User’s Manual of
4.8 IGMP Snooping
The Internet Group Management Protocol (IGMP) lets host and routers share information about multicast groups memberships. IGMP snooping is a switch feature that monitors the exchange of IGMP messages and copies them to the CPU for feature processing. The overall purpose of IGMP Snooping is to limit the forwarding of multicast frames to only ports that are a member of the multicast group.
4.8.1 IGMP Snooping Configuration
The IGMP Configuration page let the administrator to configure the parameters for IGMP Snooping, which is used to build forwarding lists for multicast traffic. The screen in Figure
Figure
The page includes the following fields:
• IGMP Enable | Enables or disables IGMP global function on the device. |
| Disabled is the default value. |
• Router Ports | The Router Ports check box fields for attaching ports to a device that is attached to a |
| neighboring Multicast router/switch. Once IGMP Snooping is enabled, Multicast |
| packets are forwarded to the appropriate port . |
•Unregistered IPMC The function is to set “Enable” or “Disable” to allow the unregistered IP Multicast
Flooding Enable Group streams to flood to all ports of this switch. The unregistered IP Multicast means
that the received Multicast Group address not listed in the Multicast Group Table of the switch.
Enabled is the default value. The switch forwards all the multicast steams to all the host or linked switch.
• VLAN ID | Identifies a VLAN and contains information about the Multicast group configuration. |
| Add a new VLAN group and the Table will add the VLAN entry automatically. |
• IGMP Snooping | Enables or disables IGMP snooping on the VLAN. Ports be assign to the VLAN will be |
Enabled | applied to filter the Multicast stream. |
| Enabled is the default value. |
•IGMP Querying Enables or disables IGMP Query mode on the VLAN. The Query mode is used to