IEEE8021-SPANNING-TREE-MIB
AI MIB Summary
The IEEE8021-SPANNING-TREE-MIB enables monitoring and management of IEEE 802.1Q-compliant bridge devices by exposing Spanning Tree Protocol (STP) state variables, including port roles, bridge priorities, path costs, and topology change notifications. This module facilitates the tracking of loop prevention mechanisms and convergence events across Layer 2 network segments to ensure network stability and redundancy.
The Spanning-Tree MIB module for managing devices that support IEEE 802.1Q. This MIB module is derived from the IETF BRIDGE-MIB, RFC 4188.
Unless otherwise indicated, the references in this MIB module are to IEEE Std 802.1Q-2014.
Copyright (C) IEEE (2014). This version of this MIB module is part of IEEE802.1Q; see the draft itself for full legal notices.
Main OID:
ieee8021SpanningTreeMib.1.3.111.2.802.1.1.3
49
Objects
Active
Status
5
Dependencies
Imported Objects
Objects
49 total| Object Name |
|---|
ieee8021SpanningTreeMibThe Spanning-Tree MIB module for managing devices that
support IEEE 802.1Q. This MIB module is derived from the
IETF BRIDGE-MIB, RFC 4188.
Unless otherwise indicated, the references in this MIB
module are to IEEE Std 802.1Q-2014.
Copyright (C) IEEE (2014).
This version of this MIB module is part of IEEE802.1Q;
see the draft itself for full legal notices. MODULE-IDENTITY .1.3.111.2.802.1.1.3 |
ieee8021SpanningTreeNotifications OBJECT IDENTIFIER .1.3.111.2.802.1.1.3.0 |
ieee8021SpanningTreeNewRootThe ieee8021SpanningTreeNewRoot notification indicates that
the sending agent has become the new root of the Spanning Tree;
the notification is sent by a Bridge soon after its election
as the new root, e.g., upon expiration of the Topology Change
Timer, immediately subsequent to its election. NOTIFICATION-TYPE .1.3.111.2.802.1.1.3.0.1 |
ieee8021SpanningTreeTopologyChangeA ieee8021SpanningTreeTopologyChange notification is sent
by a Bridge when any of its configured ports transitions from
the Learning state to the Forwarding state, or from the
Forwarding state to the Blocking state. The notification
is not sent if a ieee8021SpanningTreeNewRoot notification
is sent for the same transition. NOTIFICATION-TYPE .1.3.111.2.802.1.1.3.0.2 |
ieee8021SpanningTreeObjects OBJECT IDENTIFIER .1.3.111.2.802.1.1.3.1 |
ieee8021SpanningTreeTableA table that contains information related to STP about
every Bridge. SEQUENCE OF Ieee8021SpanningTreeEntry .1.3.111.2.802.1.1.3.1.1 |
ieee8021SpanningTreeEntryA list of objects containing information for each Bridge
about the Spanning Tree Protocol for that Bridge. Ieee8021SpanningTreeEntry .1.3.111.2.802.1.1.3.1.1.1 |
ieee8021SpanningTreeComponentIdThe component identifier is used to distinguish between the
multiple virtual Bridge instances within a PBB. In simple
situations where there is only a single component the default
value is 1. IEEE8021PbbComponentIdentifier (IEEE8021-TC-MIB) .1.3.111.2.802.1.1.3.1.1.1.1 |
ieee8021SpanningTreeProtocolSpecificationAn 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)'. New enumerated values may be added in
the future to the definition of this object to reflect future
versions of the IEEE Spanning Tree protocol.ro Enumeration .1.3.111.2.802.1.1.3.1.1.1.2 |
ieee8021SpanningTreePriorityThe 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 ieee8021BridgeBaseBridgeAddress.
On Bridges supporting IEEE 802.1t or IEEE 802.1w,
permissible values are 0-61440, in steps of 4096.
The value of this object MUST be retained across
reinitializations of the management system.rw Integer32 .1.3.111.2.802.1.1.3.1.1.1.3 |
ieee8021SpanningTreeTimeSinceTopologyChangeThe time (in hundredths of a second) since the
last time a topology change was detected by the
Bridge entity.
For RSTP, this reports the time since the tcWhile
timer for any port on this Bridge was nonzero.ro TimeTicks UNITS "centi-seconds" .1.3.111.2.802.1.1.3.1.1.1.4 |
ieee8021SpanningTreeTopChangesThe total number of topology changes detected by
this Bridge since the management entity was last
reset or initialized.
Discontinuities in the value of the counter can occur
at re-initialization of the management system.ro Counter64 UNITS "topology changes" .1.3.111.2.802.1.1.3.1.1.1.5 |
ieee8021SpanningTreeDesignatedRootThe Bridge identifier of the root of the spanning
tree, as determined by the Spanning Tree Protocol,
as executed by this node. This value is used as
the Root Identifier parameter in all Configuration
Bridge PDUs originated by this node.ro BridgeId (BRIDGE-MIB) .1.3.111.2.802.1.1.3.1.1.1.6 |
ieee8021SpanningTreeRootCostThe cost of the path to the root as seen from
this Bridge.ro Integer32 .1.3.111.2.802.1.1.3.1.1.1.7 |
ieee8021SpanningTreeRootPortThe port number of the port that offers the lowest
cost path from this Bridge to the root Bridge.ro IEEE8021BridgePortNumber (IEEE8021-TC-MIB) .1.3.111.2.802.1.1.3.1.1.1.8 |
ieee8021SpanningTreeMaxAgeThe 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 this Bridge is currently using.ro Timeout UNITS "centi-seconds" .1.3.111.2.802.1.1.3.1.1.1.9 |
ieee8021SpanningTreeHelloTimeThe amount of time between the transmission of
Configuration Bridge PDUs by this node 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 that this Bridge is currently using.ro Timeout UNITS "centi-seconds" .1.3.111.2.802.1.1.3.1.1.1.10 |
ieee8021SpanningTreeHoldTimeThis 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.ro Integer32 UNITS "centi-seconds" .1.3.111.2.802.1.1.3.1.1.1.11 |
ieee8021SpanningTreeForwardDelayThis 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 underway, to
age all dynamic entries in the Filtering Database.
[Note that this value is the one that this Bridge is
currently using, in contrast to
ieee8021SpanningTreeBridgeForwardDelay, which is the
value that this Bridge and all others would start using
if/when this Bridge were to become the root.]ro Timeout UNITS "centi-seconds" .1.3.111.2.802.1.1.3.1.1.1.12 |
ieee8021SpanningTreeBridgeMaxAgeThe value that all Bridges use for MaxAge when this
Bridge is acting as the root. Note that 802.1D-1998
specifies that the range for this parameter is related
to the value of ieee8021SpanningTreeBridgeHelloTime. The
granularity of this timer is specified by 802.1D-1998 to
be 1 second. An agent may return an SNMP badValue error
(or its equivalent if another protocol is used) if a set
is attempted to a value that is not a whole number of
seconds.
The value of this object MUST be retained across
reinitializations of the management system.rw Timeout .1.3.111.2.802.1.1.3.1.1.1.13 |
ieee8021SpanningTreeBridgeHelloTimeThe 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-1998 to be 1 second. An
agent may return an SNMP badValue error (or its equivalent
if another protocol is used) if a set is attempted to a
value that is not a whole number of seconds.
The value of this object MUST be retained across
reinitializations of the management system.rw Timeout .1.3.111.2.802.1.1.3.1.1.1.14 |
ieee8021SpanningTreeBridgeForwardDelayThe value that all Bridges use for ForwardDelay when
this Bridge is acting as the root. Note that
802.1D-1998 specifies that the range for this parameter
is related to the value of ieee8021SpanningTreeBridgeMaxAge.
The granularity of this timer is specified by 802.1D-1998
to be 1 second. An agent may return an SNMP badValue error
(or its equivalent if another protocol is used) if a set is
attempted to a value that is not a whole number of seconds.
The value of this object MUST be retained across
reinitializations of the management system.rw Timeout .1.3.111.2.802.1.1.3.1.1.1.15 |
ieee8021SpanningTreeVersionThe version of Spanning Tree Protocol the Bridge is
currently running. The values are directly from
the IEEE standard. New values may be defined as future
versions of the protocol become available.
The value 'stp(0)' indicates the Bridge is running the
Spanning Tree Protocol specified in IEEE 802.1D-1998.
The value 'rstp(2)' indicates the Bridge is running RSTP
specified in IEEE 802.1Q.
The value 'mstp(3)' indicates the Bridge is running
MSTP specified in Clause 13 of IEEE802.1Q
The value of this object MUST be retained across
reinitializations of the management system.rw Enumeration .1.3.111.2.802.1.1.3.1.1.1.16 |
ieee8021SpanningTreeRstpTxHoldCountThe value used by the Port Transmit state machine to limit
the maximum transmission rate. This is used by Bridges
that are running RSTP.
The value of this object MUST be retained across
reinitializations of the management system.rw Integer32 .1.3.111.2.802.1.1.3.1.1.1.17 |
ieee8021SpanningTreePortTableA table that contains port-specific information
for the Spanning Tree Protocol. SEQUENCE OF Ieee8021SpanningTreePortEntry .1.3.111.2.802.1.1.3.1.2 |
ieee8021SpanningTreePortEntryA list of objects containing information maintained by
every port about the Spanning Tree Protocol state for
that port. Ieee8021SpanningTreePortEntry .1.3.111.2.802.1.1.3.1.2.1 |
ieee8021SpanningTreePortComponentIdThe component identifier is used to distinguish between the
multiple virtual Bridge instances within a PBB. In simple
situations where there is only a single component the default
value is 1. IEEE8021PbbComponentIdentifier (IEEE8021-TC-MIB) .1.3.111.2.802.1.1.3.1.2.1.1 |
ieee8021SpanningTreePortThe port number of the port for which this entry
contains Spanning Tree Protocol management information. IEEE8021BridgePortNumber (IEEE8021-TC-MIB) .1.3.111.2.802.1.1.3.1.2.1.2 |
ieee8021SpanningTreePortPriorityThe value of the priority field that 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 ieee8021SpanningTreePort.
On Bridges supporting IEEE 802.1t or IEEE 802.1w,
permissible values are 0-240, in steps of 16.
The value of this object MUST be retained across
reinitializations of the management system.rw Integer32 .1.3.111.2.802.1.1.3.1.2.1.3 |
ieee8021SpanningTreePortStateThe 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 that are disabled (see
ieee8021SpanningTreePortEnabled), this object will have a
value of disabled(1). The values disabled, blocking,
listening, and broken correspond to the Clause 12 port
state of 'Discarding'. The value learning corresponds to
the Clause 12 port state of 'Learning'. The value forwarding
corresponds to the Clause 12 port state of 'Forwarding'.ro Enumeration .1.3.111.2.802.1.1.3.1.2.1.4 |
ieee8021SpanningTreePortEnabledThe enabled/disabled status of the port. A value of true(1)
means the spanning-tree protocol is enabled for this port.
The value of this object MUST be retained across
reinitializations of the management system.rw TruthValue (SNMPv2-TC) .1.3.111.2.802.1.1.3.1.2.1.5 |
ieee8021SpanningTreePortPathCostThe contribution of this port to the path cost of
paths towards the spanning tree root which include
this port. Table 13-4 recommends defaults and ranges
for Port Path Cost values, in inverse proportion
to the speed of the attached LAN. If this object is used
to set the Path Cost it is possible to restore the
default setting using the
ieee8021SpanningTreeRstpPortAdminPathCost object.
Table 13-4 recommends defaults and ranges for Port
Path Cost values, in inverse proportion to the speed of the
attached LAN. If this object is used to set the Path
Cost it is possible to restore the default
setting using the ieee8021MstpPortAdminPathCost object.
The value of this object MUST be retained across
reinitializations of the management system.rw Integer32 .1.3.111.2.802.1.1.3.1.2.1.6 |
ieee8021SpanningTreePortDesignatedRootThe 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.ro BridgeId (BRIDGE-MIB) .1.3.111.2.802.1.1.3.1.2.1.7 |
ieee8021SpanningTreePortDesignatedCostThe 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.ro Integer32 .1.3.111.2.802.1.1.3.1.2.1.8 |
ieee8021SpanningTreePortDesignatedBridgeThe Bridge Identifier of the Bridge that this
port considers to be the Designated Bridge for
this port's segment.ro BridgeId (BRIDGE-MIB) .1.3.111.2.802.1.1.3.1.2.1.9 |
ieee8021SpanningTreePortDesignatedPortThe Port Identifier of the port on the Designated
Bridge for this port's segment.ro OCTET STRING .1.3.111.2.802.1.1.3.1.2.1.10 |
ieee8021SpanningTreePortForwardTransitionsThe number of times this port has transitioned
from the Learning state to the Forwarding state.
Discontinuities in the value of the counter can occur
at re-initialization of the management system, and at
other times as indicated by the value of
ifCounterDiscontinuityTime object of the associated
interface (if any).ro Counter64 UNITS "forwarding transitions" .1.3.111.2.802.1.1.3.1.2.1.11 |
ieee8021SpanningTreeRstpPortProtocolMigrationWhen operating in RSTP (version 2) mode, writing true(1)
to this object forces this port to transmit RSTP BPDUs.
Any other operation on this object has no effect and
it always returns false(2) when read.rw TruthValue (SNMPv2-TC) .1.3.111.2.802.1.1.3.1.2.1.12 |
ieee8021SpanningTreeRstpPortAdminEdgePortThe administrative value of the Edge Port parameter.
A value of true(1) indicates that this port should be
assumed as an edge-port, and a value of false(2) indicates
that this port should be assumed as a non-edge-port.
Setting this object will also cause the corresponding
instance of ieee8021SpanningTreeRstpPortOperEdgePort to
change to the same value. Note that even when this
object's value is true(1), the value of the corresponding
instance of ieee8021SpanningTreeRstpPortOperEdgePort can
be false(2) if a BPDU has been received.
The value of this object MUST be retained across
reinitializations of the management system.rw TruthValue (SNMPv2-TC) .1.3.111.2.802.1.1.3.1.2.1.13 |
ieee8021SpanningTreeRstpPortOperEdgePortThe operational value of the Edge Port parameter. The
object is initialized to the value of the corresponding
instance of ieee8021SpanningTreeRstpPortAdminEdgePort.
When the corresponding instance of
ieee8021SpanningTreeRstpPortAdminEdgePort is set, this
object will be changed as well. This object will also be
changed to false(2) on reception of a BPDU.ro TruthValue (SNMPv2-TC) .1.3.111.2.802.1.1.3.1.2.1.14 |
ieee8021SpanningTreeRstpPortAdminPathCostThe administratively assigned value for the contribution
of this port to the path cost of paths toward the spanning
tree root.
Writing a value of '0' assigns the automatically calculated
default Path Cost value to the port. If the default Path
Cost is being used, this object returns '0' when read.
This complements the object ieee8021SpanningTreePortPathCost,
which returns the operational value of the path cost.
The value of this object MUST be retained across
reinitializations of the management system.rw Integer32 .1.3.111.2.802.1.1.3.1.2.1.15 |
ieee8021SpanningTreePortExtensionTableA table that contains port-specific information
for the Spanning Tree Protocol. SEQUENCE OF Ieee8021SpanningTreePortExtensionEntry .1.3.111.2.802.1.1.3.1.3 |
ieee8021SpanningTreePortExtensionEntryA list of additional objects containing information
maintained by every port about the Spanning Tree
Protocol state for that port. Ieee8021SpanningTreePortExtensionEntry .1.3.111.2.802.1.1.3.1.3.1 |
ieee8021SpanningTreeRstpPortAutoEdgePortThe administrative value of the Auto Edge Port parameter.
A value of true(1) indicates if the Bridge detection state
machine (BDM, 13.31) is to detect other Bridges
attached to the LAN, and set
ieee8021SpanningTreeRstpPortOperEdgePort automatically.
The default value is true(1)
This is optional and provided only by implementations
that support the automatic identification of edge ports.
The value of this object MUST be retained across
reinitializations of the management system.rw TruthValue (SNMPv2-TC) .1.3.111.2.802.1.1.3.1.3.1.1 |
ieee8021SpanningTreeRstpPortAutoIsolatePortThe operational value of the Isolate Port parameter.
A value of true(1) indicates a Designated Port will
transition to discarding if both
ieee8021SpanningTreeRstpPortAdminEdgePort and
ieee8021SpanningTreeRstpPortAutoEdgePort are FALSE and
the other Bridge presumed to be attached to the same
point-to-point LAN does not transmit periodic BPDUs.
This is optional and provided only by implementations
that support the automatic identification of edge ports.ro TruthValue (SNMPv2-TC) .1.3.111.2.802.1.1.3.1.3.1.2 |
ieee8021SpanningTreeRstpPortIsolatePortThe operational value of the Isolate Port parameter.
A value of true(1), Set by the Bridge detection state
machine (BDM, 13.31), indicates when the Spanning Tree
Protocol Entity of a neighboring Bridge has apparently
failed .ro TruthValue (SNMPv2-TC) .1.3.111.2.802.1.1.3.1.3.1.3 |
ieee8021SpanningTreeConformance OBJECT IDENTIFIER .1.3.111.2.802.1.1.3.2 |
ieee8021SpanningTreeCompliances OBJECT IDENTIFIER .1.3.111.2.802.1.1.3.2.1 |
ieee8021SpanningTreeGroups OBJECT IDENTIFIER .1.3.111.2.802.1.1.3.2.2 |