H3C Technologies H3C S3100 Series Switches - Manual (Page 292)

2-5
Operation Command Remarks
Enable IGMP Snooping globally igmp-snooping enable
Required
By default, IGMP Snooping is
disabled globally.
Enter VLAN view vlan vlan-id —
Enable IGMP Snooping on the
VLAN
igmp-snooping enable
Required
By default, IGMP Snooping is
disabled on all the VLANs.
z Before enabling IGMP Snooping in a VLAN, be sure to enable IGMP Snooping globally in system
view; otherwise the IGMP Snooping settings will not take effect.
z If IGMP Snooping and VLAN VPN are enabled on a VLAN at the same time, IGMP queries are
likely to fail to pass the VLAN. You can solve this problem by configuring VLAN tags for queries.
For details, see Configuring a VLAN Tag for Query Messages .
Configuring the Version of IGMP Snooping
With the development of multicast technologies, IGMPv3 has found increasingly wide application. In
IGMPv3, a host can not only join a specific multicast group but also explicitly specify to receive or reject
the information from a specific multicast source. Working with PIM-SSM, IGMPv3 enables hosts to join
specific multicast sources and groups directly, greatly simplifying multicast routing protocols and
optimizing the network topology.
Table 2-4 Configure the version of IGMP Snooping
Operation Command Remarks
Enter system view system-view —
Enter VLAN view vlan vlan-id —
Configure the version of IGMP
Snooping igmp-snooping version
version-number
Optional
The default IGMP Snooping
version is version 2.
z Before configuring related IGMP Snooping functions, you must enable IGMP Snooping in the
specified VLAN.
z Different multicast group addresses should be configured for different multicast sources because
IGMPv3 Snooping cannot distinguish multicast data from different sources to the same multicast
group.