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IGMP - Internet Group Management Protocol is used by hosts and
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routers to tell each other about group membership.
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PIM-SM - Protocol Independent Multicast-Sparse Mode is used to
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propagate forwarding state between routers.
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SSM - Source Specific Multicast utilizes a subset of PIM’s
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functionality to guaranty source-only trees in the 232/8 range.
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MBGP - Multiprotocol Border Gateway Protocol is used to
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exchange routing information for interdomain RPF
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checking.
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MSDP - Multicast Source Discovery Protocol is used to exchange
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ASM active source information between RPs.
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