ZyXEL Communications ES 3500 Series Troubleshooting Manual page 71

Ensure that the Zyxel switch using MVR is the active querier.
When two devices have querier mode enabled, the device with the lower IP
address will assume the role of the active querier. In this case, we can configure the
interface IP address of the IGMP querier to the lowest possible IP address in the
network.
Using Web GUI:
Figure 10 Basic Setting > IP Setup
Using CLI:
Figure 11
In this example, the network in VLAN 1 is 10.251.30.0/24. Configuring the IP
address to 10.251.30.1 will ensure that this device will be the active querier in
VLAN 1.
After reconfiguring the IP address of the IGMP querier's interface, repeat step 2.
Access the Zyxel switch using MVR. Go to step 3.
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