Description: This object controls whether cut-thru is enabled on the stack.

Enabling cut-through can help to minimise the delay experienced

by packets before they are forwarded to their destination.

Setting the mode to 'fastForward' causes frame forwarding to

begin as soon as 32 bytes of the frame have been received.

Setting it to 'fragmentFree' causes frame forwarding to begin

when 64 bytes have been received. This is slower, but eliminates

the risk of forwarding an illegally short frame to the

destination port, however a valid length frame might still be

forwarded even though it had a CRC error. Setting this object to

'storeAndForward' disables the cut-through completely, and

frames will not be forwarded until they have been received in

their entirety.

When the mode is set to intelligent, the effective switching

mode is set initially to fast forward. The switch then monitors

the total error rate of frames received on each port, and if it

exceeds, say 20 error frames a second, it changes the effective

mode for the port to store and forward. If the error rate then

drops to zero the effective mode is restored to fast forward.

The actual error rates may differ for different switches.

Whatever forwarding mode is selected, cut-through cannot operate

if the destination port is currently involved in 'cut-through'

from another port. In this case the device will process the

frame in store and forward mode.