Wellfleet-LAPB-MIB

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Category: Wellfleet BayNetworks WAN Interfaces

Description: Monitors Wellfleet LAPB data link layer parameters, frame sequencing, and X.25 error statistics.

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What Is Wellfleet-LAPB-MIB?

The Wellfleet-LAPB-MIB is a Wellfleet Communications proprietary MIB covering the Link Access Procedure, Balanced (LAPB) data-link layer used beneath X.25 packet networks on Wellfleet routers. It exposes per-link configuration and state objects along with frame sequencing and error-statistics counters for the LAPB layer. Its monitoring focus is link/software health: operators use it to confirm the data-link state machine is in a stable connected state and to watch retransmission and sequence-error counters that indicate an unstable or noisy serial link beneath the X.25 service. It is closely tied to, and typically deployed alongside, the companion Wellfleet-X25-MIB since LAPB is the frame-level transport for X.25 packet-layer sessions. It was used on Wellfleet/Bay Networks routers acting as X.25 packet-switching or PAD gateways in legacy carrier and financial-network environments. Engineers can download the Wellfleet-LAPB-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in Wellfleet-LAPB-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

Wellfleet router
Bay Networks/Nortel router with X.25/LAPB WAN links

Monitoring Examples

An engineer polls the LAPB link state objects to confirm the data-link is in the balanced/connected state rather than cycling through disconnect-reconnect, then reviews the frame sequencing and retransmission counters. A rising count of retransmitted or out-of-sequence frames on an otherwise 'connected' link typically points to line noise or a timer mismatch with the remote DTE/DCE that will eventually cause the X.25 session above it to drop.

What Can Be Monitored

LAPB link connection state
frame sequencing counters
retransmission/error statistics
data-link timer configuration

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter

From Wellfleet-COMMON-MIB

wfDataLink

OBJECT-IDENTITY

OIDs

OID symbolic	OID numeric	Type	Access	Description
wfLapbTable	1.3.6.1.4.1.18.3.5.1.8		not-accessible	******************************************************************** LAPB MIB record *******************************************************************
wfLapbEntry	1.3.6.1.4.1.18.3.5.1.8.1		not-accessible	An entry in the LAPB table
INT wfLapbDelete	1.3.6.1.4.1.18.3.5.1.8.1.1	INTEGER	read-write	Create/Delete parameter
INT wfLapbDisable	1.3.6.1.4.1.18.3.5.1.8.1.2	INTEGER	read-write	Enable/Disable parameter
INT wfLapbState	1.3.6.1.4.1.18.3.5.1.8.1.3	INTEGER	read-only	Line Driver state variable, Not Present, DSR Wait, Init, Down, Up
INT wfLapbLineNumber	1.3.6.1.4.1.18.3.5.1.8.1.4	INTEGER	read-only	Instance identifier, Line Number, filled in by LAPB
INT wfLapbLLIndex	1.3.6.1.4.1.18.3.5.1.8.1.5	INTEGER	read-only	Instance identifier, Lower Layer Index, filled in by LAPB
INT wfLapbCct	1.3.6.1.4.1.18.3.5.1.8.1.6	INTEGER	read-only	CCT number for this LAPB subsystem, it is associated with the driver or application running underneath it.
INT wfLapbStationType	1.3.6.1.4.1.18.3.5.1.8.1.7	INTEGER	read-write	Identifies the desired station type of this interface. A value of DxE indicates XID enabled but not negotiation has not yet taken place.
INT wfLapbControlField	1.3.6.1.4.1.18.3.5.1.8.1.8	INTEGER	read-write	This parameter establishes the desired size of the sequence numbers used to number frames.
INT wfLapbN1FrameSize	1.3.6.1.4.1.18.3.5.1.8.1.9	INTEGER	read-write	The default maximum N1 frame size desired in number of bytes for a frame transmitted by the DxE. This excludes flags and 0 bits inserted for transparency.
INT wfLapbKWindowSize	1.3.6.1.4.1.18.3.5.1.8.1.10	INTEGER	read-write	The default transmit and receive window size for this Interface. This is the maximum number of unacknowledged sequence frames that may be outstanding from this DxE at any one time.
INT wfLapbN2RxmitCount	1.3.6.1.4.1.18.3.5.1.8.1.11	INTEGER	read-write	The default N2 retry count indicates the number of retransmission attempts which will be tried per frame before a line is determined to be down. The retry count is max attempts following expiration of the T1 timer.
INT wfLapbT1AckTimer	1.3.6.1.4.1.18.3.5.1.8.1.12	INTEGER	read-write	The default T1 timer for this interface. This specifies the maximum time in tenths of seconds to wait for an acknowledgment of a frame.
INT wfLapbT2AckDelayTimer	1.3.6.1.4.1.18.3.5.1.8.1.13	INTEGER	read-write	The default T2 timer for this interface. This specifies the maximum time in seconds to wait before sending an acknowledgment for a sequenced frame. A value of one means there will be no delay in acknowledgment generation.
INT wfLapbT3DisconnectTimer	1.3.6.1.4.1.18.3.5.1.8.1.14	INTEGER	read-write	The T3 timer for this interface. This specifies the time in seconds to wait before considering the link disconnected. A value of one indicates the link will be considered disconnected upon completion of the frame exchange to disconnect the link.
INT wfLapbT4IdleTimer	1.3.6.1.4.1.18.3.5.1.8.1.15	INTEGER	read-write	The T4 timer for this interface. This specifies the maximum time in seconds to allow without frames being exchanged on the data link. Not implemented for this project.
INT wfLapbActionInitiate	1.3.6.1.4.1.18.3.5.1.8.1.16	INTEGER	read-write	This identifies the action LAPB will take to initiate link set-up.
INT wfLapbXidDisable	1.3.6.1.4.1.18.3.5.1.8.1.17	INTEGER	read-write	XID enable/disable parameter. This parameter is used to enable or disable transmission/reception of Test XID frames.
INT wfLapbCommandAddress	1.3.6.1.4.1.18.3.5.1.8.1.18	INTEGER	read-write	The local command address parameter contains the DTE or DCE value expressed as a single octet.
INT wfLapbResponseAddress	1.3.6.1.4.1.18.3.5.1.8.1.19	INTEGER	read-write	The local response address parameter contains the DTE or DCE value expressed as a single octet.
INT wfLapbWanProtocol	1.3.6.1.4.1.18.3.5.1.8.1.20	INTEGER	read-write	WAN protocol selection is provided via this parameter. The supported protocols can be selected per interface.
CTR wfLapbRxOctets	1.3.6.1.4.1.18.3.5.1.8.1.21	Counter	read-only	Number of octets received without error
CTR wfLapbRxFrames	1.3.6.1.4.1.18.3.5.1.8.1.22	Counter	read-only	Number of frames received without error
CTR wfLapbTxOctets	1.3.6.1.4.1.18.3.5.1.8.1.23	Counter	read-only	Number of octets transmitted without error
CTR wfLapbTxFrames	1.3.6.1.4.1.18.3.5.1.8.1.24	Counter	read-only	Number of frames transmitted without error
CTR wfLapbReXmits	1.3.6.1.4.1.18.3.5.1.8.1.25	Counter	read-only	Number of retransmission occurances
CTR wfLapbRejectsTx	1.3.6.1.4.1.18.3.5.1.8.1.26	Counter	read-only	Number of reject frames which were transmitted
CTR wfLapbRejectsRx	1.3.6.1.4.1.18.3.5.1.8.1.27	Counter	read-only	Number of reject frames which were received
CTR wfLapbFrameRejectsTx	1.3.6.1.4.1.18.3.5.1.8.1.28	Counter	read-only	Number of Frame Rejects transmitted
CTR wfLapbFrameRejectsRx	1.3.6.1.4.1.18.3.5.1.8.1.29	Counter	read-only	Number of Frame Rejects received
CTR wfLapbRRsTx	1.3.6.1.4.1.18.3.5.1.8.1.30	Counter	read-only	Number of Receiver Ready frames transmitted
CTR wfLapbRRsRx	1.3.6.1.4.1.18.3.5.1.8.1.31	Counter	read-only	Number of Receiver Ready frames received
CTR wfLapbRNRsTx	1.3.6.1.4.1.18.3.5.1.8.1.32	Counter	read-only	Number of Receiver Not Ready frames transmitted
CTR wfLapbRNRsRx	1.3.6.1.4.1.18.3.5.1.8.1.33	Counter	read-only	Number of Receiver Not Ready frames received
CTR wfLapbResets	1.3.6.1.4.1.18.3.5.1.8.1.34	Counter	read-only	Number of Link Connection Resets
CTR wfLapbNormalDisc	1.3.6.1.4.1.18.3.5.1.8.1.35	Counter	read-only	Number of normal link disconnections
CTR wfLapbAbnormalDisc	1.3.6.1.4.1.18.3.5.1.8.1.36	Counter	read-only	Number of abnormal link disconnections
CTR wfLapbSetupAllowed	1.3.6.1.4.1.18.3.5.1.8.1.37	Counter	read-only	Number of successful link connections
CTR wfLapbSetupRefused	1.3.6.1.4.1.18.3.5.1.8.1.38	Counter	read-only	Number of unsuccessful link connections
INT wfLapbNetworkType	1.3.6.1.4.1.18.3.5.1.8.1.39	INTEGER	read-write	The types GOSIP and NET2 are used in conjunction with the X.25 network
INT wfLapbIdleRRFrames	1.3.6.1.4.1.18.3.5.1.8.1.40	INTEGER	read-write	XID enable/disable parameter. This parameter is used to enable or disable transmission/reception of Test XID frames.
INT wfLapbClientType	1.3.6.1.4.1.18.3.5.1.8.1.41	INTEGER	read-write	This parameter is used to describe the client above the LAPB protocol layer. By default, the client is the X.25 Packet layer. Currently, the only other selection is ipex or none.
INT wfLapbRetransmitTimer	1.3.6.1.4.1.18.3.5.1.8.1.42	INTEGER	read-write	The Retransmit timer for this interface. This specifies the maximum time in seconds to allow without retransmitting frames after RNR and RR received on this interface.

RFC description

A Wellfleet Communications implementation of RFC 1381 providing SNMP management objects for X.25 Link Access Procedure, Balanced (LAPB) protocol management on Wellfleet networking equipment.

Start monitoring Wellfleet/Bay Networks/Nortel routers with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download Wellfleet-LAPB-MIB

What Is Wellfleet-LAPB-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description