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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 40 Configuring IP Multicast Routing
Configuring IP Multicast Routing
Monitoring SSM
Use the commands in Table 40-3 to monitor SSM.
Configuring Source Specific Multicast Mapping
The Source Specific Multicast (SSM) mapping feature supports SSM transition when supporting SSM
on the end system is impossible or unwanted due to administrative or technical reasons. You can use
SSM mapping to leverage SSM for video delivery to legacy STBs that do not support IGMPv3 or for
applications that do not use the IGMPv3 host stack.
This section covers these topics:
• Configuration Guidelines, page 40-17
• SSM Mapping Overview, page 40-18
• Configuring SSM Mapping, page 40-19
• Monitoring SSM Mapping, page 40-22
Configuration Guidelines
These are the SSM mapping configuration guidelines:
• Before you configure SSM mapping, enable IP multicast routing, enable PIM sparse mode, and
configure SSM. For information on enabling IP multicast routing and PIM sparse mode, see the
“Default Multicast Routing Configuration” section on page 40-8.
• Before you configure static SSM mapping, you must configure access control lists (ACLs) that
define the group ranges to be mapped to source addresses. For information on configuring an ACL,
see
Chapter 31, “Configuring Network Security with ACLs.”
• Before you can configure and use SSM mapping with DNS lookups, you must be able to add records
to a running DNS server. If you do not already have a DNS server running, you need to install one.
You can use a product such as Cisco Network Registrar. Go to this URL for more information:
http://www.cisco.com/warp/public/cc/pd/nemnsw/nerr/index.shtml
These are the SSM mapping restrictions:
• The SSM mapping feature does not have all the benefits of full SSM. Because SSM mapping takes
a group join from a host and identifies this group with an application associated with one or more
sources, it can only support one such application per group. Full SSM applications can still share
the same group as in SSM mapping.
Ta ble 40-3 Monitoring SSM
Command Purpose
show ip igmp groups detail Display the (S, G) channel subscription through IGMPv3.
show ip mroute Display whether a multicast group supports SSM service or
whether a source-specific host report was received.