Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 281
Disabling Multicast Flooding, Specifying a Port as Connected to a Multicast Router
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Figure 14-10. Enabling IGMP Snooping Force10(conf-if-vl-100)#show config ! interface Vlan 100 no ip address ip igmp snooping fast-leave shutdown Force10(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. Configuring the Switch as Querier Hosts that do not support unsolicited reporting wait for a general query before sending a membership report. When the multicast source and receivers are in the same VLAN, multicast traffic is not routed, and so there is no querier. You must configure the switch to be the querier for a VLAN so that hosts send membership reports, and the switch can generate a forwarding table by snooping. Configure the switch to be the querier for a VLAN by first assigning an IP address to the VLAN interface, and then using the command ip igmp snooping querier from INTERFACE VLAN mode. • IGMP snooping Querier does not start if there is a statically configured multicast router interface in the VLAN. • The switch may lose the querier election if it does not have the lowest IP address of all potential queriers on the subnet. Internet Group Management Protocol | 281
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