User's Manual

318
Command Purpose
ip igmp-snooping
policy
word Adds IPACL in generating multicast
forwarding table.
no ip igmp-snooping policy
Deletes IPACL in generating multicast
forwarding table.
42.1.6 Configuring the Function to Filter Multicast Message Without
Registered Destination Addresss
When multicast message target fails to be found (DLF, the destination address is not registered in the switch
chip through igmp-snooping), the default process method is to send message on all ports of VLAN.Through
configuration, you can change the process method and all multicast messages whose destination addresses
are not registered to any port will be dropped.
Command Description
ip igmp-snooping dlf-drop
Drops multicast message whose destination fails to be found.
no ip igmp-snooping dlf-drop
Resumes the fault configuration (forward).
Note:
(7)
The attribute is configured for all VLANs.
1)
The default method for the switch to handle this type of message is forward (message of this
type will be broadcasted within VLAN).
42.1.7 Configuring Router Age Timer of IGMP Snooping
The Router Age timer is used to monitor whether the IGMP inquirer exists. IGMP inquirers maintain multicast
addresses by sending query message. IGMP snooping works through communication between IGMP inquirer
and host.
Perform the following configurations in global configuration mode:
Command Description
ip igmp-snooping timer router-age
timer_value Configures the value of Router Age of
IGMP-snooping.
no ip igmp-snooping timer router-age
Resumes the default value of Router Age of
IGMP-snooping.
Note:
For how to configure the timer, refer to the query period setup of IGMP inquirer. The timer cannot be set to be smaller
than query period. It is recommended that the timer is set to three times of the query period.
The default value of Router Age of IGMP snooping is 260 seconds.
42.1.8 Configuring Response Time of IGMP Snooping.
The response time is the upper limit time that the host reports the multicast after IGMP inquirer