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You can also refer to the following port-specific STP information:
• Port number and priority
• Cost
• State
• Port Fast Forwarding state
• Designated bridge
• Designated port
The following table describes the STP parameters.
Table 22
STP parameters
Parameters Description
Current Root
Shows information about the root bridge for the Spanning Tree. Information
includes the priority (hex) and MAC address of the root.
Path-Cost
Path-cost is the total path cost to the root bridge. It is the summation of the path
cost between bridges (up to the root bridge).
Port
The current root port refers to the port on the switch that receives data from the
current root. Zero (0) indicates the root bridge of the STP.
Priority (bridge)
The bridge priority parameter controls which bridge on the network will become
the STP root bridge.
Hello
The hello time parameter specifies, in seconds, how often the root bridge transmits
a configuration bridge protocol data unit (BPDU). Any bridge that is not the root
bridge uses the root bridge hello value.
MaxAge
The maximum age parameter specifies, in seconds, the maximum time the bridge
waits without receiving a configuration bridge protocol data unit before it
reconfigures the STP network. If the bridge is not the root bridge, it uses the
MaxAge value of the root bridge.
FwdDel
The forward delay parameter specifies, in seconds, the amount of time that a
bridge port has to wait before it changes from learning state to forwarding state. If
the bridge is not the root bridge, it uses the FwdDel value of the root bridge.
Aging
The aging time parameter specifies, in seconds, the amount of time the bridge
waits without receiving a packet from a station before removing the station from
the Forwarding Database.
Priority (port)
The port priority parameter helps determine which bridge port becomes the
designated port. In a network topology that has multiple bridge ports connected to
a single segment, the port with the lowest port priority becomes the designated
port for the segment.
Cost
The port path cost parameter is used to help determine the designated port for a
segment. Generally speaking, the faster the port, the lower the path cost.
State
The State field shows the current state of the port. The State field can be one of the
following: BLOCKING, LISTENING, LEARNING, FORWARDING, or DISABLED.
Designated bridge
Shows information about the bridge connected to each port, if applicable.
Information includes the priority (hex) and MAC address of the Designated Bridge.
Designated port
The port ID of the port on the Designated Bridge to which this port is connected.
This information includes the port priority (hex) and the port number (hex).