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Should I enable IGMP multicast?
IGMP snooping helps to optimize multicast performance and is especially useful for bandwidth-intensive IP multicast applications such as online media streaming. IGMP snooping is enabled by default on your Nighthawk switch.
Can I block multicast?
Multicast traffic is blocked in the Layer-3 mode by default, but is forwarded by default in the Virtual Wire mode. Multicast traffic transiting through the firewall can now be blocked, by either blocking the entire global multicast IP address range 224.0. 0.0/4, or by blocking PIM and IGMP under the security rule.
Should I disable IGMP Snooping?
Even if the switch or router offers the multicast IGMP Snooping feature, it should remain off to prevent unnecessary eavesdropping.
What does a multicast router do in IGMP?
In IGMP the multicast router is a member of EVERY multicast group, and receives all data sent to any multicast address.
How does IGMP filter control access to a port?
IGMP traffic filters control the access of a port to multicast traffic. Access can be restricted based on the following: • Which multicast groups or channels can be joined on a port. Channels are joined by IGMPv3 hosts that specify both the group and the source of the multicast traffic.
How is IGMP snooping used in multicast filtering?
IGMP snooping looks at IGMP traffic to decide which ports should be allowed to receive multicast traffic from certain sources and for certain groups. This information is used to forward multicast traffic to only interested ports. The main benefit of IGMP snooping is to reduce flooding of packets.
How to control the propagation of IGMP traffic?
For information about IGMP snooping, see “Understanding IGMP Filtering” section . IGMP filtering allows users to configure filters on a switch virtual interface (SVI), a per-port, or a per-port per-VLAN basis to control the propagation of IGMP traffic through the network.