Allied Telesis AT-GS950/8 - Manual (Page 82)

Chapter 4: STP and RSTP
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The Spanning Tree Protocol Settings page allows you to configure
global STP or RSTP protocols, as well as to view current settings of
the feature.
4. In the upper portion of the page, you can set the following parameters:
Global STP Status - Use this menu to activate or de-activate the
STP or RSTP feature on the switch. From the Global STP Status
pull-down menu at the top of the page, select one of the following
choices:
Enable - The STP or RSTP feature is active. The other
parameters on the web page become active and are eligible for
data to be entered.
Disable - The STP or RSTP feature is inactive. The other
parameters on the web page become inactive and are greyed
out so that data cannot be entered.
Protocol Version - Select STP or RSTP to set STP or RSTP on
the switch. You can also select MSTP. For information on MSTP,
refer to Chapter 5, “Multiple Spanning Tree Protocol” on page 87.
Bridge Priority - The priority number for the bridge. This number
is used to determine the root bridge for RSTP. The bridge with the
lowest priority number is selected as the root bridge. If two or more
bridges have the same priority value, that is, the lowest value of all
the other bridges, then the bridge with the numerically lowest MAC
address becomes the root bridge. When a root bridge goes offline,
the bridge with the lowest priority number automatically takes over
as the root bridge. The bridge priority has a range of 0 to 61440 in
increments of 4096, with 61440 being the highest priority.
Maximum Age - The length of time after which stored bridge
protocol data units (BPDUs) are deleted by the bridge.
Hello Time - This is the time interval between generating and
sending configuration messages by the bridge. This parameter is
active only when the switch is the root bridge.
Forward Delay - This is the time interval between generating and
sending configuration messages by the bridge.
Transmit Hold Count - Applies only to MSTP. For information on
MSTP, refer to Chapter 5, “Multiple Spanning Tree Protocol” on
page 87.
Max Hop Count - Applies only to MSTP. For information on
MSTP, refer to Chapter 5, “Multiple Spanning Tree Protocol” on
page 87.