H3C Technologies H3C S10500 Series Switches - Manual (Page 128)

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Configuring IGMP SSM mapping
Because of some possible restrictions, some receiver hosts on an SSM network might run IGMPv1 or
IGMPv2. To provide SSM service support for these receiver hosts, configure the IGMP mapping feature
on the last-hop router.
Configuration prerequisites
Before you configure the IGMP SSM mapping feature, complete the following tasks:
• Configure any unicast routing protocol so that all devices in the domain are interoperable at the
network layer
• Configure basic functions of IGMP
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
By performing this configuration multiple times, you can map a multicast group to different multicast
sources.
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.