D-Link DES-3526 Manual page 61

NOTE: The Hello Time cannot be longer than the Max. Age. Otherwise, a
configuration error will occur. Observe the following formulas when setting the
above parameters:
Max. Age = 2 x (Forward Delay - 1 second)
Max. Age = 2 x (Hello Time + 1 second)
The following parameters can be set:
Parameter
STP Status
STP Version
Hello Time (1 - 10 Sec) <2>
Max Age (6 - 40 Sec) <20>
DES-3526 / DES-3526DC Fast Ethernet Layer 2 Switch
Figure 6- 20. STP Bridge Global Settings window
Description
MST Configuration Identification
Use the pull-down menu to enable or disable STP globally on the Switch.
The default is Disabled.
Use the pull-down menu to choose the desired version of STP to be
implemented on the Switch. There are three choices:
STP - Select this parameter to set the Spanning Tree Protocol (STP)
globally on the switch.
RSTP - Select this parameter to set the Rapid Spanning Tree Protocol
(RSTP) globally on the Switch.
MSTP - Select this parameter to set the Multiple Spanning Tree Protocol
(MSTP) globally on the Switch.
The Hello Time can be set from 1 to 10 seconds. This is the interval
between two transmissions of BPDU packets sent by the Root Bridge to
tell all other switches that it is indeed the Root Bridge. This field will only
appear here when STP or RSTP is selected for the STP Version. For
MSTP, the Hello Time must be set on a port per port basis. See the MST
Port Settings section for further details.
The Max Age may be set to ensure that old information does not endlessly
circulate through redundant paths in the network, preventing the effective
propagation of the new information. Set by the Root Bridge, this value will
aid in determining that the Switch has spanning tree configuration values
consistent with other devices on the bridged LAN. If the value ages out
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