Overview of Multicast Routing Protocol

• Routers can forward multicast packet by using
• dens-mode multicast routing protocol or
• sparse-mode multicast routing protocl

MULTICAST CONTROL PLANE

•  control plan used to
• who sent the traffic & to what groups
• who receiving traffic & for what groups
• how traffic should be forwarded when it received
• control plane built with a combination of
• Host to router communication (IGMP)
• Router to Router communication (PIM & MSDP)

MULTICAST ADDRESSING

• IPv4 multicast uses class D addresses
• 22.0.0.0/4 (224.0.0.0 - 239.255.255.255)
• divided into public multicast & some reserved ranges
• Reserved Ranges are:
• LINK-LOCAL ADDRESSES
• 22.0.0.0/24 (224.0.0.0 - 224.0.0.255
• SOURCE SPECIFIC MULTICAST
• 232.0.0.0 - 232.255.255.255
• ADMINISTRATIVELY SCOPED
• 239.0.0.0 - 239.255.255.255
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PE-CE routing with OSPF

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• Different routing protocols could be used between PE & CE.
• The PE-CE routing protocols run independently at every site.
• Redistribution of prefixes between MP-BGP routes PE-CE routing protocol.
• when using rip:
• when redistribute the MP-BGP routes into RIP. use
• redistribute bgp N metric metric {X|transperent}
• here N is AS number.
• X is the metric assigned to the RIP routes.
• if you are using the keyword transperent the rip metric will be recovered from RIP metric learned at the remote site.