga, virgil.dobrota, gabriel.lazar, bogdan.moraru}

@com.utcluj.ro

Alternative Solutions toward IPv4/IPv6 Multicast

2Tudor Mihai BLAGA – Alternative Solutions toward IPv4/IPv6 MulticastBaile Felix Spa, June 1-3, 2006

Agenda

I. IntroductionII. Alternative Multicast Technologies:

CastGateIII.Proposed Improvements

I. Receiving MulticastII. Sending MulticastIII. IPv6 CastGate

IV. Conclusion


I. Introduction


Introduction

Point-to-multipoint communicationMultimedia content streaming – MULTICASTLack of multicast deployment:

technical reasons (high complexity)marketing reasons (no customers)

Group management – IGMP Internet Group Management ProtocolNative multicast creates distribution trees:

PIM (Protocol Independent Multicast)DVMRP, MOSPF, CBT

AGCS – Alternative Group Communication Service


II. CastGate

CastGate ClientCastGate Router


CastGate

CastGate:transition technologyseamless access to multicastbased on Enhanced UMTP (UDP Multicast Tunneling Protocol)

CastGate architecture:CastGate Tunnel ClientCastGate Tunnel ServerCastGate Tunnel Database Server

CastGate RouterCastGate ClientIGMP Querier


CastGate Client

TunnelDatabase

Server

TunnelServer

MulticastInternet

UnicastInternet

UMTP Tunnel

UMTP Tunnel

UMTP Tunnel

End Host

CastGateTunnelClient

End Host

End Host




CastGate Router

TunnelServer

MulticastInternet

UnicastInternet

UMTP TunnelEnd Host

CastGateRouter

End Host

End Host

UnicastRouter


III. Proposed Improvements

CastGate Router with PIM-SM


Proposed Improvements

Provide multicast access – entire local domainLocal domain = group of networks with multicast capabilities (multicast routing protocol), no global multicast accessPIM-SM (Sparse Mode)

shared root RP (Rendezvous Point)

RP-on-a-stick a single PIM-SM interfaceincoming interface of (S, G) entryoutgoing interface on the shared tree for group G

CastGate Router + partial PIM-SM functionality


CastGate with PIM-SM


Receiving multicast

PIM-SM module:capture messages destined to RPJoin/Prune (*, G) messages“join” group G through the tunnelmodified version of downstream per-interface (*, G) state machine from PIM-SM protocol specification

Machine states:NoInfo (NI)Join (J)Prune-Pending (PP)


Receiving multicast


Sending multicast

PIM-SM module:capture PIM Register messages, (S, G) informationdiscard Null-Register messagessend Hello messages !! DR election !!send Join (*, G) messagesstate machine for forwarding multicast traffic through tunnel

Machine states:NoInfo (NI)Join (J)


Sending multicast


IPv6 CastGate

CastGate used for transition to IPv6Scenarios:

IPv6 multicast tunneled over IPv4 CastGateIPv6 multicast tunneled over IPv6 CastGate

CastGate architecture modifications:IPv6 Enhanced UMTP

12-octet trailer replaced by 24-octet trailer16-octet trailer replaced by 40-octet trailer

IPv6 capable Tunnel ClientIPv6 capable Tunnel Serverno modification needed for Tunnel Database Server


IV. Conclusion


Conclusion

AGCS – CastGate:existing solution: CastGate Client, CastGate Routerenhancement: CastGate Router with PIM-SM

IPv6 CastGate for transition to native IPv6 multicastFinal solution is multicastFurther work:

possible generalization to other AGCS technologiesperformance evaluationsuitable metrics for AGCS technologies and native multicast


Thank you!

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