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FTOS Configuration Guide for the C-Series - Force10 Networks

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Enabling IGMP Immediate-leave<br />

Configure <strong>the</strong> switch to remove a group-port association upon receiving an IGMP Leave message using <strong>the</strong><br />

command ip igmp fast-leave from INTERFACE VLAN mode. View <strong>the</strong> configuration using <strong>the</strong> command<br />

show config from INTERFACE VLAN mode, as shown in Figure 418.<br />

Figure 418 Enabling IGMP Snooping<br />

<strong>Force10</strong>(conf-if-vl-100)#show config<br />

!<br />

interface Vlan 100<br />

no ip address<br />

ip igmp snooping fast-leave<br />

shutdown<br />

<strong>Force10</strong>(conf-if-vl-100)#<br />

Disabling Multicast Flooding<br />

If <strong>the</strong> switch receives a multicast packet that has an IP address of a group it has not learned (unregistered<br />

frame), <strong>the</strong> switch floods that packet out of all ports on <strong>the</strong> VLAN.<br />

You can configure <strong>the</strong> switch to only <strong>for</strong>ward unregistered packets to ports on a VLAN connected to<br />

multicast routers using <strong>the</strong> command no ip igmp snooping flood from CONFIGURATION mode.<br />

Specifying a Port as Connected to a Multicast Router<br />

You can statically specify that a port in a VLAN as connected to a multicast router using <strong>the</strong> command ip<br />

igmp snooping mrouter from INTERFACE VLAN mode.<br />

View <strong>the</strong> ports that are connected to multicast routers using <strong>the</strong> command show ip igmp snooping<br />

mrouter from EXEC Privilege mode.<br />

Configuring <strong>the</strong> Switch as Querier<br />

Hosts that do not support unsolicited reporting wait <strong>for</strong> a general query be<strong>for</strong>e sending a membership<br />

report. When <strong>the</strong> multicast source and receivers are in <strong>the</strong> same VLAN, multicast traffic is not routed, and<br />

so <strong>the</strong>re is no querier. You must configure <strong>the</strong> switch to be <strong>the</strong> querier <strong>for</strong> a VLAN so that hosts send<br />

membership reports, and <strong>the</strong> switch can generate a <strong>for</strong>warding table by snooping.<br />

Configure <strong>the</strong> switch to be <strong>the</strong> querier <strong>for</strong> a VLAN by first assigning an IP address to <strong>the</strong> VLAN interface,<br />

and <strong>the</strong>n using <strong>the</strong> command ip igmp snooping querier from INTERFACE VLAN mode.<br />

• IGMP snooping Querier does not start if <strong>the</strong>re is a statically configured multicast router interface in <strong>the</strong><br />

VLAN.<br />

• The switch may lose <strong>the</strong> querier election if it does not have <strong>the</strong> lowest IP address of all potential<br />

queriers on <strong>the</strong> subnet.<br />

594 Internet Group Management Protocol

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