07-03-2014 12:41 AM - edited 03-07-2019 07:55 PM
07-03-2014 02:21 AM
Hi,
The switch 2960 always uses the store-and-forward method: complete packets are stored and checked for errors before transmission.
There is no need to configure the switching method. Most of the access switches will support "store-and-forward"
Example:
Store-and-forward
Cut-through
Regards,
Aru
*** Please rate if the post is useful ***
07-03-2014 02:32 AM
I would like to add below as well,
Starting in 5.1(3)n1(1), we have the ability to change the default behavior to store and forward with the following global command: hardware ethernet store-and-fwd-switching
Refer:
http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5548p-switch/qa_c67-618605.html
Regards,
Aru
07-03-2014 07:18 AM
07-03-2014 11:44 AM
Hi,
The first switches (made by Kalpana, who was later bought by Cisco). Kalpana was the first, and they did it with custom proprietary hardware.
The store-and-forward was much higher latency through the switch. Then Cisco came out with "Fragment Free" switching - meaning that the switch would accept the first 64 bytes, evaluate it, then forward it.
By getting at least 64 bytes, the switch could guarantee the the frame was not a runt (runt is a frame < 64bytes, the minimum permissable Ethernet frame size), and could make sure that the addresses were not corrupt.
I remember that the catalyst 1924 is set for fragment-free switching which was very old switch.
But presently the switches are operating with Store-and-forward and cut-through switching
Refer
https://supportforums.cisco.com/discussion/9796971/fragment-free-switch
Regards,
Aru
*** Please rate if the post is useful ***
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide