Configure IGMP snooping Basic Functions

In the configuration tasks of IGMP snooping, you should first enable the IGMP snooping function so that the configuration of the other functions can take effect.

Configuration Condition

Before configuring the basic functions of IGMP snooping, first complete the following task:

• Configure VLAN

Enable IGMP snooping Function

After enabling IGMP snooping function, the device can run the IGMP snooping function.

Table 2-2 Enable IGMP snooping function

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   After enabling the global IGMP snooping function, you can enable the IGMP snooping function of the specified VLAN.

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Configure IGMP snooping Version

The configured IGMP snooping version and the processing rules of the IGMP protocol packets are as follows:

The configured IGMP snooping version is V3 and the device can process IGMP protocol packets of V1, V2 and V3;

The configured IGMP snooping version is V2 and the device can process the IGMP protocol packets of V1 and V2 and does not process V3 protocol packets, but make V3 protocol packets flood in VLAN.

The configured IGMP snooping version is V1 and the device can process the IGMP protocol packets of V1 and does not process V2 or V3 protocol packets, but make V2 and V3 protocol packets flood in VLAN.

Table 2-3 Configure IGMP snooping version

Enable IGMP snooping L2 Forwarding

Usually, IGMP snooping forwards the multicast service packet in VLAN according to the multicast source IP address and multicast destination IP address. After configuring IGMP snooping L2 forwarding, IGMP snooping forwards multicast service packets in VLAN according to the multicast destination MAC address.

Table 2-4 IGMP snooping L2 forwarding

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  Because 32 multicast IP addresses correspond to one multicast MAC address, and L2 forwarding can't specify multicast source forwarding, there may be multiple IP multicast source groups corresponding to the same MAC group. At this time, there will be forwarding conflict.

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