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 4-54 IGMP Snooping Settins Window (RI Mode Only)
Figure 4-55 IGMP Snooping Settings window (EI and SI Mode Only)
The fields that can be configured are described below:
Parameter Description
IGMP Snooping State Click to enable or disable the IGMP Snooping state.
Max Learning Entry Value (1-1024)
Enter the maximum learning entry value. (EI and SI Mode Only)
Click the Apply button to accept the changes made for each individual section.
Click the Edit button to configure the IGMP Snooping Parameters Settings.
Click the Modify Router Port link to configure the IGMP Snooping Router Port Settings.
After clicking the Edit button, the following window will appear:
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Figure 4-56 IGMP Snooping Parameters Settings window (RI Mode Only)
Figure 4-57 IGMP Snooping Parameters Settings window (EI and SI Mode Only)
The fields that can be configured are described below:
Parameter Description
Query Interval (1-65535) Specify the amount of time in seconds between general query transmissions. The default setting is 125 seconds.
Max Response Time (1-25)
Specify the maximum time in seconds to wait for reports from members. The default setting is 10 seconds.
Robustness Value (1-7) Provides fine-tuning to allow for expected packet loss on a subnet. The value of the robustness value is used in calculating the following IGMP message intervals: By default, the robustness variable is set to 2.
Last Member Query Interval (1-25)
Specify the maximum amount of time between group-specific query messages, including those sent in response to leave-group messages. You might lower this interval to reduce the amount of time it takes a router to detect the loss of the last member of a group.
Data Drive Group Expiry Time (1-65535)
Specify the data driven group lifetime in seconds. (EI and SI Mode Only)
Proxy Reporting Source IP
Enter the source IP of proxy reporting integrated report.
Proxy Reporting State Use the drop-down menu to enable or disable the proxy reporting. If enabled, multiple IGMP reports or leave for a specific (S, G) will be integrated into one report only before sending to the router port.
Querier State Specify to enable or disable the querier state.
Fast Leave Enable or disable the IGMP snooping fast leave function. If enabled, the membership is immediately removed when the system receive the IGMP leave message.
State If the state is enabled, it allows the switch to be selected as an IGMP Querier (sends IGMP query packets). It the state is disabled, then the switch cannot play
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NOTE: that if the Layer 3 router connected to the switch provides only the IGMP proxy function but does not provide the multicast routing function, then this state must be configured as disabled. Otherwise, if the Layer 3 router is not selected as the querier, it will not send the IGMP query packet. Since it will not also send the multicast-routing protocol packet, the port will be timed out as a router port.
Data Driven Learning State
Specify to enable or disable the data driven learning state. (EI and SI Mode Only)
Data Drive Learning Aged Out
Specify to enable or disable the data drive learning aged out option. (EI and SI Mode Only)
Version Specify the version of IGMP packet that will be sent by this port. If an IGMP packet received by the interface has a version higher than the specified version, this packet will be dropped.
Click the Apply button to accept the changes made.
Click the <<Back button to discard the changes made and return to the previous page.
After clicking the Modify Router Port link, the following window will appear:
Figure 4-58 IGMP Snooping Router Port Settings window
The fields that can be configured are described below:
Parameter Description
Unit Select the unit you want to configure. (EI and SI Mode Only)
Static Router Port This section is used to designate a range of ports as being connected to multicast-enabled routers. This will ensure that all packets with such a router as its destination will reach the multicast-enabled router regardless of the protocol.
Forbidden Router Port This section is used to designate a range of ports as being not connected to multicast-enabled routers. This ensures that the forbidden router port will not propagate routing packets out.
Dynamic Router Port Displays router ports that have been dynamically configured.
Ports Select the appropriate ports individually to include them in the Router Port configuration.
Click the Select All button to select all the ports for configuration.
Click the Clear All button to unselect all the ports for configuration.
Click the Apply button to accept the changes made.
Click the <<Back button to discard the changes made and return to the previous page.
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