Foundry NetIron M2404C and M2404F Metro Access Switches
Configuring STP (Rev. 03)
Spanning Tree Protocol (STP)
© 2008 Foundry Networks, Inc.
Page 29 of 38
Table 8: Parameters Displayed by STP Show Commands for All Interfaces
Parameter
Description
Port
The interface unit/slot/port.
Pri
The port priority, which is part of the port identifier.
State
The current state of the port (i.e., Disabled, Listening, Learning,
Forwarding, or Blocking).
PCost
The contribution of the path through this port, when the port is the
Root Port, to the total cost of the path to the Root for this Bridge.
This parameter is used, added to the value of the Designated Cost
parameter for the Root Port, as the value of the Root Path Cost
parameter offered in all Configuration BPDUs transmitted by the
Bridge, when it is not the Root.
DCost
The unique Bridge Identifier of the Bridge recorded as the Root in the
Root Identifier parameter of Configuration BPDUs transmitted by the
Designated Bridge for the LAN to which the Port is attached.
This parameter is used to test the value of the Root Identifier
parameter conveyed in received Configuration BPDUs.
Designated bridge
The unique Bridge Identifier of one of the following:
The Bridge to which the Port belongs, in the case of a Designated
Port.
The Bridge believed to be the Designated Bridge for the LAN to
which this port is attached.
This parameter is used:
Together with the Designated Port and Port Identifier parameters for
the Port to ascertain whether this port should be the Designated Port
for the LAN to which it is attached.
To test the value of the Bridge Identifier parameter conveyed in
received Configuration BPDUs.
DPrt
The Port Identifier of the Bridge Port, on the Designated Bridge,
through which the Designated Bridge transmits the Configuration
Message information stored by this port.
This parameter is used:
Together with the Designated Bridge and Port Identifier parameters
for the port to ascertain whether this Port should be the Designated
Port for the LAN to which it is attached.
By management to determine the topology of the Bridged LAN.
FwrdT
Number of port state transitions into forwarding state that have
occurred.
DtctTc
Set to record whether or not detection of topology changes is enabled
for the associated port. If change detection is disabled, changes in
topology detected by or notified to the Bridge via this port are ignored
from the point of view of communicating the topology change to the
Root.
The default state of this parameter shall be Enabled for all Ports of the
Bridge.