>> MIB - Management Information Base

>> Table: dot1dStpPortTable - (.1.3.6.1.4.1.272.4.8.2.15.1)

Description: A list of information maintained by every port about the Spanning Tree Protocol state for that port.

dot1dStpPortTable
OIDNameTypeAccess
.1IfIndexINTEGERR
.2NumberINTEGERR
.3PriorityINTEGERRW
.4StateENUMR
.5EnableENUMRW
.6PathCostINTEGERRW
.7DesignatedRootBridgeIdR
.8DesignatedCostINTEGERR
.9DesignatedBridgeBridgeIdR
.10DesignatedPortINTEGERR
.11ForwardTransitionsCounterR
.12BackupForIfIndexINTEGERRW

IfIndex
The value of the instance of the ifIndex object defined

in MIB-II, for the interface corresponding to this port.
Number
The number of the port.
Priority
The value of the priority field which is

contained in the first (in network byte order)

octet of the (2 octet long) Port ID.  The other

octet of the Port ID is given by the value of

dot1dStpPort.
State
The port's current state as defined by

application of the Spanning Tree Protocol.  This

state controls what action a port takes on

reception of a frame.  If the bridge has detected

a port that is malfunctioning it will place that

port into the broken(6) state.  For ports which

are disabled (see dot1dStpPortEnable), this object

will have a value of disabled(1).
Enumerations:
  • disabled (1)
  • blocking (2)
  • listening (3)
  • learning (4)
  • forwarding (5)
  • broken (6)
Enable
The enabled/disabled status of the port.At least two

ports must be enabled for bridging to be possible.
Enumerations:
  • enabled (1)
  • disabled (2)
PathCost
The contribution of this port to the path cost of

paths towards the spanning tree root which include

this port.  802.1D-1990 recommends that the

default value of this parameter be in inverse

proportion to the speed of the attached LAN.
DesignatedRoot
The unique Bridge Identifier of the Bridge

recorded as the Root in the Configuration BPDUs

transmitted by the Designated Bridge for the

segment to which the port is attached.
DesignatedCost
The path cost of the Designated Port of the

segment connected to this port.  This value is

compared to the Root Path Cost field in received

bridge PDUs.
DesignatedBridge
The Bridge Identifier of the bridge which this

port considers to be the Designated Bridge for

this port's segment.
DesignatedPort
The Port Identifier of the port on the Designated

Bridge for this port's segment.
ForwardTransitions
The number of times this port has transitioned

from the Learning state to the Forwarding state.
BackupForIfIndex
This port is used as a backup line

for the respective interface.


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