TP-Link TL-SG3424P manual Version, Hello Time, Max Age, Forward Delay, TxHold Count, Max Hops

Figure 7-4 STP Config

The following entries are displayed on this screen:

¾Global Config

STP:	Select Enable/Disable STP function globally on the switch.
Version:	Select the desired STP version on the switch.
	z	STP: Spanning Tree Protocol.
	z	RSTP: Rapid Spanning Tree Protocol.
	z	MSTP: Multiple Spanning Tree Protocol.

¾Parameters Config

CIST Priority:Enter a value from 0 to 61440 to specify the priority of the switch

for comparison in the CIST. CIST priority is an important criterion on determining the root bridge. In the same condition, the switch with the highest priority will be chosen as the root bridge. The lower value has the higher priority. The default value is 32768 and should be exact divisor of 4096.

Hello Time	Enter a value from 1 to 10 in seconds to specify the interval to
	send BPDU packets. It is used to test the links. 2*(Hello Time + 1)
	≤ Max Age. The default value is 2 seconds.
Max Age:	Enter a value from 6 to 40 in seconds to specify the maximum
	time the switch can wait without receiving a BPDU before
	attempting to reconfigure. The default value is 20 seconds.
Forward Delay:	Enter a value from 4 to 30 in seconds to specify the time for the
	port to transit its state after the network topology is changed.
	2*(Forward Delay-1) ≥ Max Age. The default value is 15 seconds.
TxHold Count:	Enter a value from 1 to 20 to set the maximum number of BPDU
	packets transmitted per Hello Time interval. The default value is
	5pps.
Max Hops:	Enter a value from 1 to 40 to set the maximum number of hops
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