Configuration Guide IGMP Snooping Configuration
After receiving the IGMP query(general or specific-group query) packets, the IP multicast
group member host responds to the received packets.
If the host wants to join in an IP multicast group, it will take the initiative to send the IGMP
membership report to the IGMP querier and claim to join in the IP multicast group.
Upon receiving the IGMP membership report message, the switch forwards the message
through all router ports in the VLAN, analyzes the IP multicast group address from the
message to add to the host, and deals with the packet-receiving port as follows:
If the corresponding forwarding entry of IP multicast group is inexistent, create a forwarding
entry, add the dynamic member port to the outgoing port list, and enable the aging timer.
If the corresponding forwarding entry of IP multicast group exists but the outgoing port list
excludes the port, add the dynamic member port to the outgoing port list, and enable the aging
timer.
If the corresponding forwarding entry of IP multicast group exists and the outgoing port list
includes the port, reset the aging timer.
Leaving the Multicast Group
When leaving the IP multicast group, the host notifies the multicast router of the leave event by
sending the IGMP leave group packets. Upon receiving the IGMP leave group packets on a
dynamic member port, the switch forwards those packets to the router ports.
IGMP Profiles
IGMP Profiles is the group filterings actually, defines a series of multicast address range and
the access to those multicast addresses(permit/deny), including “Multicast address range in
the SVGL mode”, “Filtering multicast data range of router port”, “IGMP Filtering range”.
Working Modes
DISABLE: The IGMP Snooping does not work in this mode. That is, the switch does not snoop
the IGMP messages between the host and the router. Multicast frames are forwarded in the
VLAN in the broadcast form.
IVGL(Independent VLAN Group Learning): In this mode, the multicast flows in different VLANs
are independent. A host can only request multicast flows to the router interface in the same
VLAN. Upon receiving the multicast flow in any VLAN, the switch forwards the flow to the
member port in the same VLAN.
Configuration
We will describe how to configure IGMP snooping in the following sections
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