D-Link DGS-3308FG Product Manual - Page 185

STP Port Settings

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8-port Gigabit Ethernet Switch User's Guide Figure 7-39. STP Group Configuration - Edit screen Items on the screen above include: • Group Name - The group name of the Spanning Tree group being edited. • Status - Allows STP to be Enabled or Disabled. • Max Age: [6..40 sec] - The maximum time (in seconds) a device can wait without receiving a configuration message before attempting to reconfigure. All device ports (except for designated ports) should receive configuration messages at regular intervals. Any port that ages out STP information (provided in the last configuration message) becomes the designated port for the attached LAN. If it is a root port, a new root port is selected from among the device ports attached to the network. The minimum value is the higher of 6 or [2 x (Hello Time +1)]. The maximum value is the lower of 40 or [2 x (Forward Delay -1)]. • Hello Time: [1..10 sec] - The time interval (in seconds) at which the root device transmits a configuration message. • Forward Delay:[4..30 sec] - The maximum time (in seconds) the root device will wait before changing states (i.e., from the listening to learning to forwarding). This delay is required because every device must receive information about topology changes before it starts to forward packets. In addition, each port needs time to listen for conflicting information that would make it return to a blocking state; otherwise, temporary data loops might result. Maximum value is 30 Minimum value is 4 [(Max. Age/ 2) +1] • Priority:[0..65535] - Device priority used in selecting the root device, root port, and designated port. The device with the highest priority becomes the STP root device. The lower the numeric value, the higher the priority. If all devices have the same priority, the device with the lowest MAC address will become the root device. • Port Member - Check the ports you want to be member of the STP group. STP Port Settings The following window is used to configure the current STP port settings on the Switch. 175

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8-port Gigabit Ethernet Switch User’s Guide
175
Figure 7-39.
STP Group Configuration - Edit screen
Items on the screen above include:
•
Group Name
– The group name of the Spanning Tree group being edited.
•
Status
– Allows STP to be
Enabled
or
Disabled
.
•
Max Age: [6..40 sec]
– The maximum time (in seconds) a device can wait without receiving a configuration
message before attempting to reconfigure. All device ports (except for designated ports) should receive
configuration messages at regular intervals. Any port that ages out STP information (provided in the last
configuration message) becomes the designated port for the attached LAN. If it is a root port, a new root port is
selected from among the device ports attached to the network.
The minimum value is the higher of 6 or [2 x (Hello Time +1)].
The maximum value is the lower of 40 or [2 x (Forward Delay –1)].
•
Hello Time: [1..10 sec]
– The time interval (in seconds) at which the root device transmits a configuration
message.
•
Forward Delay:[4..30 sec]
– The maximum time (in seconds) the root device will wait before changing states
(i.e., from the listening to learning to forwarding). This delay is required because every device must receive
information about topology changes before it starts to forward packets. In addition, each port needs time to listen
for conflicting information that would make it return to a blocking state; otherwise, temporary data loops might
result.
Maximum value is 30
Minimum value is 4 [(Max. Age/ 2) +1]
•
Priority:[0..65535]
– Device priority used in selecting the root device, root port, and designated port. The device
with the highest priority becomes the STP root device. The lower the numeric value, the higher the priority. If all
devices have the same priority, the device with the lowest MAC address will become the root device.
•
Port Member
– Check the ports you want to be member of the STP group.
STP Port Settings
The following window is used to configure the current STP port settings on the Switch.