D-Link DGS-1520 User Manual - Page 189

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide Parameter Action Type Tunneled Protocol Protocol MAC Threshold Description Select Add to add a new entry based in the information entered. Select Delete to delete an entry based in the information entered. Select the type option here. Options to choose from are None, Shutdown, and Drop. Select the tunneled protocol option here. Options to choose from are GVRP, STP, Protocol MAC, and All. After selecting the Protocol MAC option as the Tunneled Protocol, the following option will be available. Select the protocol MAC option here. Options to choose from are 01-00-0C-CC-CC-CC and 01-00-0C-CC-CC-CD. After selecting the Shutdown or Drop option in the Type field, the following parameter will be available. Enter the threshold value here. This value must be between 1 and 4096. Click the Apply button to accept the changes made. Click the Clear All button to clear all the counter information. Click the Clear button to clear all the counter information of the specific entry. L2 Multicast Control IGMP Snooping Internet Group Management Protocol (IGMP) snooping allows the Switch to recognize IGMP queries and reports sent between network stations or devices and an IGMP host. IGMP Snooping Settings In order to use IGMP Snooping it must first be enabled for the entire Switch under IGMP Global Settings at the top of the window. You may then fine-tune the settings for each VLAN by clicking the corresponding Edit button. When enabled for IGMP snooping, the Switch can open or close a port to a specific multicast group member based on IGMP messages sent from the device to the IGMP host or vice versa. The Switch monitors IGMP messages and discontinues forwarding multicast packets when there are no longer hosts requesting that they continue. To view the following window, click L2 Features > L2 Multicast Control > IGMP Snooping > IGMP Snooping Settings, as shown below: Figure 5-72 IGMP Snooping Settings Window 179