Igmp Snooping - i3 International Cortex S243 User Manual

Port Role
Immediate Leave

IGMP Snooping

This function is used to establish the multicast groups to forward the multicast packet to the member ports, and, avoid
wasting the bandwidth while IP multicast packets are running over the network. This is because a switch that does
not support IGMP or IGMP Snooping cannot tell the multicast packet from the broadcast packet, so it can only treat them
all as the broadcast packet. Without IGMP Snooping, the multicast packet forwarding function is plain and identical from the
broadcast packet.
A switch supported b y IGMP Snooping with the functions of query and reporting can update the information of the
Multicast table when a member (port) joins or leaves an IP Multicast Destination Address. With this function, once a switch
receives an IP multicast packet, it will forward the packet to the members which had previously joined the specified IP
multicast group.
The packets will be discarded by the IGMP Snooping if the user transmits multicast packets to the multicast group that had
not been built in advance. IGMP mode enables the switch to issue IGMP function that is enabled for IGMP proxy or
snooping on the switch, which connects to a router closer to the root of the tree. This interface is the upstream interface. The
router on the upstream interface should be running IGMP.
To configure the IGMP Snooping in the web interface:

Click Configuration / IPMC / IGMP Snooping, / Basic Configuration

Select enable or disable the Global configuration.

Select which port is to become a Router Port or enable / disable the fast Leave function.

Set the Throttling parameter.

Click Apply and click the Save icon in the upper right corner to save the setting or click Reset to cancel the
setting. It will revert to previously saved values.
Configure an MVR port of the designated MVR VLAN as one of the following roles:
Inactive: The designated port does not participate in MVR operations.
Source: Configure uplink ports that receive and send multicast data as source ports.
Subscribers cannot be directly connected to source ports.
Receiver: Configure a port as a receiver port if it is a subscriber port and should only receive
multicast data. It does not receive data unless it becomes a member of the multicast group by
issuing IGMP/MLD messages.
Caution: MVR source ports are not recommended to be overlapped with management VLAN
ports. Select the port role by clicking the Role symbol to switch the setting. I indicates Inactive; S
indicates Source; R indicates Receiver . The default Role is Inactive.
Enable "Fast Leave" on the port.
80