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>> Table: dot1dStp - (.1.3.6.1.4.1.272.4.8.2)

dot1dStp
OIDNameTypeAccess
.1ProtocolSpecificationENUMR
.2PriorityINTEGERRW
.3TimeSinceTopologyChangeTimeTicksR
.4TopChangesCounterR
.5DesignatedRootBridgeIdR
.6RootCostINTEGERR
.7RootPortINTEGERR
.8MaxAgeTimeoutR
.9HelloTimeTimeoutR
.10HoldTimeINTEGERR
.11ForwardDelayTimeoutR
.12BridgeMaxAgeINTEGERRW
.13BridgeHelloTimeINTEGERRW
.14BridgeForwardDelayINTEGERRW
.16BridgePPPForwardDelayINTEGERRW

ProtocolSpecification
An indication of what version of the Spanning

Tree Protocol is being run.  The value

'decLb100(2)' indicates the DEC LANbridge 100

Spanning Tree protocol.  IEEE 802.1d

implementations will return 'ieee8021d(3)'.  If

future versions of the IEEE Spanning Tree Protocol

are released that are incompatible with the

current version a new value will be defined.
Enumerations:
  • unknown (1)
  • decLb100 (2)
  • ieee8021d (3)
Priority
The value of the write-able portion of the Bridge

ID, i.e., the first two octets of the (8 octet

long) Bridge ID.  The other (last) 6 octets of the

Bridge ID are given by the value of

dot1dBaseBridgeAddress.
TimeSinceTopologyChange
The time (in hundredths of a second) since the

last time a topology change was detected by the

BRICK.
TopChanges
The total number of topology changes detected by

the BRICK since the management entity was last

reset or initialized.
DesignatedRoot
The bridge identifier of the root of the spanning tree

as determined by the Spanning Tree Protocol as executed

by the BRICK. This value is used as the Root Identifier

parameter in all Configuration Bridge PDUs originated

by this BRICK.
RootCost
The cost of the path to the root as seen from

the BRICK.
RootPort
The port number of the port which offers the

lowest cost path from this bridge to the root

bridge.
MaxAge
The maximum age of Spanning Tree Protocol

information learned from the network on any port

before it is discarded, in units of hundredths of

a second.  This is the actual value that the 

BRICK is currently using.
HelloTime
The amount of time between the transmission of 

Configuration bridge PDUs by the BRICK on any port when

it is the root of the spanning tree or trying to become so,

in units of hundredths of a second. This is the actual 

value currently being used.
HoldTime
This time value determines the interval length

during which no more than two Configuration bridge

PDUs shall be transmitted by this node, in units

of hundredths of a second.
ForwardDelay
This time value, measured in units of hundredths of a

second, controls how fast a port changes its spanning

state when moving towards the Forwarding state. The

value determines how long the port stays in each of the

Listening and Learning states, which precede the 

Forwarding state. This value is also used, when a topology

change has been detected and is under way, to age all 

dynamic entries in the Forwarding Database.

[Note that this value is the one that is currently being

used, in contrast to dot1dStpBridgeForwardDelay which is

the value that this BRICK and all others would start 

using if/when this BRICK were to become the root.]
BridgeMaxAge
The value that all bridges use for MaxAge when

this bridge is acting as the root.  Note that

802.1D-1990 specifies that the range for this

parameter is related to the value of

dot1dStpBridgeHelloTime. The granularity of this

timer is specified by 802.1D-1990 to be 1 second.

An agent may return a badValue error if a set is

attempted to a value which is not a whole number

of seconds.
BridgeHelloTime
The value that all bridges use for HelloTime when

this bridge is acting as the root.  The

granularity of this timer is specified by 

802.1D-1990 to be 1 second.  An agent may return a

badValue error if a set is attempted to a value

which is not a whole number of seconds.
BridgeForwardDelay
The value that all bridges use for ForwardDelay

when this bridge is acting as the root.  Note that

802.1D-1990 specifies that the range for this

parameter is related to the value of

dot1dStpBridgeMaxAge.  The granularity of this

timer is specified by 802.1D-1990 to be 1 second.

An agent may return a badValue error if a set is

attempted to a value which is not a whole number

of seconds.
BridgePPPForwardDelay
This is the forward delay for PPP interfaces.


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