Permits or denies packets with certain IPv4 TCP port ranges, theĬut-through switch examines 54 bytes before it makes a forwardingĭecision. The switch does not move from one mode to the other asĭictated by configuration, speed differential, congestion, or anyįor example, in the case of a configuration that As stated earlier,Ĭut-through switches usually receive a predetermined number of bytes,ĭepending on the type of packet coming in, before making a forwarding Switches do not necessarily have cut-throughĪnd store-and-forward "modes" of operation. In this article from Cisco you will find more information on this subject and more specificaly this paragraph : However most cut-trough switches will examine more than the single destination address field prior to decide to forward it. So each vendor implement it on its own way and there's not a single answer to this question.īeginning to forward the frame immediately after the destination mac address has been read doesn't prevent the switch to read the source mac while transmitting it, this could be a way to learn it with an optimal latency. Actually it violates the 802.1D standard in some (minor) aspects.
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