D-Link DES-1228/ME User Manual page 106

TX Hold Count (1-10)
Forwarding BPDU
Loopback Detection
LBD Recover Time
(0:Disable)
Click Apply to implement changes made.
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)
DES-1228/ME Layer 2 Fast Ethernet Managed Switch
on the Switch.
MSTP − Select this parameter to set the Multiple Spanning Tree Protocol (MSTP)
globally on the Switch
Used to set the maximum number of Hello packets transmitted per interval. The count
can be specified from 1 to 10. The default is 6.
This field can be Enabled or Disabled. When Enabled, it allows the forwarding of STP
BPDU packets from other network devices. The default is Enabled.
This feature is used to temporarily block STP on the Switch when a BPDU packet has
been looped back to the switch. When the Switch detects its own BPDU packet coming
back, it signifies a loop on the network. STP will automatically be blocked and an alert
will be sent to the administrator. The LBD STP port will restart (change to discarding
state) when the Loopback Detection Recover Time times out. The user may enable or
disable this function using the pull-down menu.
This field will set the time the STP port will wait before recovering the STP state set. 0
will denote that the LBD will never time out or restart until the administrator personally
changes it. The user may also set a time between 60 and 1000000 seconds. The default
is 60 seconds.
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