- In PIM SSM, the Multicast Receiver Device must be manually configured with the Multicast Source IP and Group IP.
- PIM SSM must be enabled on all the devices in the Path between the Multicast Source and receiver.
config router multicast
set multicast-routing enable
config pim-sm-global
set ssm enable
end
end
- IGMPv1/IGMPv2 does not support PIM-SSM, so ensure that IGMPv3 is enabled on the FortiGate interface connected to the Multicast Receiver.
- Configure 'multicast-flow' for specific Multicast Source IP and group IP from where the receiver is expecting the Multicast Traffic.
- The Multicast-flow was originally introduced to control acceptable multicast traffic under the FortiGate interface connected to the multicast receiver.
- static-group configuration under the Interface connected to the Multicast Receivers only applies to cases where there is not any Multicast Receivers that are capable of joining the multicast stream using IGMP.
Basically, it is possible to use static-group only in the case there are not any IGMPv3-capable Multicast Receivers or for some other reason, to attract the multicast stream and forward it out on the interface where Multicast Receivers are connected. The FortiGate itself does not become a receiver for the Multicast stream.
Sample configuration on FortiGate connected to the Multicast Receiver:
config router multicast
set multicast-routing enable
config pim-sm-global
set ssm enable
end
config interface
edit <Interface_Connected_to_Receiver>
set pim-mode sparse-mode
set multicast-flow "11"
set static-group "11"
config igmp
set version 3
end
next
edit <Backbone_Interface>
set pim-mode sparse-mode
next
end
end
config router multicast-flow
edit "11"
config flows
edit 1
set group-addr <Multicast-Group-IP>
set source-addr <Multicast-Source-IP>
next
end
next
end
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