Command Reference Guide

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Current root MAC address
Path-Cost
Port
Hello interval
Maximum age value
Forwarding delay
Aging time
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
Parameter
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.
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.
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.