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3-5.6 IPv4 SSM
Information
Source Specific Multicast (SSM) is a datagram delivery model that best supports one-
to-many applications, also known as broadcast applications. SSM is a core network
technology of IP multicast targeted for audio and video broadcast application
environments.
For the SSM delivery mode, an IP multicast receiver host must use IGMP Version 3
(IGMPv3) to subscribe to channel (S, G). By subscribing to this channel, the receiver
host indicates that it wants to receive IP multicast traffic sent by source host S to
group G. The network will deliver IP multicast packets from source host S to group G
to all hosts in the network that have subscribed to the channel (S, G).
SSM does not require group address allocation within the network, only within each
source host. Different applications running on the same source host must use
different SSM groups. Different applications running on different source hosts can
arbitrarily reuse SSM group addresses without causing any excess traffic on the
network.
Addresses in the range 232.0.0.0/8 (232.0.0.0 to 232.255.255.255) are reserved for
SSM by IANA. In the switch, you can configure SSM for arbitrary IP multicast
addresses also.
Web Interface
To display the IGMPv3 IPv4 SSM Information in the web interface:
1.
Click Configuration, IGMP Snooping, then IPv4 SSM Information.
2.
If you want to auto-refresh the information, then you need to evoke the
“Auto-refresh”.
3.
Click “Refresh” to refresh an entry of the IGMPv3 IPv4 SSM Information.
4.
Click “<< or >>” to move to previous or next entry.
Figure 3-6.6: The IGMPv3 IPv4 SSM Information.