Security enhancement for IGMP
Syntax:[no] ip igmp max-response-time num
The num variable specifies the number of seconds and can be a value from 1 to 25. The default is 10.
Security enhancement for IGMP
A security enhancement was made to IGMPv2 to comply with the following recommendation of RFC 2236: “Ignore the Report if you cannot identify the source address of the packet as belonging to a subnet assigned to the interface on which the packet was received.”
NOTE
When used in applications such as
Adding an interface to a multicast group
You can manually add an interface to a multicast group. This is useful in the following cases:
•Hosts attached to the interface are unable to add themselves as members of the group using IGMP.
•There are no members for the group attached to the interface.
When you manually add an interface to a multicast group, the device forwards multicast packets for the group but does not itself accept packets for the group.
You can manually add a multicast group to individual ports only. If the port is a member of a virtual routing and forwarding (VRF) interface, you must add the ports to the group individually.
To manually add a port to a multicast group, enter a command such as the following at the configuration level for the port.
This command adds port 1/1 to multicast group 224.2.2.2.
To add a port that is a member of a VRF interface to a multicast group, enter a command such as the following at the configuration level for the virtual routing interface.
This command adds port 5/2 in VRF interface 1 to multicast group 224.2.2.2.
Syntax: [no] ip igmp
The
The ethernet slot/portnum parameter specifies the port number. Use this parameter if the port is a member of a VRF interface, and you are entering this command at the configuration level for the VRF interface.
Manually added groups are included in the group information displayed by the following commands:
•show ip igmp group
•show ip pim group
FastIron Ethernet Switch IP Multicast Configuration Guide | 75 |
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