igmp-snooping ssm-mapping enable

Function

The igmp-snooping ssm-mapping enable command enables Source-Specific Multicast (SSM) mapping in a VLAN.

The undo igmp-snooping ssm-mapping enable command disables SSM mapping in a VLAN.

By default, SSM mapping is disabled in a VLAN.

Format

igmp-snooping ssm-mapping enable

undo igmp-snooping ssm-mapping enable

Parameters

None

Views

VLAN view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

On an SSM network, hosts running IGMPv1 or IGMPv2 cannot select multicast sources when they join a multicast group. To provide SSM services for these hosts, enable SSM mapping on the Layer 2 devices connected to the hosts.

Prerequisites

IGMP snooping has been enabled globally using the igmp-snooping enable (system view) command.

Follow-up Procedure

Run the igmp-snooping ssm-mapping command to configure group-source mappings.

Precautions

If IGMP snooping is disabled in the specified VLAN, the configuration succeeds but does not take effect until IGMP snooping is enabled in the VLAN. To enable IGMP snooping in a VLAN, run the igmp-snooping enable (VLAN view) command.
SSM mapping is applicable only to the VLANs where IGMP snooping can process IGMPv3 messages. To set the IGMP message version to v3, use the igmp-snooping version command in the VLAN.
If the multicast group address is an Any-Source Multicast (ASM) address, configure an SSM group policy to add the multicast group address to the SSM group range using the igmp-snooping ssm-policy command in the VLAN view.
If the inter-VLAN multicast replication function is configured, you only need to configure SSM mapping in the multicast VLAN.

Example

# Enable SSM mapping in VLAN 10.

<HUAWEI> system-view
[HUAWEI] igmp-snooping enable
[HUAWEI] vlan 10
[HUAWEI-vlan10] igmp-snooping enable
[HUAWEI-vlan10] igmp-snooping version 3
[HUAWEI-vlan10] igmp-snooping ssm-mapping enable