Disabling Multicast Flooding; Specifying A Port As Connected To A Multicast Router; Configuring The Switch As Querier; Ip Igmp Snooping Mrouter - Dell Force10 Z9000 Configuration Manual

INTERFACE VLAN mode
ip igmp fast-leave
• View the configuration.
INTERFACE VLAN mode
show config
Example of Configuration Output After Removing a Group-Port Association
Dell(conf-if-vl-100)#show config
!
interface Vlan 100
no ip address
ip igmp snooping fast-leave
shutdown
Dell(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.
When you configure the no ip igmp snooping flood command, the system drops the packets immediately. The system does
not forward the frames on mrouter ports, even if they are present. Disable Layer 3 multicast (no ip multicast-routing) in
order to disable multicast flooding.
• Configure the switch to only forward unregistered packets to ports on a VLAN that are connected to mrouter ports.
CONFIGURATION mode
no ip igmp snooping flood

Specifying a Port as Connected to a Multicast Router

To statically specify or view a port in a VLAN, use the following commands.
• Statically specify a port in a VLAN as connected to a multicast router.
INTERFACE VLAN mode

ip igmp snooping mrouter

• View the ports that are connected to multicast routers.
EXEC Privilege mode.

show ip igmp snooping mrouter

Configuring the Switch as Querier

To configure the switch as a querier, use the following command.
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. 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.
INTERFACE VLAN mode

ip igmp snooping querier

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.
268
Internet Group Management Protocol (IGMP)