C
HAPTER
17
| IGMP Commands
– 284 –
igmp router This command displays or sets specified ports which are attached to a
known IGMP router.
SYNTAX
igmp router [port-list] [enable | disable]
port-list - A specific port or a range of ports. (Range: 1-28, or all)
enable - Sets the specified ports to function as a router port, which
leads towards a Layer 3 multicast device or IGMP querier.
disable - Disables router port functionality on the specified ports.
DEFAULT SETTING
Disabled
COMMAND USAGE
If IGMP snooping cannot locate the IGMP querier, you can manually
designate a port which is connected to a known IGMP querier (i.e., a
multicast router/switch). This interface will then join all the current
multicast groups supported by the attached router/switch to ensure that
multicast traffic is passed to all appropriate interfaces within the switch.
EXAMPLE
IGMP>router 9 enable
IGMP>
igmp flooding This command displays or sets flooding of unregistered IGMP services.
SYNTAX
igmp flooding [enable | disable]
enable - Floods unregistered multicast traffic into the attached
VLAN.
disable - Disables IGMP flooding.
DEFAULT SETTING
Disabled
COMMAND USAGE
Once the table used to store multicast entries for IGMP snooping is filled,
no new entries are learned. If no router port is configured in the attached
VLAN, and unregistered multicast flooding is disabled, any subsequent
multicast traffic not found in the table is dropped, otherwise it is flooded
throughout the VLAN.
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