Notes On Igmp Snooping And Mld Snooping Usage - Alaxala AX2200S Series Configuration Manual

24.5 Notes on IGMP snooping and MLD snooping usage

(1) Notes on use with other functionality
For details, see 15.3 Compatibility between Layer 2 switch functionality and other
functionality.
(2) Control packet flooding
Because multicast traffic that is subject to suppression by IGMP snooping or MLD snooping
is data traffic, flooding needs to be performed within a VLAN so that the routing protocol
and other control packets can be received by all routers and all hosts. Therefore, the Switch
forwards packets with destination IP addresses contained in the address ranges shown in
the table below to all ports on the VLAN. Packets with destination IP addresses outside the
address ranges shown in the following table are forwarded according to learning results for
multicast MAC addresses.
Table 24-6 Control packet flooding
Protocol
IGMP Snooping
MLD Snooping
Note that multicast group addresses that duplicate multicast MAC addresses for control
packets cannot be used. The following table lists multicast group addresses that cannot be
used for addresses outside the address ranges shown in the above table.
Table 24-7 Multicast group addresses that cannot be used with the MAC address control
Protocol
IGMP Snooping
Address range
224.0.0.0 to 224.0.0.255
ff02::/16
method
Multicast group address
224.128.0.0/24
225.0.0.0/24
225.128.0.0/24
226.0.0.0/24
226.128.0.0/24
227.0.0.0/24
227.128.0.0/24
228.0.0.0/24
228.128.0.0/24
229.0.0.0/24
229.128.0.0/24
24 Description of IGMP Snooping and MLD Snooping
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