Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 220
Fast Convergence after MSTP Topology Changes, Designating a Multicast Router Interface
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www.dell.com | support.dell.com Fast Convergence after MSTP Topology Changes When a port transitions to the forwarding state as a result of an STP or MSTP topology change, FTOS 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. Designating a Multicast Router Interface You can designate an interface as a multicast router interface with the ip igmp snooping mrouter interface command. FTOS also has the capability of listening in on the incoming IGMP general queries and designate those interfaces as the multicast router interface when the frames have a non-zero IP source address. All IGMP control packets and IP multicast data traffic originating from receivers is forwarded to multicast router interfaces. 218 | Internet Group Management Protocol (IGMP)
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