Tiếng Việt
1. What is IGMP?
IGMP is an acronym for Internet Group Management Protocol is a protocol that allows several devices to share one IP address so that they can all receive the same data. IGMP is a network layer protocol used to establish multicasting on networks using Internet Protocol version 4 (IPv4). Specifically, IGMP allows devices to join a multicasting group.
2. What is Multicasting?
Multicasting is when a group of devices all receive the same messages or packets. Multicasting works by sharing IP addresses between multiple devices. Any network traffic directed to that IP address will reach all devices that share the IP address, instead of just one. This is like when a group of employees all receive the company email directed to a certain email alias.
3. How IGMP works
Computers and other devices connected to the network use IGMP when they want to join a multicast group. IGMP enabled routers listen for IGMP traffic from devices to find out which device belongs to which multicast group.
What is IGMP snooping?
IGMP is a network layer protocol and only network devices that are aware of the network layer can send and receive messages. Routers operate at the network layer, while a network switch may know only layer 2, also known as the data link layer.
As a result, a network switch may not know which network devices have joined or not joined the multicast group. It can end up forwarding multicast traffic to devices that don’t need it, which takes up network bandwidth and device processing power, slowing down the entire network.
IGMP snooping solves this problem by enabling switches to “snoop” on IGMP messages. Normally, a layer 2 switch would not be aware of IGMP messages, but they can listen for these messages through IGMP snooping. This allows them to specify where multicast messages should be forwarded, so that only the correct devices receive the multicast traffic.
4. Enable IGMP on TP-Link device
To activate, do the following:
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