[WEBINAR] Application Acceleration: Faster Performance for End Users

Cut-Through Switching

Definition - What does Cut-Through Switching mean?

Cut-through switching is a switching method used in packet-switching systems where the switch forwards packets or frames to its destination immediately after the destination address has been processed without waiting for the entire data to be received.

The switch immediately transmits packets it receives and uses CRC checks for error checking and then relies on the destination devices for error handling of the transmitted corrupted data which it has marked. In this case, the switch can be considered as a mere forwarder of data packets and offers low-latency performance as a result.

Techopedia explains Cut-Through Switching

Cut-through switching offers low-latency performance for SCSI traffic and is used primarily in Fiber Channels. Cut-through switches perform cyclic redundancy checks on incoming packets and marks corrupted frame EOF field as invalid. The destination devices see the invalid flag and drop the frame before it reaches the application. This is a reliable error-handling method which minimizes the time to recover bad frames because the recovery can start immediately compared to the "store and forward" method, which forces a SCSI timeout at the switch where the bad frame is detected. The SCSI retry for recovery would cost another few seconds of waiting.

Cut-through switching is primarily used in Fiber Channel because the reliability of destination-based error handling is mandated by the standards driven by the Technical Committee T11, which imposes Fiber Channel standards.

Techopedia Deals

Connect with us

Techopedia on Linkedin
Techopedia on Linkedin
"Techopedia" on Twitter

Sign up for Techopedia's Free Newsletter!

Email Newsletter

Join thousands of others with our weekly newsletter

Free Whitepaper: The Path to Hybrid Cloud
Free Whitepaper: The Path to Hybrid Cloud:
The Path to Hybrid Cloud: Intelligent Bursting To Amazon Web Services & Microsoft Azure
Free E-Book: Public Cloud Guide
Free E-Book: Public Cloud Guide:
This white paper is for leaders of Operations, Engineering, or Infrastructure teams who are creating or executing an IT roadmap.
Free Tool: Virtual Health Monitor
Free Tool: Virtual Health Monitor:
Virtual Health Monitor is a free virtualization monitoring and reporting tool for VMware, Hyper-V, RHEV, and XenServer environments.
Free 30 Day Trial – Turbonomic
Free 30 Day Trial – Turbonomic:
Turbonomic delivers an autonomic platform where virtual and cloud environments self-manage in real-time to assure application performance.