How Query Solicitation Works - Allied Telesis AR400 Series How To Configure

The following figure shows how Query Solicitation works when a port goes down.
Initial state:
1. Link to Switch 4
2. Switch 2 receives
3. Switch 1 receives
4. Host receives GQ
Final state:
Page 27 | AlliedWare™ OS How To Note: IGMP
Query solicitation (rapid recovery from topology changes) > How query solicitation works
Port on Switch 3
is blocking.
Multicast
Multicasts flow
from server to
client via Switches
1 and 4
goes down.
Switch 3 stops
blocking and
sends topology
change (TC)
TC and sends
Query Solicit (QS)
QS and sends
General Query (GQ)
and responds with
Membership Report
Multicasts flow
from server to
client via Switches Multicast
1, 2, 3, and 4
Switch 1: Querier Switch 2: STP root
Switch 2: STP root
Switch 2: STP root
QS
Switch 1: Querier
GQ
Report
Switch 1: Querier Switch 2: STP root
Multicast Multicast
Multicast
Switch 3 Switch 4
Switch 3
TC
QS QS
GQ GQ
Report Report
Switch 3 Switch 4
Multicast
Multicast
GQ
Report
Multicast
igmp-qs.eps