H3C Technologies H3C S12500 Series Switches - Manual (Page 113)

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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.
To configure an IGMP SSM mapping:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter public network
IGMP view or VPN
instance IGMP view. igmp [ vpn-instance vpn-instance-name ] 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:
• Configure any unicast routing protocol so that all devices in the domain are interoperable at the
network layer.
• Enable IP multicast routing.
Enabling IGMP proxying
You can enable IGMP proxying on the interface in the direction toward the root of the multicast
forwarding tree to make the device serve as an IGMP proxy.
Configuration guidelines
• Each device can have only one interface serving as the proxy interface. In scenarios with multiple
instances, IGMP proxying is configured on only one interface per instance.
• You cannot enable IGMP on an interface with IGMP proxying enabled. Moreover, only the igmp
require-router-alert, igmp send-router-alert, and igmp version commands can take effect on such
an interface.
• You cannot enable other multicast routing protocols (such as PIM-DM or PIM-SM) on an interface
with IGMP proxying enabled, or vice versa. However, the source-lifetime, source-policy, and
ssm-policy commands configured in PIM view can still take effect. In addition, in IGMPv1, the
designated router (DR) is elected by the working multicast routing protocol (such as PIM) to serve as
the IGMP querier. Therefore, a downstream interface running IGMPv1 cannot be elected as the DR
and thus cannot serve as the IGMP querier.
• You cannot enable IGMP proxying on a VLAN interface with IGMP snooping enabled, or vice
versa.
Configuration procedure
To enable IGMP proxying:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view. interface interface-type interface-number N/A