Spanning Tree
STP Status and Global Settings
246 Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
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• BPDU Handling—Select how Bridge Protocol Data Unit (BPDU) packets are
managed when STP is disabled on the port or the device. BPDUs are used to transmit
spanning tree information.
- Filtering—Filters BPDU packets when Spanning Tree is disabled on an interface.
- Flooding—Floods BPDU packets when Spanning Tree is disabled on an interface.
• Path Cost Default Values—Selects the method used to assign default path costs to the
STP ports. The default path cost assigned to an interface varies according to the selected
method.
- Short—Specifies the range 1 through 65,535 for port path costs.
- Long—Specifies the range 1 through 200,000,000 for port path costs.
Bridge Settings:
• Priority—Sets the bridge priority value. After exchanging BPDUs, the device with the
lowest priority becomes the Root Bridge. In the case that all bridges use the same
priority, then their MAC addresses are used to determine the Root Bridge. The bridge
priority value is provided in increments of 4096. For example, 4096, 8192, 12288, and
so on.
• Hello Time—Set the interval (in seconds) that a Root Bridge waits between
configuration messages.
• Max Age—Set the interval (in seconds) that the device can wait without receiving a
configuration message, before attempting to redefine its own configuration.
• Forward Delay—Set the interval (in seconds) that a bridge remains in a learning state
before forwarding packets. For more information, refer to STP Interface Settings.
Designated Root:
• Bridge ID—The bridge priority concatenated with the MAC address of the device.
• Root Bridge ID—The Root Bridge priority concatenated with the MAC address of the
Root Bridge.
• Root Port—The port that offers the lowest cost path from this bridge to the Root
Bridge. (This is significant when the bridge is not the root.)
• Root Path Cost—The cost of the path from this bridge to the root.
• Topology Changes Counts—The total number of STP topology changes that have
occurred.
• Last Topology Change—The time interval that elapsed since the last topology change
occurred. The time appears in a days/hours/minutes/seconds format.
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