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You can also refer to the following port-specific RSTP information:
• Port number and priority
• Cost
• State
• Role
• Designated bridge and port
• Link type
The following table describes the STP parameters in RSTP or MSTP mode.
Table 24 Rapid Spanning Tree parameter descriptions
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. 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. A setting of
zero (0) indicates that the cost will be set to the appropriate default after the link speed
has been auto-negotiated.
State
Shows the current state of the port. The State field in RSTP/MSTP mode can be one of
the following: Discarding (DISC), Learning (LRN), Forwarding (FWD), or Disabled
(DSB).