What is multicast IP source specific multicast?
The Source Specific Multicast feature is an extension of IP multicast where datagram traffic is forwarded to receivers from only those multicast sources to which the receivers have explicitly joined.
What is difference between ASM and SSM?
In ASM, receivers express interest only in a given multicast group address. In contrast, with Source-Specific Multicast (SSM) the specific source(s) that may send traffic to the group are known in advance. In SSM, receivers express interest both in a given multicast address and specific associated source address(es).
What is IP PIM SSM?
PIM SSM uses the PIM sparse-mode functionality to create an SPT between the receiver and the source, but builds the SPT without the help of an RP. By default, the SSM group multicast address is limited to the IP address range from 232.0. 0.0 through 232.255. 255.255.
What is PIM SM protocol?
PIM Sparse Mode (PIM-SM) is a multicast routing protocol designed on the assumption that recipients for any particular multicast group will be sparsely distributed throughout the network. In other words, it is assumed that most subnets in the network will not want any given multicast packet.
How does SSM multicast work?
PIM source-specific multicast (SSM) uses a subset of PIM sparse mode and IGMP version 3 (IGMPv3) to allow a client to receive multicast traffic directly from the source. PIM SSM uses the PIM sparse-mode functionality to create an SPT between the receiver and the source, but builds the SPT without the help of an RP.
What is ASM and SSM in multicast?
ASM (Any-source Multicast) was defined by the original multicast RFC 1112. Source-Specific Multicasting (SSM) allows the multicast clients to specify the unicast source address also, from where it want to receive multicast traffic. Please note that source address and group address are different.
How does PIM SSM work?
Which multicast group is used for all PIM routers?
The join message is multicast hop by hop upstream to the ALL-PIM-ROUTERS group (224.0. 0.13) by means of each router’s RPF interface until it reaches the RP.
Is IGMPv3 backwards compatible with IGMPv2?
IGMPv3 supports source-specific join and leave messages and is backward compatible with IGMPv1 and IGMPv2.