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Intel® Gigabit Ethernet Switch AXXSW1GB User Guide 87
• 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. This is the default value.
— Flooding — Floods BPDU packets when spanning tree is disabled on an
interface.
• 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. This is the default
value.
— Long — Specifies 1 through 200,000,000 range for port path cost. The default
path cost assigned to an interface varies according to the selected method (Hello
Time, Max Age, or Forward Delay).
Bridge Settings
• 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 possible field range is 0 - 61440 seconds.
The default value is 32768. The bridge priority value is provided in increments of
4096.
• Hello Time — Specifies the device Hello Time. The Hello Time indicates the amount
of time in seconds a Root Bridge waits between configuration messages. The possible
field range is 1-10 seconds. The default is 2 seconds.
• Max Age — Specifies the device Maximum Age Time. The Maximum Age Time is
the amount of time in seconds a bridge waits before sending configuration messages.
The possible field range is 6 - 40 seconds. The default Maximum Age Time is
20
seconds.
• Forward Delay — Specifies the device Forward Delay Time. The Forward Delay
Time is the amount of time in seconds a bridge remains in a listening and learning
state before forwarding packets. The possible field range is 4 -30. The default is 15
seconds.
Designated Root
• 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 — Specifies 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 amount of time 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.