Why is multicast protocols designed in Layer 3 when routing protocols in L5
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Would like to know why multicast routing protocols (PIM-SM or DVMRP) are designed to be in Layer3 when routing protocols (RIP or OSPF) reside in Layer 5?
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Basic simple routing takes place at layer 3 (the IP layer). RIP and OSPF are protocols that require routers to communicate amongst each other (they implement various routing algorithms). This communication takes place over standard IP layer 3. Therefore there must be some facility available in layer 3 to handle broadcast and multicast traffic for routing and various other functions.
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Why is multicast protocols designed in Layer 3 when routing protocols in L5
