Configuring IGMP-SSM Mapping

To support PIM-SSM for IGMPv1 and IGMPv2 clients, a PIM-SSM range must be configured, and that range should include all groups to which the clients want access. If IGMPv1 and IGMPv2 clients request group addresses outside the PIM-SSM range, those addresses are ignored by PIM-SSM and forwarded to PIM as (*, G) requests.