Planet Technology FGSW-2620VM - Manual (Page 50)

FGSW-2620VM User’s Manual
members exist on their sub networks. If there is no response from a particular group, the router assumes that there are
no group members on the network.
The Time-to-Live (TTL) field of query messages is set to 1 so that the queries will not be forwarded to other sub
networks.
IGMP version 2 introduces some enhancements such as a method to elect a multicast queried for each LAN, an explicit
leave message, and query messages that are specific to a given group.
The states a computer will go through to join or to leave a multicast group are shown below:
Non-Member
Delaying Member Idle Member
Leave Group
Leave Group
(Stop Timer)
Join Group
(Send Report,
Start Timer)
Query Received
(Start Timer)
Report Received
(Stop Timer)
Timer Expried
(Send report)
IGMP State Transitions
IGMP Snooping Configuration
The default status of the IGMP Snooping function is disabled. To turn on the IGMP Snooping, select “Enable” of the
IGMP Snooping Status field and click on the “OK” button to save.
4.3.3.1 IGMP Configuration
The switch support IP multicast, you can enable IGMP protocol on web management's switch setting advanced page,
then display the IGMP snooping information in this page, you can view difference multicast group VID and member port
in here, IP multicast addresses range from 224.0.0.0 through 239.255.255.255.
The Internet Group Management Protocol (IGMP) is an internal protocol of the Internet Protocol (IP) suite. IP manages
multicast traffic by using switches, routers, and hosts that support IGMP. Enabling IGMP allows the ports to detect IGMP
queries and report packets and manage IP multicast traffic through the switch. IGMP have three fundamental types of
message as follows:
Message Description
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