PIM-SSM definition
PIM-SSM, short for Protocol Independent Multicast - Source-Specific Multicast, is a multicast routing protocol used in coordinating the efficient delivery of internet protocol (IP) multicast streams. As the name implies, PIM-SSM is independent of the underlying topology and relies exclusively on the source address. It only forwards packets from the pre-designated source to the receivers explicitly requesting the data.
See also: internet protocol address, TCP handshake
PIM-SSM examples
- Video conferencing: PIM-SSM is often used to distribute live streams, such as video conferencing, across a network without duplicating the data stream.
- IPTV broadcasting: Internet service providers (ISPs) use PIM-SSM to distribute television services over their networks efficiently.
Advantages and disadvantages of PIM-SSM
Pros:
- Efficiency: PIM-SSM provides efficient network utilization by ensuring that multicast data only goes to receivers explicitly requesting it.
- Control: It allows tighter control of sources, making it more difficult for unauthorized sources to hijack multicast groups.
Cons:
- Complexity: Implementing PIM-SSM requires certain network configurations and the knowledge to manage them.
Using PIM-SSM
- Ensure your network infrastructure supports multicast and has been correctly configured for PIM-SSM.
- Be aware of the sources of your data streams to prevent unauthorized access.
