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DES-3326 Layer 3 Fast Ethernet Switch User’s Guide
The following fields can be set:
Parameter Default Description
Status:<Enabled> Enabled Allows the STP to be globally Enabled or Disabled on the
switch.
Max Age
20
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
2
The time interval (in seconds) at which the root device
transmits a configuration message.
Forward Delay
15
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 the higher of 4 or [(Max. Age / 2) +1]
Priority
32,768
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.
Range 0 to 65535.
STP Group
:<Default>
Default
Allows the selection of one of the STP Groups previously
configured on the switch
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