Dell PowerConnect 3248 Manual page 28

28 Addendum to the 32 48 and 5 224 User 's Guides
• Forward Delay — The maximum time, in seconds, the switch waits
before changing states (such as, discarding to learning to forwarding).
This delay is required because every device must receive information
about topology changes before it starts to forward frames. In addition,
each port needs time to listen for conflicting information that would
make it return to a discarding state; otherwise, temporary data loops
might result.
– Default: 15
– Minimum: The higher of 4 or [(Max. Message Age / 2) + 1]
– Maximum: 30
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The following figure is representative of PowerConnect 3248 and 5224.