What is multicast IP source specific multicast?

4.4 PIM 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.

Why are the source specific multicast addresses required?

By so limiting the source, SSM reduces demands on the network and improves security. SSM requires that the receiver specify the source address and explicitly excludes the use of the (*,G) join for all multicast groups in RFC 3376, which is possible only in IPv4’s IGMPv3 and IPv6’s MLDv2.

How do I find multicast addresses?

Multicast addresses are identified by the pattern “1110” in the first four bits, which corresponds to a first octet of 224 to 239. So, the full range of multicast addresses is from 224.0. 0.0 to 239.255. 255.255.

How are multicast addresses assigned?

Multicasting has its own Class D IP addressing scheme, controlled and assigned by the Internet Assigned Numbers Authority (IANA). This means that all IP multicasts are in the range of 224.0. 0.0 to 239.255.

Are multicast addresses unique?

Multicast Address Fundamentals Multicast sources and RPs (Rendezvous Points) are identified by their unique unicast address as a prerequisite. Multicast group addresses can be shared; for instance, many sources can send to the same address.

Can we ping multicast address?

You can only ping, via multicast, hosts which are subscribed to the multicast group which you are pinging. You need to be careful about which multicast groups you use, and, in general, you should use multicast groups from the administratively scoped range of 239.0.

What are Unicast addresses?

A unicast address is an address that identifies a unique node on a network. Unicast addressing is available in IPv4 and IPv6 and typically refers to a single sender or a single receiver, although it can be used in both sending and receiving. Unicast is the most common form of IP addressing.

Which is the source specific multicast IP address?

Source-Specific Multicast (SSM) Range is the Multicast addresses between 232.0.0.0 and 232.255.255.255. These multicast addresses are used for Source-Specific Multicast (SSM) Applications and Protocols. SSM provide an efficient multicast routing with its mechanism. Because, with SSM, host can select the Multicast Group that it get traffic.

How does source-specific multicast work for SSM?

Source-specific multicast delivery semantics are provided for a datagram sent to an SSM address. That is, a datagram with source IP address S and SSM destination address G is delivered to each upper- layer “socket” that has specifically requested the reception of datagrams sent to address G by source S, and only to those sockets.

How is multicast traffic conveyed from a specific source?

Interest in multicast traffic from a specific source is conveyed from hosts to routers using IGMPv3 as specified in RFC 4607. SSM destination addresses must be in the ranges 232.0.0.0/8 for IPv4. For IPv6 current allowed SSM destination addresses are specified by ff3x::/96, where the hexadecimal digit x represents the scope.

How does a multicast network discover all sources?

The multicast network must discover all multicast sources sending to that address, and route data from all sources to all interested receivers. This behavior is particularly well suited to groupware applications where all participants in the group want to be aware of all other participants, and