Chapter 22
| Multicast Filtering Commands
IGMP (Layer 3)
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Default Setting
IGMP Version 2
Command Mode
Interface Configuration (VLAN)
Command Usage
â—† All routers on the subnet must support the same version. However, the
multicast hosts on the subnet may support any of the IGMP versions 1 - 3.
â—† If the switch receives an IGMP Version 1 Membership Report, it sets a timer to
note that there are Version 1 hosts which are members of the group for which it
heard the report.
If there are Version 1 hosts present for a particular group, the switch will ignore
any Leave Group messages that it receives for that group.
Example
Console(config-if)#ip igmp version 1
Console(config-if)#
clear ip igmp group This command deletes entries from the IGMP cache.
Syntax
clear ip igmp group [group-address | interface interface]
group-address - IP address of the multicast group.
interface
vlan vlan-id - VLAN ID. (Range: 1-4094)
Default Setting
Deletes all entries in the cache if no options are selected.
Command Mode
Privileged Exec
Command Usage
Enter the address for a multicast group to delete all entries for the specified group.
Enter the interface option to delete all multicast groups for the specified interface.
Enter no options to clear all multicast groups from the cache.
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