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The Multicast Source Discovery Protocol (MSDP) describes a mechanism to connect multiple IP Version 4 Protocol Independent Multicast Sparse-Mode (PIM-SM) domains together. Each PIM-SM domain uses its own independent Rendezvous Point (RP) and does not have to depend on RPs in other domains.
https://tools.ietf.org/html/rfc3618
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Introduction
A Rendezvous Point (RP) is a router in a multicast network domain that acts as a shared root for a multicast shared tree. Any number of routers can be configured to work as RPs and they can be configured to cover different group ranges. For correct operation, every multicast router within a Protocol Independent Multicast (PIM) domain must be able to map a particular multicast group address to the same RP.
https://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ip-multicast/whitepaper_c11-508498.html
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meio forçado cobrar isso em concurso né, tá querendo que a galera chute é? pqp