Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 407
Enabling IGMP Immediate-leave, Disabling Multicast Flooding
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Enabling IGMP Immediate-leave Configure the switch to remove a group-port association upon receiving an IGMP Leave message using the command ip igmp fast-leave from INTERFACE VLAN mode. View the configuration using the command show config from INTERFACE VLAN mode, as shown in the example below. FTOS(conf-if-vl-100)#show config ! interface Vlan 100 no ip address ip igmp snooping fast-leave shutdown FTOS(conf-if-vl-100)# Disabling Multicast Flooding If the switch receives a multicast packet that has an IP address of a group it has not learned (unregistered frame), the switch floods that packet out of all ports on the VLAN. On the E-Series, you can configure the switch to only forward unregistered packets to ports on a VLAN that are connected to multicast routers (mrouter ports) using the command no ip igmp snooping flood from CONFIGURATION mode. When flooding is disabled, if there are no such ports in the VLAN connected to a multicast router, the switch drops the packets. On the C-Series and S-Series, when you configure no ip igmp snooping flood, the system drops the packets immediately. The system does not forward the frames on mrouter ports, even if they are present. On the C-Series and S-Series, Layer 3 multicast must be disabled (no ip multicast-routing) in order to disable multicast flooding. Specifying a Port as Connected to a Multicast Router You can statically specify a port in a VLAN as connected to a multicast router using the command ip igmp snooping mrouter from INTERFACE VLAN mode. View the ports that are connected to multicast routers using the command show ip igmp snooping mrouter from EXEC Privilege mode. Internet Group Management Protocol | 407
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