Information About Ssm And Ssm Mapping; Ssm Components Overview; How Ssm Differs From Internet Standard Multicast - Cisco Catalyst 3850 series Configuration Manual
Ip multicast routing configuration guide
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Also See for Catalyst 3850 series:
- Configuration manual (58 pages) ,
- Hardware installation manual (146 pages)
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Configuring SSM
The following are the restrictions for configuring SSM mapping:
• The SSM Mapping feature does not share the benefit of full SSM. SSM mapping takes a group G join
• Enable IGMPv3 with care on the last hop router when you rely solely on SSM mapping as a transition
Information About SSM and SSM Mapping
SSM Components Overview
SSM is a datagram delivery model that best supports one-to-many applications, also known as broadcast
applications.
SSM is a core networking technology for Cisco's implementation of IP multicast solutions targeted for audio
and video broadcast application environments and is described in RFC 3569. The following components
together support the implementation of SSM:
• Protocol Independent Multicast source-specific mode (PIM-SSM)
• Internet Group Management Protocol Version 3 (IGMPv3)
Protocol Independent Multicast (PIM) SSM, or PIM-SSM, is the routing protocol that supports the
implementation of SSM and is derived from PIM sparse mode (PIM-SM). IGMP is the Internet Engineering
Task Force (IETF) standards track protocol used for hosts to signal multicast group membership to routers.
IGMP Version 3 supports source filtering, which is required for SSM. IGMP For SSM to run with IGMPv3,
SSM must be supported in the router, the host where the application is running, and the application itself.
Related Topics
Configuring Source Specific Multicast, on page 267
SSM with IGMPv3 Example, on page 280
How SSM Differs from Internet Standard Multicast
The standard IP multicast infrastructure in the Internet and many enterprise intranets is based on the PIM-SM
protocol and Multicast Source Discovery Protocol (MSDP). These protocols have proved to be reliable,
extensive, and efficient. However, they are bound to the complexity and functionality limitations of the Internet
Standard Multicast (ISM) service model. For example, with ISM, the network must maintain knowledge about
which hosts in the network are actively sending multicast traffic. With SSM, this information is provided by
receivers through the source addresses relayed to the last-hop devices by IGMPv3. SSM is an incremental
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a source is active, the network must maintain the (S, G) state in PIM-SSM as long as receivers are
requesting receipt of that channel.
from a host and identifies this group with an application associated with one or more sources, therefore,
it can only support one such application per group G. Nevertheless, full SSM applications may still share
the same group also used in SSM mapping.
solution for full SSM. When you enable both SSM mapping and IGMPv3 and the hosts already support
IGMPv3 (but not SSM), the hosts send IGMPv3 group reports. SSM mapping does not support these
IGMPv3 group reports, and the router does not correctly associate sources with these reports.
IP Multicast Routing Configuration Guide, Cisco IOS XE Release 3.6E (Catalyst 3850 Switches)
Information About SSM and SSM Mapping
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