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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.
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 IGMP functions.
Enabling SSM mapping
Ste
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable the IGMP SSM
mapping feature.
igmp ssm-mapping enable
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.
If IGMPv3 is enabled on a VLAN interface of a switch, 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 you configure 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 IP Multicast Command Reference.
To configure an IGMP SSM mapping:
Ste
Remarks
1. Enter system view.
system-view N/A
2. Enter IGMP view.
igmp N/A
3. Configure an IGMP SSM
mapping.
ssm-mapping group-address { mask |
mask-length } source-address
No IGMP mappings are
configured by default.
Configuring IGMP proxying
Before you configure the IGMP proxying feature, complete the following tasks:
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