Users Guide

Table Of Contents
PIM-SSM uses IGMPv3 because receivers subscribe to a source and group, the RP and shared tree are unnecessary; only
SPTs are used. On OS10 systems, it is possible to use PIM-SM with IGMPv3 to achieve the same result, but PIM-SSM
eliminates the unnecessary protocol overhead.
Configure PIM-SSM
To configure a group range for PIM-SSM:
NOTE: The IP range, 232.0.0.0/8 is reserved for SSM. You do not have to explicitly configure this range.
1. Create an ACL rule to specify the range of addresses that should use SSM.
OS10# configure terminal
OS10(config)# ip access-list ssm-1
OS10(config-ipv4-acl)# permit ip any 236.0.0.0/8
OS10(config-ipv4-acl)# exit
2. Enable PIM-SSM for the range of addresses using the ip pim ssm-range command.
OS10(config)# ip pim ssm-range ssm-1
You can use the show ip pim ssm-range command to view the groups added in PIM-SSM configuration.
OS10# show ip pim ssm-range
Group Address / MaskLen
236.0.0.0 / 8
PIM-SSM sample configuration
This section describes how to enable PIM-SSM using the topology show in the following illustration.
To enable PIM-SSM, perform the following configurations on R1 and R2:
Sample configuration on R1:
R1# configure terminal
R1(config)# ip vrf red
R1(conf-vrf)# end
R1# configure terminal
R1(config)# interface port-channel 11
R1(conf-if-po-11)# no switchport
R1(conf-if-po-11)# ip vrf forwarding red
R1(conf-if-po-11)# end
R1# configure terminal
R1(config)# interface ethernet 1/1/6
R1(conf-if-eth1/1/6)# no ip vrf forwarding
R1(conf-if-eth1/1/6)# no switchport
R1(conf-if-eth1/1/6)# channel-group 11
R1(conf-if-eth1/1/6)# end
R1# configure terminal
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Multicast