Allied Telesis AT-8000S - page 91

Page 90
Allied Telesis AT-8000S Switch
Web Browser Interface User’s Guide
–Multiple STP — Enables Multiple STP on the device.
•BPDU Handling — Determines how BPDU packets are managed when STP is disabled on the port or
device. BPDUs are used to transmit spanning tree information. The possible field values are:
–Filtering — Filters BPDU packets when spanning tree is disabled on an interface.
–Flooding — Floods BPDU packets when spanning tree is disabled on an interface. This is the default
value.
•Path Cost Default Values — Specifies the method used to assign default path cost to STP ports. The
possible field values are:
–Short — Specifies 1 through 65,535 range for port path cost.
–Long — Specifies 1 through 200,000,000 range for port path cost. This is the default value.
The Bridge Settings section of the Spanning Tree Page contains the following fields:
•Priority — Specifies the bridge priority value. When switches or bridges are running STP, each is assigned a
priority. After exchanging BPDUs, the device with the lowest priority value becomes the Root Bridge. The
default value is 32768. The port priority value is provided in increments of 4096; the value range is 0-65535.
•Hello Time — Specifies the device Hello Time, in seconds. The Hello Time is the time interval during which a
Root Bridge waits between configuration messages. The value range is 1-10 seconds; the default value is
2 seconds.
•Max Age — Specifies the device Maximum Age Time, in seconds. The Maximum Age Time is the time
interval during which a bridge waits before sending configuration messages. The value range is 6-40
seconds; the default value is 20 seconds.
•Forward Delay — Specifies the device Forward Delay Time, in seconds. The Forward Delay Time is the time
interval during which a bridge remains in the listening-and-learning state before forwarding packets.
The value range is 4-30 seconds; the default value is 15 seconds.
The Designated Root section of the Spanning Tree Page contains the following fields:
•Bridge ID — Identifies the Bridge priority and MAC address.
•Root Bridge ID — Identifies the Root Bridge priority and MAC address.
•Root Port — Indicates the port number that offers the lowest cost path from this bridge to the Root Bridge.
This field is significant when the bridge is not the Root Bridge. The default is zero.
•Root Path Cost — The cost of the path from this bridge to the Root Bridge.
•Topology Changes Counts — Specifies the total amount of STP state changes that have occurred.
•Last Topology Change — Indicates the time interval that has elapsed since the bridge was initialized or
reset, and the last topographic change that occurred. The time is displayed in a day-hour-minute-second
format, such as 2 days 5 hours 10 minutes and 4 seconds.
2. Complete the Spanning Tree State and Bridge Settings fields.
3. Click Apply. The new STP definition is added and device information is updated.
4. Click Save Config on the menu to save the settings permanently.