DEC-BUS-MIB

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Category: Vendor: DEC/Digital

Description: Manages backplane bus configuration and status for Digital Equipment Corporation network equipment.

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What Is DEC-BUS-MIB?

DEC-BUS-MIB is a Digital Equipment Corporation MIB for managing Broadcast and Unknown Server (BUS) components used in legacy DEC ATM LAN Emulation-style network equipment, tracking the configuration and status of bus components over ATM or LAN backplane connections. It exposes a configuration table (decBusConfigTable) with per-bus admin/operational status, last-change timestamp, ATM address, description, LAN name/type, and maximum data frame size, alongside row-status control for creating/deleting bus entries. It is used to monitor the operational status of these BUS components, checking decBusOperStatus against decBusAdminStatus to detect a bus service that has gone down unexpectedly, and watching decBusLastChange to identify recent state transitions that might explain a LAN emulation service disruption. It depends on standard ATM addressing conventions (decBusAtmAddress) and is typically used alongside DEC's other LAN Emulation/ATM MIBs for a complete view of the emulated LAN service. It was deployed on Digital Equipment Corporation networking equipment supporting ATM LAN Emulation (LANE) in 1990s enterprise backbone deployments, and administrators maintaining this legacy gear can still download the DEC-BUS-MIB file to load it into a modern MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in DEC-BUS-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Digital Equipment Corporation ATM LAN Emulation (LANE) network device

Monitoring Examples

An operator polling decBusConfigTable indexed by decBusIndex can compare decBusAdminStatus to decBusOperStatus to catch a Broadcast and Unknown Server component that is administratively enabled but operationally down, indicating an ATM LANE service fault. Checking decBusLastChange after an alert helps correlate the fault with a specific recent event, such as a configuration change or ATM signaling failure. The decBusAtmAddress and decBusLanType fields let an administrator verify the bus component is bound to the correct ATM address and emulated LAN type (Ethernet or Token Ring) for its network segment.

What Can Be Monitored

BUS component administrative status
BUS component operational status
last configuration change time
ATM address binding
emulated LAN type and max frame size

Imported Objects

From DECATM-MIB

decMIBextension

OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
TimeTicks

OIDs

OID symbolic	OID numeric	Type	Access	Description
INT decBusActiveClients	1.3.6.1.4.1.36.2.18.29.1.2.1.1	INTEGER	read-only	The number of active clients of this BUS component. This count only includes those clients which have both Multicast Send and Multicast Forward VCCs.
INT decBusAdminStatus	1.3.6.1.4.1.36.2.18.29.1.1.1.3	INTEGER	read-write	The desired state of this BUS component. When a BUS is distributed, this object controls the 'local' server component, as opposed to the overall state of the BUS. If a LES is connected to the BUS, enabling/disabling either server may affect both of them. Otherwise it is up to the network manager to coordinate the state of the servers.
OCT decBusAtmAddress	1.3.6.1.4.1.36.2.18.29.1.1.1.6	OCTET STRING	read-only	The ATM address of this Broadcast and Unknown Server, or Broadcast and Unknown Server component. Clients establish Multicast Send VCCs to this address as part of the BUS Connect phase of LAN Emulation.
decBusCallStatsEntry	1.3.6.1.4.1.36.2.18.29.1.8.1		not-accessible	Each row contains connection statistics for one Broadcast and Unknown Server.
decBusCallStatsGroup	1.3.6.1.4.1.36.2.18.29.2.1.7
decBusCallStatsTable	1.3.6.1.4.1.36.2.18.29.1.8		not-accessible	This table holds statistics on virtual circuit/leaf establishment attempts. It contains one row for each Broadcast and Unknown Server, and acts as an extension to the 'decBusConfigTable'.
decBusCircuitGroup	1.3.6.1.4.1.36.2.18.29.2.1.6
OCT decBusClientAtmAddress	1.3.6.1.4.1.36.2.18.29.1.4.1.2	OCTET STRING	read-only	The primary ATM address of the LAN Emulation Client.
decBusClientEntry	1.3.6.1.4.1.36.2.18.29.1.4.1		not-accessible	Each entry describes an active LAN Emulation Client, from the perspective of the BUS.
decBusClientGroup	1.3.6.1.4.1.36.2.18.29.2.1.4
INT decBusClientID	1.3.6.1.4.1.36.2.18.29.1.4.1.3	INTEGER	read-only	Contains the first LECID the appropriate BUS has seen for this client, or zero if none has been seen yet.
INT decBusClientIndex	1.3.6.1.4.1.36.2.18.29.1.4.1.1	INTEGER	read-only	A unique value for each table row. This value has no predefined relation to a client's LECID.
INT decBusClientRowStatus	1.3.6.1.4.1.36.2.18.29.1.4.1.6	INTEGER	read-write	Provides a way to disconnect a LEC from the BUS. When read, this object has the value 'active'. When written, it only accepts the value 'destroy'. Because the ability to disconnect clients could lead to denial-of-service attacks, support for this feature is strictly optional.
INT decBusClientState	1.3.6.1.4.1.36.2.18.29.1.4.1.5	INTEGER	read-only	Indicates the status of this LEC from the server's perspective.
decBusClientStatesEntry	1.3.6.1.4.1.36.2.18.29.1.2.1		not-accessible	Each row contains counters for one BUS component.
decBusClientStatesGroup	1.3.6.1.4.1.36.2.18.29.2.1.2
decBusClientStatesTable	1.3.6.1.4.1.36.2.18.29.1.2		not-accessible	A table describing how many clients are in various membership states.
decBusClientTable	1.3.6.1.4.1.36.2.18.29.1.4		not-accessible	A table listing clients of the emulated LANs which this node serves. This table reflects the actual membership of each emulated LAN, as opposed to the desired membership.
INT decBusClientUsedSeveralIDs	1.3.6.1.4.1.36.2.18.29.1.4.1.4	INTEGER	read-only	Indicates whether the appropriate BUS has seen two or more non-zero LEC IDs for this client. This is not a normal condition, and it would usually arise due to a transmission error in a frame or due to a client that was violating the LAN Emulation specification.
decBusConfigEntry	1.3.6.1.4.1.36.2.18.29.1.1.1		not-accessible	Each row of the table describes a standalone BUS or a component of a BUS.
decBusConfigGroup	1.3.6.1.4.1.36.2.18.29.2.1.1
decBusConfigTable	1.3.6.1.4.1.36.2.18.29.1.1		not-accessible	A table which describes all the Broadcast and Unknown Server components implemented by this managed device.
OCT decBusDescription	1.3.6.1.4.1.36.2.18.29.1.1.1.7	OCTET STRING	read-write	A human-readable string which can contain anything the network manager wants.
OCT decBusEventClientAtmAddress	1.3.6.1.4.1.36.2.18.29.1.10.1.6	OCTET STRING	read-only	If known, the ATM address of the LAN Emulation Client that was involved in this incident.
INT decBusEventIndex	1.3.6.1.4.1.36.2.18.29.1.10.1.1	INTEGER	read-only	A unique number greater than zero which identifies this table row.
decBusEventLogEntry	1.3.6.1.4.1.36.2.18.29.1.10.1		not-accessible	An entry describing a significant event.
decBusEventLogGroup	1.3.6.1.4.1.36.2.18.29.2.1.8
INT decBusEventLogMaximumSize	1.3.6.1.4.1.36.2.18.29.1.9	INTEGER	read-write	The minimum number of events which the agent should remember before purging old log entries to make way for new ones.
decBusEventLogTable	1.3.6.1.4.1.36.2.18.29.1.10		not-accessible	A table of event log entries for the emulated LANs that this node serves.
INT decBusEventReason	1.3.6.1.4.1.36.2.18.29.1.10.1.3	INTEGER	read-only	The cause of the failure.
INT decBusEventServer	1.3.6.1.4.1.36.2.18.29.1.10.1.4	INTEGER	read-only	The 'decBusIndex' of the LAN Emulation Server that was involved in this incident. If the value of this object is zero, it indicates that the server no longer exists.
OCT decBusEventServerAtmAddress	1.3.6.1.4.1.36.2.18.29.1.10.1.5	OCTET STRING	read-only	The ATM address of the Broadcast and Unknown Server that was involved in this incident.
TIK decBusEventTimestamp	1.3.6.1.4.1.36.2.18.29.1.10.1.7	TimeTicks	read-only	The value of sysUpTime at the time that the event occurred. If the event occurred prior to the last re-initialization of the local network management subsystem, this object contains a zero value.
INT decBusEventType	1.3.6.1.4.1.36.2.18.29.1.10.1.2	INTEGER	read-only	The event which triggered this log entry. joinFailed(1) - A client tried to join one of the broadcast domains which this host serves, but the attempt failed.
CTR decBusFramesAgedOut	1.3.6.1.4.1.36.2.18.29.1.3.1.3	Counter	read-only	The number of frames which were discarded because delay exceeded the Maximum Frame Age.
CTR decBusFramesDiscarded	1.3.6.1.4.1.36.2.18.29.1.3.1.5	Counter	read-only	The number of frames which could not be forwarded, even though no errors had been detected, and the frames had not aged out.
CTR decBusFramesForwarded	1.3.6.1.4.1.36.2.18.29.1.3.1.1	Counter	read-only	The number of frames successfully forwarded by this Broadcast and Unknown Server.
CTR decBusFramesRateLimited	1.3.6.1.4.1.36.2.18.29.1.3.1.4	Counter	read-only	The number of frames which were discarded in order to enforce 'decBusMaxForwardingRate'.
INT decBusIndex	1.3.6.1.4.1.36.2.18.29.1.1.1.1	INTEGER	read-only	A unique number greater than zero which identifies this table row.
CTR decBusInvalidFrames	1.3.6.1.4.1.36.2.18.29.1.3.1.2	Counter	read-only	The number of frames which were discarded because of errors (such as invalid frame length).
OCT decBusLanName	1.3.6.1.4.1.36.2.18.29.1.1.1.8	OCTET STRING	read-write	The name of this emulated LAN. While not required for operational purposes, providing a LAN Name may make it easier to keep track of which BUS component is which. This string is not guaranteed to uniquely identify the emulated LAN.
INT decBusLanType	1.3.6.1.4.1.36.2.18.29.1.1.1.9	INTEGER	read-write	The data frame format (or LAN-TYPE) for the emulated LAN this Broadcast and Unknown Server supports. In an active emulated LAN, this parameter MUST have a consistent value in all of the LES and BUS components serving the emulated LAN. Otherwise, problems may result. This columnar object's value may only be changed when 'decBus[Admin,Oper]Status' are 'down'.
TIK decBusLastChange	1.3.6.1.4.1.36.2.18.29.1.1.1.5	TimeTicks	read-only	The value of sysUpTime at the time that this server last entered its current operational state. If the current state was entered prior to the last re-initialization of the local network management subsystem, then this object contains a zero value.
OCT decBusLecAtmAddress	1.3.6.1.4.1.36.2.18.29.1.5.1.1	OCTET STRING	read-only	The primary ATM address of the LAN Emulation Client.
decBusLecEntry	1.3.6.1.4.1.36.2.18.29.1.5.1		not-accessible	Each entry describes a LAN Emulation Client from the perspective of the BUS.
decBusLecGroup	1.3.6.1.4.1.36.2.18.29.2.1.5
INT decBusLecID	1.3.6.1.4.1.36.2.18.29.1.5.1.3	INTEGER	read-only	Contains the first LECID the appropriate BUS has seen for this client, or zero if none has been seen yet.
INT decBusLecIndex	1.3.6.1.4.1.36.2.18.29.1.5.1.2	INTEGER	read-only	The client's index in the 'decBusClientTable'. Note that this value is NOT the client's LEC-ID.
INT decBusLecRowStatus	1.3.6.1.4.1.36.2.18.29.1.5.1.6	INTEGER	read-write	Provides a way to disconnect a LEC from the BUS. When read, this object has the value 'active'. When written, it only accepts the value 'destroy'. Because the ability to disconnect clients could lead to denial-of-service attacks, support for this feature is strictly optional.
INT decBusLecState	1.3.6.1.4.1.36.2.18.29.1.5.1.5	INTEGER	read-only	Indicates the status of this LEC from the server's perspective.
decBusLecTable	1.3.6.1.4.1.36.2.18.29.1.5		not-accessible	A table listing clients which belong to the emulated LANs that this node serves.
INT decBusLecUsedSeveralIDs	1.3.6.1.4.1.36.2.18.29.1.5.1.4	INTEGER	read-only	Indicates whether the appropriate BUS has seen two or more non-zero LEC IDs for this client. This is not a normal condition, and it would usually arise due to a transmission error in a frame or due to a client that was violating the LAN Emulation specification.
INT decBusMaxDataFrameSize	1.3.6.1.4.1.36.2.18.29.1.1.1.10	INTEGER	read-write	The maximum AAL-5 SDU size for data frames sent over this emulated LAN. This must be one of the standard sizes defined in the LAN Emulation specification, in other words either 1516, 4544, 9234, or 18190 octets. In an active emulated LAN, this parameter MUST have a consistent value in all of the LES and BUS components serving the emulated LAN. Otherwise, problems may result. This columnar object's value may only be changed when 'decBus[Admin,Oper]Status' are 'down'.
INT decBusMaxForwardingRate	1.3.6.1.4.1.36.2.18.29.1.1.1.12	INTEGER	read-write	The maximum rate at which this Broadcast and Unknown Server will forward frames.
INT decBusMaxFrameAge	1.3.6.1.4.1.36.2.18.29.1.1.1.11	INTEGER	read-write	The maximum amount of time which this Broadcast and Unknown Server can hold a frame before being forced to either forward or discard it. If a BUS is distributed, each of its servers should have the same value for this parameter.
CTR decBusMfClientRejects	1.3.6.1.4.1.36.2.18.29.1.8.1.10	Counter	read-only	The number of Multicast Forward connections which this BUS component's clients refused to accept.
CTR decBusMfOutOfResourcesFailures	1.3.6.1.4.1.36.2.18.29.1.8.1.9	Counter	read-only	The number of Multicast Forward connections which this BUS component could not establish due to lack of resources.
decBusMIB	1.3.6.1.4.1.36.2.18.29
decBusMIBCompliance	1.3.6.1.4.1.36.2.18.29.2.2.1
decBusMIBCompliances	1.3.6.1.4.1.36.2.18.29.2.2
decBusMIBConformance	1.3.6.1.4.1.36.2.18.29.2
decBusMIBGroups	1.3.6.1.4.1.36.2.18.29.2.1
decBusMIBObjects	1.3.6.1.4.1.36.2.18.29.1
CTR decBusMsInvalidInfoElements	1.3.6.1.4.1.36.2.18.29.1.8.1.4	Counter	read-only	The number of Multicast Send establishment attempts for this BUS component which failed because required information elements were missing or contained invalid information. The optional Event Log group can help you determine which information elements were invalid or missing. This object does not count call failures included in decBusMsWrongLanTypes or decBusMsWrongMaxFrameSizes.
CTR decBusMsOutOfResourcesFailures	1.3.6.1.4.1.36.2.18.29.1.8.1.3	Counter	read-only	The number of Multicast Send establishment attempts for this BUS component which failed for lack of resources.
CTR decBusMsWrongLanTypes	1.3.6.1.4.1.36.2.18.29.1.8.1.5	Counter	read-only	The number of Multicast Send establishment attempts which were rejected because they specified a different LAN Type (data frame format) than the one configured for this BUS component.
CTR decBusMsWrongMaxFrameSizes	1.3.6.1.4.1.36.2.18.29.1.8.1.6	Counter	read-only	The number of Multicast Send establishment attempts which were rejected because they specified a different maximum AAL-5 SDU size than the one configured for this BUS component.
CTR decBusMulticastForwardCalls	1.3.6.1.4.1.36.2.18.29.1.8.1.7	Counter	read-only	The number of Multicast Forward connections which this BUS tried to establish.
CTR decBusMulticastForwardFailures	1.3.6.1.4.1.36.2.18.29.1.8.1.8	Counter	read-only	The number of Multicast Forward connections which this BUS was unable to establish. This includes failures counted in decBusMfOutOfResourcesFailures decBusMfClientRejects and any miscellaneous failures.
decBusMulticastFwdEntry	1.3.6.1.4.1.36.2.18.29.1.7.1		not-accessible	Each entry describes the circuits going to one LAN Emulation Client.
INT decBusMulticastFwdInProgress	1.3.6.1.4.1.36.2.18.29.1.2.1.2	INTEGER	read-only	The number of clients to which this BUS component is currently establishing Multicast Forward VCCs.
INT decBusMulticastFwdInterface	1.3.6.1.4.1.36.2.18.29.1.7.1.1	INTEGER	read-only	The 'ifIndex' of the ATM port which terminates the Multicast Forward VCC at the BUS.
INT decBusMulticastFwdRowStatus	1.3.6.1.4.1.36.2.18.29.1.7.1.4	INTEGER	read-write	An object provided to satisfy the requirement that all tables have at least one accessible object; in the future, it may also be extended to provide PVC support.
decBusMulticastFwdTable	1.3.6.1.4.1.36.2.18.29.1.7		not-accessible	This optional table identifies Multicast Forward VCCs at the place where they attach to the BUS. In a SVC implementation, this table will be read- only. In a PVC implementation, this table can be used to tell the BUS about the creation or the deletion of Multicast Forward VCCs.
INT decBusMulticastFwdVci	1.3.6.1.4.1.36.2.18.29.1.7.1.3	INTEGER	read-only	The VCI of the Multicast Forward VCC at the point where this VCC connects to the BUS.
INT decBusMulticastFwdVpi	1.3.6.1.4.1.36.2.18.29.1.7.1.2	INTEGER	read-only	The VPI of the Multicast Forward VCC at the point where this VCC connects to the BUS.
CTR decBusMulticastSendCalls	1.3.6.1.4.1.36.2.18.29.1.8.1.1	Counter	read-only	The total number of Multicast Send establishment attempts for this BUS component.
decBusMulticastSendEntry	1.3.6.1.4.1.36.2.18.29.1.6.1		not-accessible	Each entry describes the circuits going to one LAN Emulation Client.
CTR decBusMulticastSendFailures	1.3.6.1.4.1.36.2.18.29.1.8.1.2	Counter	read-only	The number of Multicast Send establishment attempts for this BUS component which were not accepted. This includes failures counted in decBusMsOutOfResourcesFailures decBusMsInvalidInfoElements decBusMsWrongLanTypes decBusMsWrongMaxFrameSizes and any miscellaneous failures.
INT decBusMulticastSendInterface	1.3.6.1.4.1.36.2.18.29.1.6.1.1	INTEGER	read-write	If a Multicast Send PVC or SVC exists, this object has a value equal to the 'ifIndex' of the ATM port which terminates that circuit at the BUS. Otherwise it has the value 0.
INT decBusMulticastSendRowStatus	1.3.6.1.4.1.36.2.18.29.1.6.1.4	INTEGER	read-write	Used to create and delete rows in the table.
decBusMulticastSendTable	1.3.6.1.4.1.36.2.18.29.1.6		not-accessible	This optional table identifies Multicast Send VCCs at the place where they attach to the BUS. In a SVC implementation, the objects in this table will be read-only. In a PVC implementation, this table can be used to tell the BUS about the creation or the deletion of Multicast Send VCCs.
INT decBusMulticastSendVci	1.3.6.1.4.1.36.2.18.29.1.6.1.3	INTEGER	read-write	If a Multicast Send PVC or SVC exists, this object has a value equal to the VCI of the Multicast Send VCC at the point where it connects to the BUS. Otherwise, it has the value 0.
INT decBusMulticastSendVpi	1.3.6.1.4.1.36.2.18.29.1.6.1.2	INTEGER	read-write	If a Multicast Send PVC or SVC exists, this object has a value equal to the VPI of the Multicast Send VCC at the point where it connects to the BUS. Otherwise, it has the value 0.
INT decBusOperStatus	1.3.6.1.4.1.36.2.18.29.1.1.1.4	INTEGER	read-only	The operational state of this BUS component. A BUS component may not become operational until it has been configured with values for LAN Type Maximum Data Frame Size Maximum Frame Age When a BUS is in the 'disabling' or 'deleting' state, attempts to set decBusAdminStatus to 'up' will fail.
INT decBusRowStatus	1.3.6.1.4.1.36.2.18.29.1.1.1.2	INTEGER	read-write	This object is used to create and delete Broadcast and Unknown Server components. If this object is writable, it will accept the values 'createAndGo' 'destroy' under suitable conditions. Use decBusAdminStatus to enable and disable service.
INT decBusTerminating	1.3.6.1.4.1.36.2.18.29.1.2.1.3	INTEGER	read-only	The number of clients whose memberships this BUS component is in the process of terminating.
decBusTrafficEntry	1.3.6.1.4.1.36.2.18.29.1.3.1		not-accessible	A set of traffic statistics for one BUS component.
decBusTrafficGroup	1.3.6.1.4.1.36.2.18.29.2.1.3
decBusTrafficTable	1.3.6.1.4.1.36.2.18.29.1.3		not-accessible	A table of traffic statistics, with one row for each Broadcast and Unknown Server.

RFC description

Manages ATM LAN Emulation Broadcast and Unknown Server (BUS) configuration and state on Digital Equipment Corporation systems.

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Download DEC-BUS-MIB

What Is DEC-BUS-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description