Configuration Guide Configuring IGMP Snooping
 Configuring the Aging Time of a Dynamic Router Port
The default aging time is 300s.
When a dynamic router port receives a query packet, the aging timer of the port is enabled or reset; if the aging time is not
configured, the maximum response time carried by the query packet is used as the aging time.
Run ip igmp snooping dyn-mr-aging-time to configure the aging time of the dynamic router port.
 Configuring the Aging Time of a Dynamic Member Port
The default aging time is 260s.
When a dynamic member port receives a query packet, the aging timer of the port is enabled or reset, and the aging time is
the maximum response time carried by the query packet.
When a dynamic member port receives a Report packet, the aging timer of the port is enabled or reset, and the aging time is
the maximum response time of the dynamic member port.
Run ip igmp snooping host-aging-time to configure the aging time of the dynamic member port.
 Configuring the Maximum Response Time of a Query Packet
The maximum response time of a query packet is not configured by default and the maximum response time carries by the
query packet is used.
Run ip igmp snooping query-max-response-time to configure the maximum response time of a query packet.
10.3.2 IGMP Snooping Working Modes
A device running in the three modes (IVGL, SVGL, and IVGL-SVGL) of IGMP snooping can provide independent multicast
services or shared multicast services to the user VLAN.
Working Principle
 IVGL
In IVGL mode, a device running IGMP snooping can provide independent multicast services to each user VLAN.
Independent multicast services indicate that multicast traffic can be forwarded only within the VLAN it belongs to, and a user
host can subscribe to the multicast traffic within the VLAN the host belongs to.
Related Configuration
 Enabling IGMP Snooping and Selecting a Working Mode
IGMP snooping is disabled by default.
Run the ip igmp snooping ivgl command to enable IGMP snooping in IVGL mode.
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