MOSPF vs OSPF: Source and Destination Impact

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The discussion centers on the differences between MOSPF (Multicast Open Shortest Path First) and its unicast counterpart, OSPF. The key point highlighted is that MOSPF considers both the source and destination in its routing decisions, while OSPF primarily focuses on the destination. This distinction is crucial because, in multicast routing, each node must create a unique distribution tree for each source to ensure accurate packet delivery and prevent loops. The technical complexity of this topic suggests that further exploration in specialized networking forums may be beneficial for deeper understanding.
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In the Rfc about MOSPF, is declared that one difference between this alghortim an his "unicast version" OSPF that, while in the former what is important is both the source and the destination, in OSPF what is fundamental is just the destination.
Why this statement, if in both case source is the initial point where shortest path begins?
Thanks in advance.
 
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kususe said:
In the Rfc about MOSPF, is declared that one difference between this alghortim an his "unicast version" OSPF that, while in the former what is important is both the source and the destination, in OSPF what is fundamental is just the destination.
Why this statement, if in both case source is the initial point where shortest path begins?
Thanks in advance.

Honestly I think you are better off finding a Cisco/Network forum as this question is fairly technical.
 
In multicast routing each node has to form a distribution tree based on the source node. The tree is unique to each source node, so that a node receiving a multicast packet knows exactly which all node have received the packet and exactly where to forward the packet. Or loops could form.
 

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