Milan Technology MIL-SM2401M-STK - Manual (Page 184)

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Hello Time: The number of seconds between the transmission of
Spanning-Tree Protocol configuration messages. Enter a number 1 through 10.
Forward Delay Time: The number of seconds a port waits before changing
from its Spanning-Tree Protocol learning and listening states to the forwarding
state. Enter a number 4 through 30.
Click the Apply button to save the new configuration.