Qtech QSW-3900-1x10GE [181/313] Processing of multicast protocol messages

Qtech QSW-3900-48-Т-AC [181/313] Processing of multicast protocol messages
QTECH Software Configuration Manual
12-180
before its aging timer expires, this means that some host attached to the port is receiving or
expecting to receive multicast data for that multicast group. The switch resets the aging
timer of the member port.
If no IGMP report in response to the group-specific query is heard on a member port before
its aging timer expires, this means that no hosts attached to the port are still listening to that
group address : the switch removes the port from the outgoing port list of the forwarding
table entry for that multicast group when the aging timer expires.
12.4.4 Processing of Multicast Protocol Messages
With Layer 3 multicast routing enabled, an IGMP Snooping switch processes multicast protocol messages
differently under different conditions, specifically as follows :
1) If only IGMP is enabled, or both IGMP and PIM are enabled on the switch, the switch handles multicast
protocol messages in the normal way.
2) In only PIM is enabled on the switch :
The switch broadcasts IGMP messages as unknown messages in the VLAN.
Upon receiving a PIM hello message, the switch will maintain the corresponding router
port.
3) When IGMP is disabled on the switch, or when IGMP forwarding entries are cleared (by using the reset
igmp group command) :
If PIM is disabled, the switch clears all its Layer 2 multicast entries and router ports.
If PIM is enabled, the switch clears only its Layer 2 multicast entries without deleting its
router ports.
4) When PIM is disabled on the switch :
If IGMP is disabled, the switch clears all its router ports.
If IGMP is enabled, the switch maintains all its Layer 2 multicast entries and router ports.

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