Alaxala AX2200S Series Configuration Manual page 467

with the router might change due to topology changes by a Spanning Tree Protocol, a
multicast router port must be set for all ports that might connect with the router.
(b) Connections between Layer 2 switches
On VLANs that contain only multiple Layer 2 switches, a multicast router port must be set
for ports connecting to Layer 2 switches handling multicast traffic transmission hosts. In
such a configuration, enable the IGMP snooping and MLD snooping functionality on each
Layer 2 switch (connect to the switches that support snooping).
When a redundant configuration is used, a multicast router port must be set for all ports that
might connect to Layer 2 switches handling transmission hosts.
(4) Connections with IGMP version 3 hosts
The Switch does not support IGMP version 3 (abbreviated hereafter to IGMPv3). If the
IGMP snooping functionality is used, data packets are not forwarded because the Switch
does not recognize a membership request for joining to an IGMPv3 group. When
connecting to an IGMPv3 host, disable the IGMP snooping functionality on the host.
(5) Connections with MLD version 2 hosts
When connecting an MLDv2 host to the Switch, make sure that you connect an MLDv2
router and set an IP address so that the router becomes the representative querier. If the
representative querier is an MLDv1 router, the network will operate in MLDv1 mode.
Use a configuration in which MLDv2 messages from MLDv2 hosts are not split into
fragments.
24 Description of IGMP Snooping and MLD Snooping
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