What is multicast IP source specific multicast?

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.

How does SSM multicast work?

In SSM, multicast traffic from each individual source will be transported across the network only if it was requested (through IGMPv3, IGMP v3lite, or URD memberships) from a receiver. In contrast, ISM forwards traffic from any active source sending to a multicast group to all receivers requesting that multicast group.

What is the multicast address range?

224.0.0.0 to 239.255.255.255
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. 255.255.

What is IGMP snooping in router?

IGMP snooping is the process of listening to Internet Group Management Protocol (IGMP) network traffic to control delivery of IP multicasts. Network switches with IGMP snooping listen in on the IGMP conversation between hosts and routers and maintain a map of which links need which IP multicast transmission.

What is IPv4 multicast address?

IPv4. IPv4 multicast addresses are defined by the most-significant bit pattern of 1110. This originates from the classful network design of the early Internet when this group of addresses was designated as Class D. The CIDR notation for this group is 224.0.

Which multicast address group is dedicated to be used exclusively for spts for SSM?

255.255 (232/8) is the Source Specific Multicast Block, which is reserved for (oddly enough) Source Specific Multicast. SSM is a new extension to PIM-SM that eliminates the need for the RP and the Shared Tree and only uses the SPT to the desired source(s).

Which of the following two addresses are multicast addresses?

The multicast addresses are in the range 224.0. 0.0 through 239.255. 255.255.

How do I find a multicast address?

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.

Is IGMP snooping required for multicast?

Without IGMP Querying/Snooping, Multicast traffic is treated in the same manner as a Broadcast transmission, which forwards packets to all ports on the network. With IGMP Querying/Snooping, Multicast traffic is only forwarded to ports that are members of that Multicast group.

Should I turn on IGMP snooping?

When to Enable IGMP Snooping for Home Use For a home based network, you should enable it when you frequently use any kind of streaming or mirroring from your devices to stream to Apple TV or Chromecast. In some brand firmware such as Asus, enabling IGMP Snooping can fix some of the Apple TV Airplay mirroring issues.