Adaptive switching

From Academic Kids

Adaptive switching mode is a user-defined facility to maximize the efficiency of the switch. Adaptive switching starts in the default switch forwarding mode you have selected (cut-through if you selected adaptive mode as the default switching mode). Depending on the number of runts and CRC errors at that port, the mode changes to the "best" of the other two switching modes. As the numbers of runts and CRC errors change, so does the forwarding mode.

This is best illustrated by the table below:

Switching mode: Defects: Then, adaptive mode changes
the switching mode to:
Cut-through High numbers of CRC errors Store-and-forward
High numbers of runts Fragment-free
Fragment-free High numbers of CRC errors Store-and-forward
Low numbers of runts Cut-through
Store-and-forward Low numbers of CRC errors Fragment-free
Low numbers of CRC errors and runts Cut-through

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