Adjusting the Last Member Query IntervalTo adjust the last member query interval, use the following command.When the querier receives a Leave message from a receiver, it sends a group-specific query out of theports specified in the forwarding table. If no response is received, it sends another. The amount of timethat the querier waits to receive a response to the initial query before sending a second one is the lastmember query interval (LMQI). The switch waits one LMQI after the second query before removing thegroup-port entry from the forwarding table.• Adjust the last member query interval.INTERFACE VLAN modeip igmp snooping last-member-query-intervalFast Convergence after MSTP Topology ChangesWhen a port transitions to the Forwarding state as a result of an STP or MSTP topology change, DellNetworking OS sends a general query out of all ports except the multicast router ports. The host sends aresponse to the general query and the forwarding database is updated without having to wait for thequery interval to expire.When an IGMP snooping switch is not acting as a querier, it sends out the general query in response tothe MSTP triggered link-layer topology change, with the source IP address of 0.0.0.0 to avoid triggeringquerier election.Egress Interface Selection (EIS) for HTTP and IGMPApplicationsYou can use the Egress Interface Selection (EIS) feature to isolate the management and front-end portdomains for HTTP and IGMP traffic. Also, EIS enables you to configure the responses to switch-destinedtraffic by using the management port IP address as the source IP address. This information is sent out ofthe switch through the management port instead of the front-end port.The management EIS feature is applicable only for the out-of-band (OOB) management port. Referencesin this section to the management default route or static route denote the routes configured using themanagement route command. The management default route can be either configured statically orreturned dynamically by the DHCP client. A static route points to the management interface or aforwarding router.Transit traffic (destination IP not configured in the switch) that is received on the front-end port withdestination on the management port is dropped and received in the management port with destinationon the front-end port is dropped.Switch-destined traffic (destination IP configured in the switch) is:• Received in the front-end port with destination IP equal to management port IP address ormanagement port subnet broadcast address is dropped.• Received in the management port with destination IP not equal to management IP address ormanagement subnet broadcast address is dropped.Traffic (switch initiated management traffic or responses to switch-destined traffic with management portIP address as the source IP address) for user-specified management protocols must exit out of theInternet Group Management Protocol (IGMP) 365
