Optimized IGMP for Efficient Video Multicasting
in Large-Scale IP Surveillance Networks!

With the growing importance of surveillance in large scale networks, IP multicast networking is becoming more extensively used for video distribution, conference calling etc. To ensure efficient video stream transmission in networks, where a lot of multicast data is available, a switch is required to have IGMP protocols.

Usually, IGMP Query is only supported by multicast enabled and relatively expensive Layer 3 Routers. Besides, most Layer 2 switches do not support IGMP snooping, which means that they do not have the capacity to handle a large table of IGMP Multicast traffic, so the multicast will easily flood everywhere where IGMP snooping is absent. As a result, the bandwidth utilization will be poor and the video quality very low, which is not acceptable for large scale surveillance networks.
Hence, to solve these issues, Korenix introduces the optimized IGMP protocol for providing reliable and high performance video transmission in IP surveillance network.

Complete Multicast Support To ensure an efficient video image transmission Korenix Layer 2 switches support both IGMP Query and IGMP Snooping. With IGMP Query protocol, Korenix replaces traditional expensive L3 switches with its cost-effective L2 switches. Besides, Korenix L2 switches, which support IGMP Snooping, can provide high quality video transmission. As a result, a single Layer 2 switch solves all the problems of network communication by providing a complete, end-to-end multicast management. The following image shows the simple diagram of efficient data transmission through Korenix switches, which support complete multicast management.

Optimized Performance
Traditional switches have limited IGMP Snooping design. This means that when a CPU snoops for IGMP, it does get video data, so it is overwhelmed by Multicast videos and can be too busy to manage the traffic. This results in poor bandwidth management, so the switch is not capable of supporting large scale surveillance systems.

Limited IGMP Snooping Design	Korenix optimized IGMP Snooping

Quite contrary to this, Korenix Layer 2 switches are specifically designed for providing an optimized IP surveillance solution with optimized IGMP technology. Here CPU snoops IGMP only and doesn’t get multicast videos along with the IGMP. Therefore, it will not lose time on managing multicast video traffic and will effectively manage the bandwidth and provide scalable and high video quality.

Seamless Restoration
To protect against network failure and to ensure the reliable video transmission, legacy IP surveillance networks use redundant technology. However, in the redundant network the topology change is inevitable. A topology change alters data flowing paths and requires IGMP snooping to relearn forwarding multicast traffics correctly. Before regaining correct multicast group information, multicast traffic is either lost or flooded everywhere, which prolongs system downtime and downgrades the quality of network service. The convergence procedure starts from next IGMP Report which can take up to one more IGMP query interval. This is not acceptable for mission-critical IP surveillance applications.

Korenix Layer 2 Switches have an error-free restoration procedure, Seamless Restoration, which provides fast convergence from topology change. Here, IGMP relearning process starts immediately once the topology is changed. By fast reacting to topology change, the convergence time is down to within a few seconds and multicast traffic can soon find its way to destination. The patented mechanism shortens the system downtime, eliminates any unstable status and guarantees the best quality and smooth video delivery.

The complete IGMP technology is applied to Korenix L2 managed products :

• JetNet series Industrial Managed Rackmount and DIN-rail Switches Click here!!
• JetPoE series Industrial Managed PoE switches Click here!!
• JetRock series Ethernet switches Click here!!
  

[To view Korenix product lines Click here!]