1-25Use the display igmp ssm-mapping group command to view the multicast group information createdbased on the configured IGMP SSM mappings.# Display the IGMP multicast group information created based on the IGMP SSM mappings on SwitchD.[SwitchD] display igmp ssm-mapping groupTotal 1 IGMP SSM-mapping Group(s).Interface group report information of VPN-Instance: public netVlan-interface400(133.133.4.2):Total 1 IGMP SSM-mapping Group reportedGroup Address Last Reporter Uptime Expires232.1.1.1 133.133.4.1 00:02:04 offUse the display pim routing-table command to view the PIM routing table information on each switch.# Display the PIM routing table information on Switch D.[SwitchD] display pim routing-tableTotal 0 (*, G) entry; 2 (S, G) entry(133.133.1.1, 232.1.1.1)Protocol: pim-ssm, Flag:UpTime: 00:13:25Upstream interface: Vlan-interface104Upstream neighbor: 192.168.4.2RPF prime neighbor: 192.168.4.2Downstream interface(s) information:Total number of downstreams: 11: Vlan-interface400Protocol: igmp, UpTime: 00:13:25, Expires: -(133.133.3.1, 232.1.1.1)Protocol: pim-ssm, Flag:UpTime: 00:13:25Upstream interface: Vlan-interface103Upstream neighbor: 192.168.3.1RPF prime neighbor: 192.168.3.1Downstream interface(s) information:Total number of downstreams: 11: Vlan-interface400Protocol: igmp, UpTime: 00:13:25, Expires: -IGMP Proxying Configuration ExampleNetwork requirementsz PIM-DM is required to run on the core network. Host A and Host C in the stub network receive VODinformation destined to multicast group 224.1.1.1.z It is required to configure the IGMP Proxying feature on Switch B so that Switch B can maintaingroup memberships and forward multicast traffic without running PIM-DM.
