D-Link DGS-1224T Product Manual - Page 36
Last Member Query Interval 1-25 sec, Max Response Time 10-25 sec - vlan
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5 Configuration D-Link Web Smart Switch User Manual Figure 56 - Configuration > IGMP Snooping Configuration By default, IGMP is disabled. If enabled, the IGMP Global Settings will need to be entered: Querier State: D-Link Smart Switch is able to send out the IGMP Queries to check the status of multicast clients. Default is disabled. Query Interval (60-600 sec): The Query Interval is the interval between General Queries sent. By adjusting the Query Interval, the number of IGMP messages can increase or decrease; larger values cause IGMP Queries to be sent less often. Default is 125 seconds. Max Response Time (10-25 sec): The Max Response Time specifies the maximum allowed time before sending a responding report. Adjusting this setting effects the "leave latency", or the time between the moment the last host leaves a group and when the IGMP protocol is notified that there are no more members. It also allows adjustments for controlling the frequency of IGMP traffic on a subnet. Default is 10 seconds. Robustness Variable (2-255 sec): The Robustness Variable allows adjustment for the expected packet loss on a subnet. If a subnet is expected to be lossy, the Robustness Variable may be increased. The Robustness Variable can not be set zero, and SHOULD NOT be one. Default is 2 seconds. Last Member Query Interval (1-25 sec): The Last Member Query Interval is the Max Response Time inserted into Group-Specific Queries sent in response to Leave Group messages, and is also the amount of time between Group-Specific Query messages. This value may be adjusted to modify the "leave latency" of the network. A reduced value results in reduced time to detect the loss of the last member of a group. Default is 1 second. Host Timeout (System assigned): This is the interval after which a learnt host port entry will be purged. For each host port learnt, a 'Port Purge Timer' runs for 'Host Port Purge Interval'. This timer will be restarted whenever a report message from host is received over that port. If no report messages are received for 'Host Port Purge Interval' time, the learnt host entry will be purged from the multicast group. After entering Max Response Time, Robustness Variable and Last Member Query Interval, system will auto assign the value of Host Timeout. Router Timeout (60-600 sec): This is the interval after which a learnt router port entry will be purged. For each router port learnt, a 'Router Port Purge Timer' runs for 'Router Port Purge Interval'. This timer will be restarted whenever a router control message is received over that port. If no router control messages are received for 'Router Port Purge Interval' time, the learnt router port entry will be purged. Default is 260 seconds. Leave Timer (0-25 sec): This is the interval after which a Leave message is forwarded on a port. When a leave message from a host for a group is received, a group-specific query is sent to the port on which the leave message is received. A timer is started with a time interval equal to Igs Leave Process Interval. If a report message is received before above timer expires, the Leave message is dropped. Otherwise the Leave message is either forwarded to the port. Default is 1 second. To enable IGMP snooping for a given VLAN, select enable and click on the Apply button. Then press the Edit button under Router Port Setting, and select the ports to be assigned for IGMP snooping for the VLAN, and press Apply for changes to take effect. 32