D-Link DWS-4026 Product Manual - Page 217
VLAN Configuration, Table 121, IGMP Snooping VLAN Configuration Fields, Field, Description
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Software User Manual 12/10/09 D-Link Unified Access System VLAN CONFIGURATION Use the IGMP Snooping VLAN Configuration page to configure IGMP snooping settings for VLANs on the system. To access the IGMP Snooping VLAN Configuration page, click LAN > L2 Features > IGMP Snooping > VLAN Configuration in the navigation tree. Figure 138: IGMP Snooping VLAN Configuration Table 121: IGMP Snooping VLAN Configuration Fields Field VLAN ID Admin Mode Fast Leave Admin Mode Group Membership Interval Maximum Response Time Operational Maximum Response Time Description From the drop-down menu, select the VLAN ID of the VLAN to modify, or select New Entry to configure settings for a VLAN that does not have IGMP Snooping enabled. Enable is the only available option from the drop-down menu. To disable the IGMP snooping admin mode on the VLAN, select the VLAN from the VLAN ID field and click Delete. Enabling fast-leave allows the switch to immediately remove the layer 2 LAN interface from its forwarding table entry upon receiving an IGMP leave message for that multicast group without first sending out MAC-based general queries to the interface. You should enable fast-leave admin mode only on VLANs where only one host is connected to each layer 2 LAN port. This prevents the inadvertent dropping of the other hosts that were connected to the same layer 2 LAN port but were still interested in receiving multicast traffic directed to that group. Also, fast-leave processing is supported only with IGMP version 2 hosts. The Group Membership Interval time is the amount of time in seconds that a switch waits for a report from a particular group on a particular interface before deleting the interface from the entry. This value must be greater than the IGMPv3 Maximum Response time value. The range is 2 to 3600 seconds. Enter the amount of time in seconds that a switch will wait after sending a query on an interface because it did not receive a report for a particular group in that interface. This value must be less than the Group Membership Interval time value. The range is 1 to 25 seconds. This read-only field displays the value for maximum response time of IGMP Snooping for the specified VLAN ID. Its value is learned dynamically from the IGMPv2 or IGMPv3 queries received on this VLAN. For the multicast traffic not to get disturbed, you should configure group membership interval to be greater than this value. Document 34CSFP6XXUWS-SWUM100-D7 Configuring IGMP Snooping Page 217