Lantronix SISPM1040-3166-L Web User Guide Rev G PDF 14.13 MB - Page 198
Multicast
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Transition Networks SISPM1040-3xxx-L Web User Guide Chapter 13 - Multicast 13-1 IGMP Snooping IGMP Snooping is used to establish the multicast groups to forward the multicast packet to the member ports, and, in nature, avoids 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 nothing is different from broadcast packet. A switch supporting IGMP Snooping with query, report and leave (a type of packet exchanged between IP Multicast Router/Switch and IP Multicast Host) functions 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 who joined in a specified IP multicast group before. The packets will be discarded by the IGMP Snooping if the user transmits multicast packets to a multicast group that had not been built up in advance. IGMP mode lets the switch issue IGMP function that you enable 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. 13-1.1 Basic Configuration This page lets you set the basic IGMP 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 Web Interface To configure IGMP Snooping parameters in the web interface: 1. Click Multicast, IGMP Snooping and Basic Configuration. 2. Enable or disable Global configuration parameters. 3. Select the port want to become a Router Port or enable/ disable the Fast Leave function. 4. Set Throttling and Profile, then click the Apply button to save the settings. 33763 Rev. G Figure 13-1.1: IGMP Snooping Basic Configuration https://www.transition.com Page 198 of 496