Device Online Help

Enabling IGMP snooping on a VLAN

For each VLAN, you need to enable:

1. IGMPSnooping using VLAN > IGMP Snooping > Globals

and

2. CtrlState using VLAN > IGMP Snooping > SnoopingControl

There are two different levels of control for IGMP snooping. The first one applies globally and if you disable it, IGMP snooping is disabled for the entire switch. This occurs regardless of whether or not, you enable the second level. The second level applies to just one VLAN and involves enabling both the IGMPSnooping and CtrlState fields to ensure that the IGMP snooping function for the VLAN is enabled.

1. To access the Globals tab and enable IGMPSnooping:
1. From the Device Manager menu bar, choose VLAN > IGMP Snooping.

The IGMPSnoop dialog box opens with the Globals tab displayed.

The table that follows describes the fields in the IGMPSnoop Globals tab.




Field	Description
IGMPSnooping	Indicates whether or not the Layer 2 IGMP capture function is enabled or disabled.
MulticastRouterOnly	Indicates the status of multicasting. When it is enabled, the 1424T switch forwards all multicast traffic to any multicast router only. When it is disabled, the 1424T switch forwards all multicast traffic to any IP router.
MaxSupportedVlans	Specifies the maximum number of supported VLANs in the Layer 2 IGMP control table. In this case, the number is 255.
MaxIPGroupNumPerVlan	Maximum number of multicast IP groups per VLAN in the Layer 2 IGMP information table. In this case, the number is 11.



2. Click enabled in the IGMPSnooping field.
3. Click enable or disable in the MulticastRouterOnly field.
4. Click Apply in the IGMPSnoop dialog box.
2. To access the SnoopingControl tab and enable CtrlState, see "Viewing IGMP snooping control data."

• Displaying IGMP snooping groups on a VLAN
• Viewing IGMP forwarding data
• Assigning ports as router ports