Allied Telesis AR400 manual z the streams group entry times out and is refreshed, or

Stopping snoopers from snooping non-IGMP messages > Preventing an All Groups entry for a port

9.Display port 24’s packet counters, which show that many multicast packets have been transmitted on the port.

Manager Switch 2> show switch port=24 counter

Switch Port Counters

------------------------------------------------------------------------

Port 24. Fast Ethernet MAC counters:
Combined receive/transmit packets by size (octets) counters:
64	84 512 - 1023		0
65 - 127	16 1024 - MaxPktSz		830
128 - 255	0	1519 - 1522	0
256 - 511		0
General Counters:
Receive		Transmit
Octets	1312 Octets		1135836
Pkts	16	Pkts	914
FCSErrors	0	FCSErrors	0
MulticastPkts	16	MulticastPkts	914
BroadcastPkts	0	BroadcastPkts	0
PauseMACCtlFrms	0	PauseMACCtrlFrm	0
OversizePkts	0	OversizePkts	0
Fragments	0	Fragments	0
Jabbers	0	Jabbers	0
.
.

.

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In summary, when a port receives the All Groups designation, a stream is sent to that port when either:

zthe stream's group entry times out and is refreshed, or

zthe port's internal timer hits zero and is refreshed

It is most likely that the group entry will time out first.

Page 94 AlliedWare™ OS How To Note: IGMP