Is Protocol Independent Multicast (PIM) really Protocol Independent? What is that dependency? Does PIM require an IP or can it work with non-IP?
One of my students asked, is PIM require an IP (Internet Protocol), which triggered me to share the answer with you.
PIM uses unicast routing for loop prevention, creating Tree (Shared or Source Based Tree), and send Join and Prune messages towards to Source of the Tree (Either Sender or RP), as you will understand when you read the above blog posts on the website.
In terms of routing protocol, any unicast routing protocol can be used by PIM. In contrast to early successor of PIM, which is DVMRP (Distance Vector Multicast Routing Protocol), PIM can use link state, path vector or distance vector routing protocol for all of the above protocol functions.
Thus, to be precise, PIM is “unicast routing protocol independent,” as compared to DVMRP.
But on the other side, PIM is very much bound up with the IP (Internet Protocol)—it is not protocol independent in terms of network-layer protocols.
As a summary, PIM (Protocol Independent Multicast) requires IP in Layer 3, but can use any unicast routing protocol (Not like Multicast OSPF or DVMRP) for the tree formation, loop prevention, join and prune messages to receive or not to receive multicast packet.
Thanks for Naresh Kumar Pendem to send a message for the typo mistake correction ‘ Loop preservation > Loop Prevention ‘.
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Orhan Ergun, CCIE/CCDE Trainer, Author of Many Networking Books, Network Design Advisor, and Cisco Champion 2019/2020/2021
He created OrhanErgun.Net 10 years ago and has been serving the IT industry with his renowned and awarded training.
Wrote many books, mostly on Network Design, joined many IETF RFCs, gave Public talks at many Forums, and mentored thousands of his students.
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