What is 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 SSM in networking?

Source-specific multicast (SSM) is a method of delivering multicast packets in which the only packets that are delivered to a receiver are those originating from a specific source address requested by the receiver. By so limiting the source, SSM reduces demands on the network and improves security.

What are multicast addresses used for?

A multicast address is a logical identifier for a group of hosts in a computer network that are available to process datagrams or frames intended to be multicast for a designated network service.

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.

Is multicast UDP?

Note: multicast uses UDP and are sent through switches and hubs. To receive a multicast message a host must be configured to receive on that multicast address. All hosts that are configured to receive packets on a particular address are part of a multicast group.

What is a valid multicast address?

So, the full range of multicast addresses is from 224.0. 0.0 to 239.255. 255.255. Since multicast addresses represent a group of IP devices (sometimes called a host group) they can only be used as the destination of a datagram; never the source.

Can a multicast address be a source address?

A packet sent to a multicast group always has a unicast source address. A multicast address can never be the source address. Unlike IPv4, there is no broadcast address in IPv6. Instead, IPv6 uses multicast, including an all-IPv6 devices well-known multicast address and a solicited-node multicast address.

What do you need to know about source specific multicast?

Using sparse mode our receivers require the RP (Rendezvous Point) to discover new sources in the network. SSM (Source Specific Multicast) requires IGMPv3 and lets us join multicast groups from specified source addresses. Besides just joining any group, the receiver is able to receive the group from a specified source.

Which is the multicast address range for SSM?

SSM provide an efficient multicast routing with its mechanism. Because, with SSM, host can select the Multicast Group that it get traffic. GLOP Block Range is the Multicast addresses between 233.0.0.0 and 233.255.255.255.These Multicast address block can be used by the companies that has registered Autonomous System Number (ASN).

What are the IPv4 multicast group addresses?

The Multicast Source adresses uses normal addresses. For example for IPv4, Multicast Group Addresses and the Multicast Source Let’s see these both of these Multicast Addresses. You can also visit Multicat MAC Address Lesson. IPv4 Multicast Addresses are the D Class IPv4 addresses between 224.0.0.0 and 239.255.255.255.