Configuring the SSM group range
About the SSM-group range
When a PIM-SM enabled interface receives a multicast packet, it checks whether the multicast group address of the packet is in the SSM group range. If the multicast group address is in this range, the PIM mode for this packet is PIM-SSM. If the multicast group address is not in this range, the PIM mode is PIM-SM.
Restrictions and guidelines
Configure the same SSM group range on all devices in the entire PIM-SSM domain. Otherwise, multicast information cannot be delivered through the SSM model.
When a member of a multicast group in the SSM group range sends an IGMPv1 or IGMPv2 report message, the device does not trigger a (*, G) join.
Procedure
Enter system view.
system-view
Enter PIM view.
pim
Configure the SSM group range.
ssm-policy ipv4-acl-number
By default, the SSM group range is 232.0.0.0/8.