Configuring Source-Specific Multicast; Ssm Components Overview - Cisco 3845 - Security Bundle Router Software Manual

Chapter 33 Configuring IP Multicast Routing
Switch(config-if)# exit
Switch(config)# interface GigabitEthernet0/20
Switch(config-if)# ip pim passive
Switch(config-if)# exit
Switch(config)# interface vlan100
Switch(config-if)# ip address 100.1.1.1 255.255.255.0
Switch(config-if)# ip pim passive
Switch(config-if)# exit
Switch(config)# interface GigabitEthernet0/20
Switch(config-if)# no switchport
Switch(config-if)# ip address 10.1.1.1 255.255.255.0
Switch(config-if)# ip pim passive
Switch(config-if)# end
To verify that PIM stub is enabled for each interface, use the show ip pim interface privileged EXEC
command:
Switch# show ip pim interface
Address Interface Ver/ Nbr Query DR DR
Mode Count Intvl Prior
3.1.1.2 GigabitEthernet0/25 v2/SD 1 30 1 3.1.1.2
100.1.1.1 Vlan100 v2/P 0 30 1 100.1.1.1
10.1.1.1 GigabitEthernet0/20 v2/P 0 30 1 10.1.1.1
Use these privileged EXEC commands to display information about PIM stub configuration and status:
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Configuring Source-Specific Multicast

This section describes how to configure source-specific multicast (SSM). For a complete description of
the SSM commands in this section, refer to the "IP Multicast Routing Commands" chapter of the
IOS IP Command Reference, Volume 3 of 3:
appear in this chapter, use the command reference master index, or search online.
The SSM feature is an extension of IP multicast in which datagram traffic is forwarded to receivers from
only those multicast sources that the receivers have explicitly joined. For multicast groups configured
for SSM, only SSM distribution trees (no shared trees) are created.

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 the Cisco implementation of IP multicast
solutions targeted for audio and video broadcast application environments. The switch supports these
components that support the implementation of SSM:
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OL-23400-01
show ip pim interface displays the PIM stub that is enabled on each interface.
show ip igmp detail displays the interested clients that have joined the specific multicast source
group.
show ip igmp mroute verifies that the multicast stream forwards from the source to the interested
clients.
Protocol independent multicast source-specific mode (PIM-SSM)
PIM-SSM is the routing protocol that supports the implementation of SSM and is derived from PIM
sparse mode (PIM-SM).
Internet Group Management Protocol version 3 (IGMPv3)
Multicast. To locate documentation for other commands that
Cisco ME 3800X and 3600X Switch Software Configuration Guide
Configuring IP Multicast Routing
Cisco
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