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IPv6 MulticastIPv6 MulticastMónica Domingues

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AgendaAgenda

• Introduction• Address allocation• IPv6 Multicast• Multicast Listener Discovery• Protocol Independent Multicast• Rendezvous-Point• Monitoring• Conclusions

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IntroductionIntroduction

• Reduces traffic by simultaneosly delivering a stream

• Multicast traffic is sent to a single address but processed by multiple hosts.

Source

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Address allocationAddress allocation

• IPv6 multicast addresses have the Format Prefix (FF)

• RFC 2373

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IPv6 multicastIPv6 multicast• How does it work?

– L2 Multicast• Deliver packets

– MLD (Multicast Listener Discovery)• Host registration

– Multicast Distribution Trees• Exchange routing information

– PIM (Protocol-independent multicast)• Exchange routing information

– BGMP (Border Gateway Multicast Protocol)• Forward between domains

– RPF (Reverse path forwarding)• Forward multicast

Host

Source

tow

ards

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Multicast Listener DiscoveryMulticast Listener Discovery

• Host have to register in groups in order to receive traffic

• MLD is used to dynamically register individual hosts in a multicast group

Host Host

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Protocol Independent MulticastProtocol Independent Multicast

• Uses the unicast routing table to perform the reverse path forwarding:– RIP– OSPF– BGP– Any…

• Types of PIM– Dense mode– Sparse mode– Source specific multicast– Bi-directional

Source Receiver

(S,G) Join (S,G) Join MLDv2Report

RP

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RendezVous-PointRendezVous-Point

• Static– Manual configuration

• Auto-RP– RP mapping agent

• Bootstrap Router (BSR)– Candidate-RP per domain

• Embedded RP– Multicast address includes encoded RP address– Interdomain and Intradomain solution

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MonitoringMonitoring

• Multicast beacon

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ApplicationsApplications

– Video/audio conferencing

– Broadcast TV

– Video-on-demand

– Radio Broadcast

– Resource discovery/Service advertisement

– Software update

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ConclusionsConclusions

• Way of sending same data to multiple

receivers

• Better bandwidth utilization

• Lesser host/router processing

• Receiver’s addresses unknown

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QUESTIONS