Source Specific Multicast
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 for the Cisco implementation 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 is indicating 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.
Additional References
Related Documents
Document TitleRelated Topic
Cisco IOS IP Multicast Command Reference
IP multicast commands: complete command syntax,
command mode, command history, defaults, usage
guidelines and examples
IP Multicast Routing Command Reference (Catalyst
3850 Switches)
For complete syntax and usage information for the
commands used in this chapter.
MIBs
MIBs LinkMIB
To locate and download MIBs for selected platforms,
Cisco IOS releases, and feature sets, use Cisco MIB
Locator found at the following URL:
http://www.cisco.com/go/mibs
--
RFCs
TitleRFC
Host Extensions for IP MulticastingRFC 1112
IP Router Alert OptionRFC 2113
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
28 OL-32598-01
IP Multicast Routing Technology Overview
Additional References
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