Luxul XMS-1024P - Manual (Page 120)

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XMS-1024P
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LUX-UG-XMS-1024P Vers: 081314
An IGMP Report Message is sent by the client device when it applies to join a Multicast
group or when responding to the IGMP Query Messages from the Multicast Server.
When receiving IGMP Report Message, the Switch will send the Report Message to
the Multicast Sever Port in the specified VLAN as well as analyze the message to get
the Address of the Multicast Group the host applies to join. The receiving Port will
be processed if the receiving Port is a new member Port and it will be added to the
Multicast MAC Table with its member Port time specified. If the receiving Port is
already a member Port, its member Port time will be reset.
3. IGMP Leave Message
Client devices running IGMPv1 do not send IGMP Leave Messages when leaving a
Multicast group. As a result, the Switch does not receive the Leave information of the
client device. However after leaving the Multicast group, the host does not send IGMP
Report Messages, so the Switch will remove the Port from the corresponding Multicast
MAC Table when its member Port time elapses. Client devices running IGMPv2 or
IGMPv3 send IGMP Leave Messages when leaving a Multicast group to inform the
Multicast Server it is leaving the group.
When receiving IGMP Leave Messages, the Switch will forward an IGMP Group-
Specific-Query Message to check if other members in the Multicast group of the
member Port still need this Multicast and reset the member Port times. When the Leave
Time elapses, the Switch will remove the Port from the corresponding Multicast group.
If no other member remains in the group after the Port is removed, the Switch will send
IGMP Leave Messages to the Multicast Server and remove the whole Multicast group.
IGMP Snooping Fundamentals
1. Ports
Router Port: Indicates the Switch Port directly connected to the Multicast Server.
Member Port: Indicates a Switch Port connected to a Multicast Group member.
2. Timers
Router Port Time: Within the time specified if the Switch does not receive any IGMP
Query Messages from the Router Port, it will no longer consider this Port a Router Port.
The default value is 300 seconds.
Member Port Time: Within the time specified if the Switch does not receive any IGMP
Report Messages from the member Port, it will no longer consider this Port a member
Port. The default value is 260 seconds.