ENTERASYS-MSTP-MIB

Unsigned32

The unique ID of this Multiple Spanning Tree instance. This value SHALL be between 1 and etsysMstpMaxMstId inclusively.

RowStatus1 = active2 = notInService3 = notReady4 = createAndGo5 = createAndWait6 = destroyThe RowStatus textual convention is used to manage the creation and deletion of conceptual rows, and is used as the value of the SYNTAX clause for the status column of a conceptual row (as described in Section 7.7.1 of [2].) The status column has six defined values: - `active', which indicates that the conceptual row is available for use by the managed device; - `notInService', which indicates that the conceptual row exists in the agent, but is unavailable for use by the managed device (see NOTE below); 'notInService' has no implication regarding the internal consistency of the row, availability of resources, or consistency with the current state of the managed device; - `notReady', which indicates that the conceptual row exists in the agent, but is missing information necessary in order to be available for use by the managed device (i.e., one or more required columns in the conceptual row have not been instanciated); - `createAndGo', which is supplied by a management station wishing to create a new instance of a conceptual row and to have its status automatically set to active, making it available for use by the managed device; - `createAndWait', which is supplied by a management station wishing to create a new instance of a conceptual row (but not make it available for use by the managed device); and, - `destroy', which is supplied by a management station wishing to delete all of the instances associated with an existing conceptual row. Whereas five of the six values (all except `notReady') may be specified in a management protocol set operation, only three values will be returned in response to a management protocol retrieval operation: `notReady', `notInService' or `active'. That is, when queried, an existing conceptual row has only three states: it is either available for use by the managed device (the status column has value `active'); it is not available for use by the managed device, though the agent has sufficient information to attempt to make it so (the status column has value `notInService'); or, it is not available for use by the managed device, and an attempt to make it so would fail because the agent has insufficient information (the state column has value `notReady'). NOTE WELL This textual convention may be used for a MIB table, irrespective of whether the values of that table's conceptual rows are able to be modified while it is active, or whether its conceptual rows must be taken out of service in order to be modified. That is, it is the responsibility of the DESCRIPTION clause of the status column to specify whether the status column must not be `active' in order for the value of some other column of the same conceptual row to be modified. If such a specification is made, affected columns may be changed by an SNMP set PDU if the RowStatus would not be equal to `active' either immediately before or after processing the PDU. In other words, if the PDU also contained a varbind that would change the RowStatus value, the column in question may be changed if the RowStatus was not equal to `active' as the PDU was received, or if the varbind sets the status to a value other than 'active'. Also note that whenever any elements of a row exist, the RowStatus column must also exist. To summarize the effect of having a conceptual row with a status column having a SYNTAX clause value of RowStatus, consider the following state diagram: STATE +--------------+-----------+-------------+------------- | A | B | C | D | |status col.|status column| |status column | is | is |status column ACTION |does not exist| notReady | notInService| is active --------------+--------------+-----------+-------------+------------- set status |noError ->D|inconsist- |inconsistent-|inconsistent- column to | or | entValue| Value| Value createAndGo |inconsistent- | | | | Value| | | --------------+--------------+-----------+-------------+------------- set status |noError see 1|inconsist- |inconsistent-|inconsistent- column to | or | entValue| Value| Value createAndWait |wrongValue | | | --------------+--------------+-----------+-------------+------------- set status |inconsistent- |inconsist- |noError |noError column to | Value| entValue| | active | | | | | | or | | | | | | | |see 2 ->D|see 8 ->D| ->D --------------+--------------+-----------+-------------+------------- set status |inconsistent- |inconsist- |noError |noError ->C column to | Value| entValue| | notInService | | | | | | or | | or | | | | | |see 3 ->C| ->C|see 6 --------------+--------------+-----------+-------------+------------- set status |noError |noError |noError |noError ->A column to | | | | or destroy | ->A| ->A| ->A|see 7 --------------+--------------+-----------+-------------+------------- set any other |see 4 |noError |noError |see 5 column to some| | | | value | | see 1| ->C| ->D --------------+--------------+-----------+-------------+------------- (1) goto B or C, depending on information available to the agent. (2) if other variable bindings included in the same PDU, provide values for all columns which are missing but required, and all columns have acceptable values, then return noError and goto D. (3) if other variable bindings included in the same PDU, provide legal values for all columns which are missing but required, then return noError and goto C. (4) at the discretion of the agent, the return value may be either: inconsistentName: because the agent does not choose to create such an instance when the corresponding RowStatus instance does not exist, or inconsistentValue: if the supplied value is inconsistent with the state of some other MIB object's value, or noError: because the agent chooses to create the instance. If noError is returned, then the instance of the status column must also be created, and the new state is B or C, depending on the information available to the agent. If inconsistentName or inconsistentValue is returned, the row remains in state A. (5) depending on the MIB definition for the column/table, either noError or inconsistentValue may be returned. (6) the return value can indicate one of the following errors: wrongValue: because the agent does not support notInService (e.g., an agent which does not support createAndWait), or inconsistentValue: because the agent is unable to take the row out of service at this time, perhaps because it is in use and cannot be de-activated. (7) the return value can indicate the following error: inconsistentValue: because the agent is unable to remove the row at this time, perhaps because it is in use and cannot be de-activated. (8) the transition to D can fail, e.g., if the values of the conceptual row are inconsistent, then the error code would be inconsistentValue. NOTE: Other processing of (this and other varbinds of) the set request may result in a response other than noError being returned, e.g., wrongValue, noCreation, etc. Conceptual Row Creation There are four potential interactions when creating a conceptual row: selecting an instance-identifier which is not in use; creating the conceptual row; initializing any objects for which the agent does not supply a default; and, making the conceptual row available for use by the managed device. Interaction 1: Selecting an Instance-Identifier The algorithm used to select an instance-identifier varies for each conceptual row. In some cases, the instance- identifier is semantically significant, e.g., the destination address of a route, and a management station selects the instance-identifier according to the semantics. In other cases, the instance-identifier is used solely to distinguish conceptual rows, and a management station without specific knowledge of the conceptual row might examine the instances present in order to determine an unused instance-identifier. (This approach may be used, but it is often highly sub-optimal; however, it is also a questionable practice for a naive management station to attempt conceptual row creation.) Alternately, the MIB module which defines the conceptual row might provide one or more objects which provide assistance in determining an unused instance-identifier. For example, if the conceptual row is indexed by an integer-value, then an object having an integer-valued SYNTAX clause might be defined for such a purpose, allowing a management station to issue a management protocol retrieval operation. In order to avoid unnecessary collisions between competing management stations, `adjacent' retrievals of this object should be different. Finally, the management station could select a pseudo-random number to use as the index. In the event that this index was already in use and an inconsistentValue was returned in response to the management protocol set operation, the management station should simply select a new pseudo-random number and retry the operation. A MIB designer should choose between the two latter algorithms based on the size of the table (and therefore the efficiency of each algorithm). For tables in which a large number of entries are expected, it is recommended that a MIB object be defined that returns an acceptable index for creation. For tables with small numbers of entries, it is recommended that the latter pseudo-random index mechanism be used. Interaction 2: Creating the Conceptual Row Once an unused instance-identifier has been selected, the management station determines if it wishes to create and activate the conceptual row in one transaction or in a negotiated set of interactions. Interaction 2a: Creating and Activating the Conceptual Row The management station must first determine the column requirements, i.e., it must determine those columns for which it must or must not provide values. Depending on the complexity of the table and the management station's knowledge of the agent's capabilities, this determination can be made locally by the management station. Alternately, the management station issues a management protocol get operation to examine all columns in the conceptual row that it wishes to create. In response, for each column, there are three possible outcomes: - a value is returned, indicating that some other management station has already created this conceptual row. We return to interaction 1. - the exception `noSuchInstance' is returned, indicating that the agent implements the object-type associated with this column, and that this column in at least one conceptual row would be accessible in the MIB view used by the retrieval were it to exist. For those columns to which the agent provides read-create access, the `noSuchInstance' exception tells the management station that it should supply a value for this column when the conceptual row is to be created. - the exception `noSuchObject' is returned, indicating that the agent does not implement the object-type associated with this column or that there is no conceptual row for which this column would be accessible in the MIB view used by the retrieval. As such, the management station can not issue any management protocol set operations to create an instance of this column. Once the column requirements have been determined, a management protocol set operation is accordingly issued. This operation also sets the new instance of the status column to `createAndGo'. When the agent processes the set operation, it verifies that it has sufficient information to make the conceptual row available for use by the managed device. The information available to the agent is provided by two sources: the management protocol set operation which creates the conceptual row, and, implementation-specific defaults supplied by the agent (note that an agent must provide implementation-specific defaults for at least those objects which it implements as read-only). If there is sufficient information available, then the conceptual row is created, a `noError' response is returned, the status column is set to `active', and no further interactions are necessary (i.e., interactions 3 and 4 are skipped). If there is insufficient information, then the conceptual row is not created, and the set operation fails with an error of `inconsistentValue'. On this error, the management station can issue a management protocol retrieval operation to determine if this was because it failed to specify a value for a required column, or, because the selected instance of the status column already existed. In the latter case, we return to interaction 1. In the former case, the management station can re-issue the set operation with the additional information, or begin interaction 2 again using `createAndWait' in order to negotiate creation of the conceptual row. NOTE WELL Regardless of the method used to determine the column requirements, it is possible that the management station might deem a column necessary when, in fact, the agent will not allow that particular columnar instance to be created or written. In this case, the management protocol set operation will fail with an error such as `noCreation' or `notWritable'. In this case, the management station decides whether it needs to be able to set a value for that particular columnar instance. If not, the management station re-issues the management protocol set operation, but without setting a value for that particular columnar instance; otherwise, the management station aborts the row creation algorithm. Interaction 2b: Negotiating the Creation of the Conceptual Row The management station issues a management protocol set operation which sets the desired instance of the status column to `createAndWait'. If the agent is unwilling to process a request of this sort, the set operation fails with an error of `wrongValue'. (As a consequence, such an agent must be prepared to accept a single management protocol set operation, i.e., interaction 2a above, containing all of the columns indicated by its column requirements.) Otherwise, the conceptual row is created, a `noError' response is returned, and the status column is immediately set to either `notInService' or `notReady', depending on whether it has sufficient information to (attempt to) make the conceptual row available for use by the managed device. If there is sufficient information available, then the status column is set to `notInService'; otherwise, if there is insufficient information, then the status column is set to `notReady'. Regardless, we proceed to interaction 3. Interaction 3: Initializing non-defaulted Objects The management station must now determine the column requirements. It issues a management protocol get operation to examine all columns in the created conceptual row. In the response, for each column, there are three possible outcomes: - a value is returned, indicating that the agent implements the object-type associated with this column and had sufficient information to provide a value. For those columns to which the agent provides read-create access (and for which the agent allows their values to be changed after their creation), a value return tells the management station that it may issue additional management protocol set operations, if it desires, in order to change the value associated with this column. - the exception `noSuchInstance' is returned, indicating that the agent implements the object-type associated with this column, and that this column in at least one conceptual row would be accessible in the MIB view used by the retrieval were it to exist. However, the agent does not have sufficient information to provide a value, and until a value is provided, the conceptual row may not be made available for use by the managed device. For those columns to which the agent provides read-create access, the `noSuchInstance' exception tells the management station that it must issue additional management protocol set operations, in order to provide a value associated with this column. - the exception `noSuchObject' is returned, indicating that the agent does not implement the object-type associated with this column or that there is no conceptual row for which this column would be accessible in the MIB view used by the retrieval. As such, the management station can not issue any management protocol set operations to create an instance of this column. If the value associated with the status column is `notReady', then the management station must first deal with all `noSuchInstance' columns, if any. Having done so, the value of the status column becomes `notInService', and we proceed to interaction 4. Interaction 4: Making the Conceptual Row Available Once the management station is satisfied with the values associated with the columns of the conceptual row, it issues a management protocol set operation to set the status column to `active'. If the agent has sufficient information to make the conceptual row available for use by the managed device, the management protocol set operation succeeds (a `noError' response is returned). Otherwise, the management protocol set operation fails with an error of `inconsistentValue'. NOTE WELL A conceptual row having a status column with value `notInService' or `notReady' is unavailable to the managed device. As such, it is possible for the managed device to create its own instances during the time between the management protocol set operation which sets the status column to `createAndWait' and the management protocol set operation which sets the status column to `active'. In this case, when the management protocol set operation is issued to set the status column to `active', the values held in the agent supersede those used by the managed device. If the management station is prevented from setting the status column to `active' (e.g., due to management station or network failure) the conceptual row will be left in the `notInService' or `notReady' state, consuming resources indefinitely. The agent must detect conceptual rows that have been in either state for an abnormally long period of time and remove them. It is the responsibility of the DESCRIPTION clause of the status column to indicate what an abnormally long period of time would be. This period of time should be long enough to allow for human response time (including `think time') between the creation of the conceptual row and the setting of the status to `active'. In the absence of such information in the DESCRIPTION clause, it is suggested that this period be approximately 5 minutes in length. This removal action applies not only to newly-created rows, but also to previously active rows which are set to, and left in, the notInService state for a prolonged period exceeding that which is considered normal for such a conceptual row. Conceptual Row Suspension When a conceptual row is `active', the management station may issue a management protocol set operation which sets the instance of the status column to `notInService'. If the agent is unwilling to do so, the set operation fails with an error of `wrongValue' or `inconsistentValue'. Otherwise, the conceptual row is taken out of service, and a `noError' response is returned. It is the responsibility of the DESCRIPTION clause of the status column to indicate under what circumstances the status column should be taken out of service (e.g., in order for the value of some other column of the same conceptual row to be modified). Conceptual Row Deletion For deletion of conceptual rows, a management protocol set operation is issued which sets the instance of the status column to `destroy'. This request may be made regardless of the current value of the status column (e.g., it is possible to delete conceptual rows which are either `notReady', `notInService' or `active'.) If the operation succeeds, then all instances associated with the conceptual row are immediately removed. · Integer32

Reference: RFC2579 (Textual Conventions for SMIv2)

This object allows for the dynamic creation and deletion of the corresponding Spanning Tree instance. Creation and activation of a conceptual row in this table MUST be performed as a single operation -- by setting this object to createAndGo(4) -- and suspension of an active conceptual row is not supported. Consequently, setting this object to createAndWait(5) or notInService(2) SHALL fail. Setting this object to destroy(6) SHALL fail if the corresponding Spanning Tree instance has one or more FIDs allocated to it in the FID to MSTID Allocation Table (etsysMstpAllocTable). Refer to the RowStatus convention for further details on the behavior of this object.

Unsigned32

The unique ID of the Filtering Database to which the information in this table entry applies. This value SHALL be between 1 and dot1qMaxVlanId inclusively.

Unsigned32

The ID of the Spanning Tree instance to which the corresponding FID is mapped. This ID must either be 0 (i.e., the CIST) or be a value which is present in the MSTI Table (etsysMstpMstiTable).

Unsigned32

The unique ID of the VLAN to which the information in this table entry applies. This value SHALL be between 1 and dot1qMaxVlanId inclusively.

Unsigned32

The ID of the Spanning Tree instance to which the corresponding VLAN is mapped.

Unsigned32 (0..61440)

Reference: IEEE 802.1s clause 12.8.1

The value of the priority component of the Bridge ID for the corresponding Spanning Tree instance. Specifically, the four most significant bits of the most significant octet of the (8 octet long) Bridge ID followed by 12 zero bits. Note that this object may only be set to a 16-bit value in which the least significant 12 bits are zero, i.e., permissible values are 0-61440, in steps of 4096.

TimeTicks

Reference: IEEE 802.1s clause 12.8.1

The elapsed time, in units of hundredths of a second, since the last time a topology change was detected by the corresponding Spanning Tree instance (specifically, the elapsed time since the tcWhile timer for any port was non-zero).

Counter32

Reference: IEEE 802.1s clause 12.8.1

The total number of topology changes detected by the corresponding Spanning Tree instance since the management entity was last reset or initialized (specifically, the count of times that the tcWhile timer for any port has been non-zero).

TruthValue1 = true2 = falseRepresents a boolean value. · Integer32

Reference: IEEE 802.1s clause 12.8.1

True(1) if the tcWhile timer is non-zero for any port for the corresponding Spanning Tree instance, false(2) otherwise.

BridgeIdThe Bridge-Identifier, as used in the Spanning Tree Protocol, to uniquely identify a bridge. Its first two octets (in network byte order) contain a priority value, and its last 6 octets contain the MAC address used to refer to a bridge in a unique fashion (typically, the numerically smallest MAC address of all ports on the bridge). SIZE (8) · OCTET STRING

Reference: IEEE 802.1s clause 12.8.1

The bridge identifier of the root for the corresponding Spanning Tree instance.

Unsigned32

Reference: IEEE 802.1s clause 12.8.1

The cost of the path to the root of the corresponding Spanning Tree instance as seen from this bridge.

Unsigned32

Reference: IEEE 802.1s clause 12.8.1

The port number of the port which offers the lowest cost path from this bridge to the root bridge for the corresponding Spanning Tree instance.

InterfaceIndexA unique value, greater than zero, for each interface or interface sub-layer in the managed system. It is recommended that values are assigned contiguously starting from 1. The value for each interface sub-layer must remain constant at least from one re-initialization of the entity's network management system to the next re-initialization. (1..2147483647) · Integer32 · hint d

The port number of the port for which this entry contains Multiple Spanning Tree Protocol management information.

Unsigned32 (0..240)

Reference: IEEE 802.1s clause 12.8.2

The value of the priority field which is contained in the first (in network byte order) octet of the (2 octet long) Port ID for the corresponding Spanning Tree instance. Permissible values are 0-240, in steps of 16.

INTEGER1 = disabled2 = blocking3 = listening4 = learning5 = forwarding6 = broken · Integer32

The port's current state in the corresponding Spanning Tree instance as defined by application of the Multiple 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 administratively disabled (see dot1dStpPortEnable), this object will have a value of disabled(1).

Unsigned32 (0..200000000)

Reference: IEEE 802.1s clause 12.8.2, IEEE 802.1t-2001 Table 8-5

The administratively assigned value for the contribution of this port to the path cost of paths towards the root of the corresponding Spanning Tree instance. Writing a value of '0' assigns the automatically calculated default Path Cost value to the port for this instance. If the default Path Cost is being used, this object returns '0' when read. This complements the object etsysMstpPortOperPathCost, which returns the operational value of the path cost.

Unsigned32

Reference: IEEE 802.1s clause 12.8.2, IEEE 802.1t-2001 Table 8-5

The operational value for the contribution of this port to the path cost of paths towards the root of the corresponding Spanning Tree instance.

BridgeIdThe Bridge-Identifier, as used in the Spanning Tree Protocol, to uniquely identify a bridge. Its first two octets (in network byte order) contain a priority value, and its last 6 octets contain the MAC address used to refer to a bridge in a unique fashion (typically, the numerically smallest MAC address of all ports on the bridge). SIZE (8) · OCTET STRING

Reference: IEEE 802.1s clause 12.8.2

The unique Bridge Identifier of the Bridge recorded as the Root of the corresponding Spanning Tree in the Configuration BPDUs transmitted by the Designated Bridge for the segment to which the port is attached.

Unsigned32

Reference: IEEE 802.1s clause 12.8.2

The path cost of the Designated Port of the segment connected to this port, for the corresponding Spanning Tree instance. This value is compared to the Root Path Cost field in received bridge PDUs.

BridgeIdThe Bridge-Identifier, as used in the Spanning Tree Protocol, to uniquely identify a bridge. Its first two octets (in network byte order) contain a priority value, and its last 6 octets contain the MAC address used to refer to a bridge in a unique fashion (typically, the numerically smallest MAC address of all ports on the bridge). SIZE (8) · OCTET STRING

Reference: IEEE 802.1s clause 12.8.2

The Bridge Identifier of the bridge which this port considers to be the Designated Bridge for this port's segment on the corresponding Spanning Tree instance.

OCTET STRING

Reference: IEEE 802.1s clause 12.8.2

The Port Identifier of the port on the Designated Bridge for this port's segment on the corresponding Spanning Tree instance.

INTEGER1 = disabled2 = root3 = designated4 = alternate5 = backUp6 = master · Integer32

Indicates this port's role on the corresponding Spanning Tree instance. disabled -- this port has no role on this MST instance. root -- this port has the role of root port on this MST instance. designated -- this port has the role of designated port on this MST instance. alternate -- this port has the role of alternate port on this MST instance. backUp -- this port has the role of backup port on this MST instance. master -- this port has the role of master port on this MST instance.

Unsigned32

Reference: IEEE 802.1s clause 12.8.2

The amount of time, in hundredths of a second, between the transmission of Configuration bridge PDUs on this port when it has the role of designated port for any Spanning Tree instance. This is the actual value that this bridge is currently using.

Unsigned32 (100..1000)

Reference: IEEE 802.1s clause 12.8.2

The value, in hundredths of a second, that all bridges attached to this port's LAN segment use for HelloTime when this bridge is acting as the CIST root.

TruthValue1 = true2 = falseRepresents a boolean value. · Integer32

True(1) if this port is attached to a LAN which is in a different MST Region than this bridge, false(2) otherwise.

EnabledStatus1 = enabled2 = disabledA simple status value for the object. · Integer32

The enabled/disabled status of the Backup Root functionality on this MSTI.

INTEGER1 = none2 = disputed3 = spanGuardLocked4 = loopProtectEvent5 = loopProtectAdvisory6 = loopbackDetected · Integer32

Indicates the reason why this port has been placed in a non-forwarding state on this MSTI (other than as a result of normal Spanning Tree protocol operation). none(1) - the port has not been placed in a non-forwarding state due to any exceptional condition. disputed(2) - the port has been placed in listening state because it has a designated role and an inferior designated BPDU has been received. spanGuardLocked(3) - the port has been placed in blocking state because it is configured as an admin edge port and a BPDU has been received. loopProtectEvent(4) - the port has been placed in listening or blocking state because a BPDU timeout has occurred and the port is awaiting reception of a type 2 BPDU on a point-to-point link. loopProtectAdvisory(5) - the port has been placed in listening state because a BPDU timeout has occurred (as with a Loop Protect event), but this condition may be normal because the link partner does not support the Loop Protect feature. loopbackDetected(6) - the port has been placed in blocking state because a loopback condition has been detected.

EnabledStatus1 = enabled2 = disabledA simple status value for the object. · Integer32

The enabled/disabled status of the Loop Protect functionality for this port on this MSTI.

TruthValue1 = true2 = falseRepresents a boolean value. · Integer32

The state of this port on this MSTI with respect to the Loop Protect feature. true(1) - this port is being held in the blocking state by the Loop Protect feature. false(2) - this port is not being held in the blocking state by the Loop Protect feature. When this object has a value of true(1) setting its value to false(2) will cause the Loop Protect feature to no longer hold the port in the blocking state. All other set operations on this object are undefined and MUST NOT have any effect.