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Enabling SSM mapping
Follow these steps to enable the IGMP SSM mapping feature:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type interface-
number
—
Enable the IGMP SSM
mapping feature
igmp ssm-mapping enable
Required
Disabled by default
NOTE:
To ensure SSM service for all hosts on a subnet, regardless of the IGMP version running on the hosts,
enable IGMPv3 on the interface that forwards multicast traffic onto the subnet.
Configuring SSM mappings
You can map a multicast group to different multicast sources by performing this configuration repeatedly.
Follow these steps to configure an IGMP SSM mapping:
To do… Use the command… Remarks
Enter system view system-view —
Enter public network IGMP
view or VPN instance IGMP
view
igmp [ vpn-instance vpn-instance-name ] —
Configure an IGMP SSM
mapping
ssm-mapping group-address { mask |
mask-length } source-address
Required
No IGMP mappings are
configured by default.
CAUTION:
If IGMPv3 is enabled on a VLAN interface, and if a port in that VLAN is configured as a simulated
host, the simulated host will send IGMPv3 reports even if you did not specify a multicast source when
configuring simulated joining with the igmp-snooping host-join command. In this case, the
corresponding multicast group will not be created based on the configured IGMP SSM mappings. For
more information about the igmp-snooping host-join command, see the
IP Multicast Command
Reference
.
Configuring IGMP proxying
Configuration prerequisites
Before you configure the IGMP proxying feature, complete the following tasks:
• Configure any unicast routing protocol so that all devices in the domain are interoperable at the
network layer
• Enable IP multicast routing
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