Allied Telesis AT-S41 - Manual (Page 85)

AT-S41 User’s Guide
85
Enable/Disable [S]TP
Enables and disables STP on the switch. The default setting is
disabled.
Set Bridge Pr[i]ority
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 65535, with 0 being the highest
priority.
The default value for bridge priority on the AT-8350GB is 8000.
The current bridge priority is displayed in the Bridge ID field on
the Spanning Tree Configuration Menu and is followed by the
switch’s MAC address.
Bridge [H]ello Time
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.
Bridge Maximum [A]ge
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.
Bridge Forwarding [D]elay
The waiting period before a bridge changes to a new state, for
example, becomes the new root bridge after the topology
changes. If the bridge transitions too soon, not all links may have
yet adapted to the change, resulting in network loops. The default
is 15 seconds.
Spanning Tree [P]ort Configuration
Allows configuration of Port Priority, Path Cost, Trunk Priority, and
Trunk Path Cost. Refer to the next section for instructions on how
to configure these parameters.