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As a result, IGMP snooping switches may collapse IP multicast group memberships into a
single Ethernet multicast membership group.
In addition to building and maintaining lists of multicast group memberships, the
snooping switch must also maintain a list of multicast routers. When multicast packets
are forwarded, the packets should be forwarded not only on ports that have expressed
joins using IGMP but also on ports to which multicast routers are attached.
NOTES:
• Do not assign reserved multicast IP addresses to a DM NVX device for streaming.
For additional information, go to
https://www.iana.org/assignments/multicast-addresses/multicast-addresses.txt.
• Multicast collision is a concern with IPv4. For example, multicast IPv4 addresses
224.8.7.6 and 229.136.7.6 translate to the same MAC address (01:00:5E:08:07:06).
The following items provide recommendations for configuration of a network switch for
IGMP snooping:
• Set the IGMP query interval to 60 seconds or 125 seconds. The recommended
setting is the default setting of the network switch.
• For good network performance, ensure that there is only one IGMP querier in the
network.
• Set IGMP snooping to v2 or v3.
• Enable IGMP snooping globally as well as for each specific VLAN for DM NVX
connected ports.
• Configure the network switch to drop unknown multicast packets.
• If the network switch supports IGMP fast leave, enable the configuration at the
port, global, or VLAN level.
• If the network switch supports PIM snooping, enable the configuration to prevent
flooding IP multicast traffic toward multicast router (mrouter) ports.
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