Fast Convergence After Mstp Topology Changes; Egress Interface Selection (Eis) For Http And Igmp Applications - Dell S4820T Configuration Manual

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INTERFACE VLAN mode

ip igmp snooping querier

IGMP snooping querier does not start if there is a statically configured multicast router interface in the

The switch may lose the querier election if it does not have the lowest IP address of all potential

queriers on the subnet.

When enabled, IGMP snooping querier starts after one query interval in case no IGMP general query

(with IP SA lower than its VLAN IP address) is received on any of its VLAN members.

Adjusting the Last Member Query Interval

To 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 the

ports specified in the forwarding table. If no response is received, it sends another. The amount of time

that the querier waits to receive a response to the initial query before sending a second one is the last

member query interval (LMQI). The switch waits one LMQI after the second query before removing the

group-port entry from the forwarding table.

Adjust the last member query interval.

INTERFACE VLAN mode

ip igmp snooping last-member-query-interval

Fast Convergence after MSTP Topology Changes

The following describes the fast convergence feature.

When a port transitions to the Forwarding state as a result of an STP or MSTP topology change, Dell

Networking OS sends a general query out of all ports except the multicast router ports. The host sends a

response to the general query and the forwarding database is updated without having to wait for the

query interval to expire.

When an IGMP snooping switch is not acting as a querier, it sends out the general query in response to

the MSTP triggered link-layer topology change, with the source IP address of 0.0.0.0 to avoid triggering

querier election.

Egress Interface Selection (EIS) for HTTP and IGMP

Applications

You can use the Egress Interface Selection (EIS) feature to isolate the management and front-end port

domains for HTTP and IGMP traffic. Also, EIS enables you to configure the responses to switch-destined

traffic by using the management port IP address as the source IP address. This information is sent out of

the switch through the management port instead of the front-end port.

Internet Group Management Protocol (IGMP)

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