User`s guide

AT-S45 User’s Guide
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The window displays the current STP operating parameters in two
columns labeled Designated Root and Bridge ID. The column
labeled Designated Root displays the STP parameters from the
root bridge. The parameters in the Bridge ID column are from the
AT-9410GB switch you are currently managing.
3. Adjust the bridge STP settings as needed. The commands for setting
the parameters are described below.
Enable/Disable [S]TP
Enables and disables STP on the switch. The default setting is
disabled.
Set Bridge Pr[i]ority
Sets the priority number for the bridge. This number is used in
determining the root bridge for STP. The bridge with the lowest
priority number is selected as the root bridge. If two or more
bridges have the same priority value, the bridge with the
numerically lowest MAC address becomes the root bridge. When
a root bridge goes off-line, the bridge with the next priority
number automatically takes over as the root bridge. This
parameter can be from 0 (zero) to 65,535, with 0 being the highest
priority.
The default value for bridge priority for an AT-9410GB switch is
8000. The current value for the unit is displayed in the Bridge ID
field in the window and is followed by the MAC address (i.e.,
Bridge ID: 8000 0030AB000920).
Set Bridge [H]ello Time
Sets the time interval between generating and sending
configuration messages by the bridge. This parameter can be
from 1 to 10 seconds. The default is 2 seconds.
Set Bridge Maximum [A]ge
Sets the length of time after which stored bridge protocol data
units (BPDUs) are deleted by the bridge. All bridges in a bridged
LAN use this aging time to test the age of stored configuration
messages called bridge protocol data units (BPDUs). For example,
if you use the default 20, all bridges delete current configuration
messages after 20 seconds. This parameter can be from 6 to 40
seconds. The default is 20 seconds.
Note
The aging time for BPDUs is different from the aging time used by
the MAC address table.