Layer 2 switches observe layer 3 IGMP traffic, and use this visibility to create a table that tracks multicast groups. IGMP snooping circumvents this limitation. A layer 2 switch does not process layer 3 protocols. The functions of networking equipment are limited by the layers that the equipment can interact with. Networking protocols and equipment are partially defined by which layer they belong to. The data link layer and the network layer are layers 2 and 3, respectively. The OSI model is one standard way to define the different networking layers. The processes that make the Internet work are divided into different layers. What is the network layer? What is the data link layer? Unlike a router, a switch does not forward packets between networks it only forwards packets within a network. What is a network switch?Ī network switch connects devices within a network and forwards data packets to and from those devices (also known as "hosts"). IGMP snooping is not a feature of the IGMP protocol, but is rather an adaptation built into some network switches. IGMP snooping is a way around this: it allows switches to "snoop" on IGMP messages, even though they technically belong to a different layer of the OSI model. However, most network switches cannot see which devices have joined multicasting groups, since they do not process network layer protocols. Networked devices use IGMP to join and leave multicasting groups, and each multicasting group shares an IP address.
The Internet Group Management Protocol (IGMP) is a network layer protocol that allows several devices to share one IP address so they can all receive the same data. It enables switches to forward packets to the correct devices in their network.
IGMP snooping is a method that network switches use to identify multicast groups, which are groups of computers or devices that all receive the same network traffic. Secure endpoints for your remote workforce by deploying our client with your MDM vendorsĮnhance on-demand DDoS protection with unified network-layer security & observabilityĬonnect to Cloudflare using your existing WAN or SD-WAN infrastructure Get frictionless authentication across provider types with our identity partnershipsĮxtend your network to Cloudflare over secure, high-performing links Integrate device posture signals from endpoint security programs We work with partners to provide network, storage, & power for faster, safer delivery We partner with leading cyber insurers & incident response providers to reduce cyber risk
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