DEC BUS MIB

Configuration Table
Client States Table
Traffic Table
Client Table
LEC Table
Call Statistics Table
Event Log Maximum Size
Event Log Table

Configuration Table

UP_ARROW138B.GIF (883 bytes)
The Configuration Table is a table that describes all the Broadcast and Unknown Server components implemented by this managed device.

Fields Descriptions

decBusIndex A unique number greater than zero which identifies this table row.
decBusRowStatus 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.

decBusAdminStatus 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.

decBusOperStatus 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.

decBusLastChange 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.
decBusAtmAddress 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.

decBusDescription A human-readable string which can contain anything the network manager wants.
decBusLanName 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.

REFERENCE:
ATM Forum LAN Emulation Over ATM Specification, V1.0, Section 5.1.1.

decBusLanType 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'.

REFERENCE:
ATM Forum LAN Emulation Over ATM Specification, V1.0, Section 5.1.2.

decBusMaxDataFrameSize 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'.

REFERENCE:
ATM Forum LAN Emulation Over ATM Specification, V1.0, Section 5.1.2.

decBusMaxFrameAge 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.

REFERENCE:
ATM Forum LAN Emulation Over ATM Specification, V1.0, Section 5.1.2.

decBusMaxForwardingRate The maximum rate at which this Broadcast and Unknown Server will forward frames.

 

Client States Table

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The Client States Tables is a  table describing how many clients are in various membership states.

Fields Descriptions

decBusActiveClients The number of active clients of this BUS component.

This count only includes those clients which have both Multicast Send and Multicast Forward VCCs.

decBusMulticastFwdInProgress The number of clients to which this BUS component is currently establishing Multicast Forward VCCs.
decBusTerminating The number of clients whose memberships this BUS component is in the process of terminating.

 

Traffic Table

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The Traffic Table is a table of traffic statistics, with one row for each Broadcast and Unknown Server.

Fields Descriptions

decBusFramesForwarded The number of frames successfully forwarded by this Broadcast and Unknown Server.
decBusInvalidFrames The number of frames which were discarded because of errors (such as invalid frame length).
decBusFramesAgedOut The number of frames which were discarded because delay exceeded the Maximum Frame Age.
decBusFramesRateLimited The number of frames which were discarded in order to enforce 'decBusMaxForwardingRate'.
decBusFramesDiscarded The number of frames which could not be forwarded, even though no errors had been detected, and the frames had not aged out.

 

Client Table

up-arrow138b.gif (883 bytes)
The Client Table is a table listing clients of the emulated LANs that this node serves.

This table reflects the actual membership of each emulated LAN, as opposed to the desired membership.

Fields Descriptions

DecBusClientIndex A unique value for each table row. This value has no predefined relation to a client's LECID.
decBusClientAtmAddress The primary ATM address of the LAN Emulation Client.
decBusClientID Contains the first LECID the appropriate BUS has seen for this client, or zero if none has been seen yet.
decBusClientUsedSeveralIDs 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.
decBusClientState Indicates the status of this LEC from the server's perspective.
decBusClientRowStatus 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.

 

LEC Table

up-arrow138b.gif (883 bytes)
The LEC Table is a table listing clients that belong to the emulated LANs that this node serves.

Fields Descriptions

decBusLecAtmAddress The primary ATM address of the LAN Emulation Client.
decBusLecIndex The client's index in the 'decBusClientTable'. Note that this value is NOT the client's LEC-ID.
decBusLecID Contains the first LECID the appropriate BUS has seen for this client, or zero if none has been seen yet.
decBusLecUsedSeveralIDs 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.
decBusLecState Indicates the status of this LEC from the server's perspective.
decBusLecRowStatus 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.

 

Call Statistics Table

up-arrow138b.gif (883 bytes)
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'.

Fields Descriptions

decBusMulticastSendCalls

The total number of Multicast Send establishment attempts for this BUS component.

decBusMulticastSendFailures

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.

decBusMsOutOfResourcesFailures

The number of Multicast Send establishment attempts for this BUS component which failed for lack of resources.

decBusMsInvalidInfoElements

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.

decBusMsWrongLanTypes

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.

decBusMsWrongMaxFrameSizes

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.

decBusMulticastForwardCalls

The number of Multicast Forward connections which this BUS tried to establish.

decBusMulticastForwardFailures

The number of Multicast Forward connections which this BUS was unable to establish.

This includes failures counted in

  • decBusMfOutOfResourcesFailures

  • decBusMfClientRejects

and any miscellaneous failures.

decBusMfOutOfResourcesFailures

The number of Multicast Forward connections which this BUS component could not establish due to lack of resources.

decBusMfClientRejects

The number of Multicast Forward connections which this BUS component's clients refused to accept.

 

Event Log Maximum Size

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Fields Descriptions

decBusEventLogMaximumSize The minimum number of events which the agent should remember before purging old log entries to make way for new ones.

 

Event Log Table

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A table of event log entries for the emulated LANs that this node serves.

Fields Descriptions

decBusEventIndex A unique number greater than zero which identifies this table row.
decBusEventType 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.

decBusEventReason The cause of the failure.
DecBusEventServer 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.

decBusEventServerAtmAddress The ATM address of the Broadcast and Unknown Server that was involved in this incident.
decBusEventClientAtmAddress If known, the ATM address of the LAN Emulation Client that was involved in this incident.
decBusEventTimestamp 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.