ULPB-MIB

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Category: WAN and Transport Protocols

Description: Manages upper-layer protocol bridge objects for protocol filtering and bridging configuration.

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What Is ULPB-MIB?

ULPB-MIB is a vendor MIB (US Robotics/NAS lineage, given the 'usr'/'nas' object identifiers) that manages an upper-layer protocol bridge used for legacy protocol filtering and bridging configuration, likely related to SNA/LLC2 or similar link-layer session parameters. It exposes an administrative table (ulpbAdmnTable) of per-interface bridge parameters including retransmission counts, acknowledgment timers, busy/idle timers, and sliding-window sizes that govern a data-link-layer protocol's session behavior. Its monitoring value is centered on software/protocol configuration and session timing state rather than physical hardware health, letting an operator confirm timer and retry values match the expected protocol profile for a stable bridged session. It appears to be a narrowly-scoped legacy protocol MIB with no obvious dependency beyond the vendor's own enterprise MIB tree. It would typically be deployed on legacy remote access/bridging equipment supporting older mainframe or terminal protocols over WAN links. Network engineers evaluating or troubleshooting this functionality can download the ULPB-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ULPB-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

legacy protocol bridge/remote access device (US Robotics/NAS lineage)

Monitoring Examples

An operator can inspect ulpbAdmnEntry rows indexed by ulpbAdmnIndex to review per-connection settings like ulpbAdmnT1AckTime (acknowledgment timer) and ulpbAdmnN2ReXmitVal (retransmit count), confirming they match the values expected by the remote end of a bridged session. Checking ulpbAdmnRecKWindowSz and ulpbAdmnXmitKWindowSz reveals the negotiated receive/transmit window sizes, which affect throughput and error recovery for the bridged protocol. Mismatched timer or window values between the two ends of a bridge link would show up here as a likely cause of session instability or poor throughput.

What Can Be Monitored

protocol retransmit count
acknowledgment timer
link idle timer
transmit/receive window size

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter
Gauge
IpAddress
TimeTicks
enterprises
experimental

From RFC1213-MIB

DisplayString

OIDs

OID symbolic	OID numeric	Type	Access	Description
nas	1.3.6.1.4.1.429.1
ulpb	1.3.6.1.4.1.429.1.9
INT ulpbAdmnDmOnAdm	1.3.6.1.4.1.429.1.9.1.1.17	INTEGER	read-write	This parameter defines whether or not to send a DM on entry to ADM state. Default=enable(2).
ulpbAdmnEntry	1.3.6.1.4.1.429.1.9.1.1		not-accessible	Configure parameter values for a specific LAPB.
INT ulpbAdmnFrmrFrmrError	1.3.6.1.4.1.429.1.9.1.1.14	INTEGER	read-write	When the connection is in ERROR state, this parameter defines whether or not to re-transmit a frame reject if one is received. Default=disable(1).
INT ulpbAdmnFrmrInvrspError	1.3.6.1.4.1.429.1.9.1.1.15	INTEGER	read-write	When the connection is in ERROR state, this parameter defines whether or not to transmit a frame reject if an invalid frame response is received. Default=disable(1).
INT ulpbAdmnIgnUaError	1.3.6.1.4.1.429.1.9.1.1.13	INTEGER	read-write	When the connection is in ERROR state, this parameter defines whether or not to ignore any UA frames received. Default=disable(1).
INT ulpbAdmnIndex	1.3.6.1.4.1.429.1.9.1.1.1	INTEGER	read-only	A unique value for each X.25 subnetwork entity running LAPB in the chassis. The value of this object matches the value of the index of the corresponding X.25 subnetwork entity running LAPB entry in the entity table of the chassis MIB.
INT ulpbAdmnLinkIdleTime	1.3.6.1.4.1.429.1.9.1.1.7	INTEGER	read-write	The time interval during which the LAPB expexts to receive a PDU from the other LAPB. At expiration, the P/F cycle, which may result in disconnection is initiated. Value is in 0.1 second units. A value of 0 disables the timer. Default=250.
INT ulpbAdmnLocProbe	1.3.6.1.4.1.429.1.9.1.1.11	INTEGER	read-write	The position before the window is closed at which an I PDU is sent with the P-bit set to solicit an acknowledgment from the receiver. Default=0.
INT ulpbAdmnMaxRecFrmSz	1.3.6.1.4.1.429.1.9.1.1.12	INTEGER	read-write	The maximum allowable received I frame size. It consists of X25 data + x25 protocol + LAPB protocol. Default=300.
INT ulpbAdmnN2ReXmitVal	1.3.6.1.4.1.429.1.9.1.1.2	INTEGER	read-write	The maximum number of times a PDU is sent after the Ack, P-bit or Reject timer expires. It also limits RR w/P-bit sends with remote busy true and the Busy timer expiring. Default=10.
INT ulpbAdmnRecKWindowSz	1.3.6.1.4.1.429.1.9.1.1.9	INTEGER	read-write	The maximum number of unacknowledged IPDUs that can be received before the acknowledgement RR must be sent. Default=3.
INT ulpbAdmnSframePbit	1.3.6.1.4.1.429.1.9.1.1.16	INTEGER	read-write	This parameter defines whether or not to send a frame reject if an S-Frame is received without the P-bit set. Default=disable(1).
INT ulpbAdmnT1AckTime	1.3.6.1.4.1.429.1.9.1.1.3	INTEGER	read-write	The time interval during which the LAPB expects to receive a response to an outstanding IPDU or unexpected response to a sent unnumbered PDU. Value is in 0.1 second units. Default=10.
INT ulpbAdmnT2AckDelayTime	1.3.6.1.4.1.429.1.9.1.1.8	INTEGER	read-write	The maximum time delay before sending a delayed RR. This must be considerably less than the Ack time value. Value is in 0.1 second units. Default=4.
ulpbAdmnTable	1.3.6.1.4.1.429.1.9.1		not-accessible	This table defines the objects that can be changed to manage a LAPB interface. Changing one of these parameters may take effect in the operating LAPB immediately or may wait until the interface is restarted depending on the details of the implementation.
INT ulpbAdmnTbusyVal	1.3.6.1.4.1.429.1.9.1.1.6	INTEGER	read-write	The time interval during which the LAPB waits for an indication of the clearance of a busy condition at the other LAPB. Value is in 0.1 second units. Default=100.
INT ulpbAdmnTpfVal	1.3.6.1.4.1.429.1.9.1.1.4	INTEGER	read-write	The time interval during which the LAPB expects to receive a PDU with the F-bit set to 1 in response to a command with the P-bit set to 1. Value is in 0.1 second units. Default=7.
INT ulpbAdmnTrejVal	1.3.6.1.4.1.429.1.9.1.1.5	INTEGER	read-write	The time interval during which the LAPB expects to receive a reply to a sent REJ TPDU. Value is in 0.1 second units. Default=25.
INT ulpbAdmnXmitKWindowSz	1.3.6.1.4.1.429.1.9.1.1.10	INTEGER	read-write	The maximum number of unacknowledged PDUs that may be sent before a response is required. Normal Mode = 1-7. Extended Mode = 1-127. Default=7.
INT ulpbOperDmOnAdm	1.3.6.1.4.1.429.1.9.2.1.17	INTEGER	read-only
ulpbOperEntry	1.3.6.1.4.1.429.1.9.2.1		not-accessible	Entries of ulpbOperTable.
INT ulpbOperFrmrFrmrError	1.3.6.1.4.1.429.1.9.2.1.14	INTEGER	read-only
INT ulpbOperFrmrInvrspError	1.3.6.1.4.1.429.1.9.2.1.15	INTEGER	read-only
INT ulpbOperIgnUaError	1.3.6.1.4.1.429.1.9.2.1.13	INTEGER	read-only
INT ulpbOperIndex	1.3.6.1.4.1.429.1.9.2.1.1	INTEGER	read-only
INT ulpbOperLinkIdleTime	1.3.6.1.4.1.429.1.9.2.1.7	INTEGER	read-only
INT ulpbOperLocProbe	1.3.6.1.4.1.429.1.9.2.1.11	INTEGER	read-only
INT ulpbOperMaxRecFrmSz	1.3.6.1.4.1.429.1.9.2.1.12	INTEGER	read-only
INT ulpbOperN2ReXmitVal	1.3.6.1.4.1.429.1.9.2.1.2	INTEGER	read-only
INT ulpbOperRecKWindowSz	1.3.6.1.4.1.429.1.9.2.1.9	INTEGER	read-only
INT ulpbOperSframePbit	1.3.6.1.4.1.429.1.9.2.1.16	INTEGER	read-only
INT ulpbOperT1AckTime	1.3.6.1.4.1.429.1.9.2.1.3	INTEGER	read-only
INT ulpbOperT2AckDelayTime	1.3.6.1.4.1.429.1.9.2.1.8	INTEGER	read-only
ulpbOperTable	1.3.6.1.4.1.429.1.9.2		not-accessible	This table contains configuration information about interface parameters currently set in the interface. These objects are read-only.
INT ulpbOperTbusyVal	1.3.6.1.4.1.429.1.9.2.1.6	INTEGER	read-only
INT ulpbOperTpfVal	1.3.6.1.4.1.429.1.9.2.1.4	INTEGER	read-only
INT ulpbOperTrejVal	1.3.6.1.4.1.429.1.9.2.1.5	INTEGER	read-only
INT ulpbOperXmitKWindowSz	1.3.6.1.4.1.429.1.9.2.1.10	INTEGER	read-only
INT ulpbStatDISCCmdsRcvd	1.3.6.1.4.1.429.1.9.3.1.16	INTEGER	read-only	Number of DISC commands received.
INT ulpbStatDISCCmdsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.17	INTEGER	read-only	Number of DISC commands transmitted.
INT ulpbStatDMRspsRcvd	1.3.6.1.4.1.429.1.9.3.1.18	INTEGER	read-only	Number of DM response received.
INT ulpbStatDMRspsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.19	INTEGER	read-only	Number of DM response transmitted.
ulpbStatEntry	1.3.6.1.4.1.429.1.9.3.1		not-accessible	Entries of ulpbStatTrable.
INT ulpbStatFRMRRspsRcvd	1.3.6.1.4.1.429.1.9.3.1.22	INTEGER	read-only	Number of FRMR response received.
INT ulpbStatFRMRRspsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.23	INTEGER	read-only	Number of FRMR response transmitted.
INT ulpbStatIFrameCmdsRcvd	1.3.6.1.4.1.429.1.9.3.1.24	INTEGER	read-only	Number of I-frame command received.
INT ulpbStatIFrameCmdsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.25	INTEGER	read-only	Number of I-frame commands transmitted.
INT ulpbStatIndex	1.3.6.1.4.1.429.1.9.3.1.1	INTEGER	read-only	A unique value for each X.25 subnetwork entity running LAPB in the chassis. The value of this object matches the value of the index of the corresponding X.25 subnetwork entity running LAPB entry in the entity table of the chassis MIB.
INT ulpbStatREJCmdsRcvd	1.3.6.1.4.1.429.1.9.3.1.10	INTEGER	read-only	Number of REJ commands received.
INT ulpbStatREJCmdsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.11	INTEGER	read-only	Number of REJ commands transmitted.
INT ulpbStatREJRspsRcvd	1.3.6.1.4.1.429.1.9.3.1.12	INTEGER	read-only	Number of REJ responses received.
INT ulpbStatREJRspsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.13	INTEGER	read-only	Number of REJ responses transmitted.
INT ulpbStatRNRCmdsRcvd	1.3.6.1.4.1.429.1.9.3.1.6	INTEGER	read-only	Number of RNR commands received.
INT ulpbStatRNRCmdsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.7	INTEGER	read-only	Number of RNR commands transmitted.
INT ulpbStatRNRRspsRcvd	1.3.6.1.4.1.429.1.9.3.1.8	INTEGER	read-only	Number of RNR response received.
INT ulpbStatRNRRspsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.9	INTEGER	read-only	Number of RNR response transmitted.
INT ulpbStatRRCmdsRcvd	1.3.6.1.4.1.429.1.9.3.1.2	INTEGER	read-only	Number of RR commands received.
INT ulpbStatRRCmdsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.3	INTEGER	read-only	Number of RR commands transmitted.
INT ulpbStatRRRspsRcvd	1.3.6.1.4.1.429.1.9.3.1.4	INTEGER	read-only	Number of RR response received.
INT ulpbStatRRRspsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.5	INTEGER	read-only	Number or RR response transmitted.
INT ulpbStatSABMCmdsRcvd	1.3.6.1.4.1.429.1.9.3.1.14	INTEGER	read-only	Number of SABM commands received.
INT ulpbStatSABMCmdsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.15	INTEGER	read-only	Number of SABM commands transmitted.
ulpbStatTable	1.3.6.1.4.1.429.1.9.3		not-accessible	Statistics information about this LAPB interface.
INT ulpbStatUARspsRcvd	1.3.6.1.4.1.429.1.9.3.1.20	INTEGER	read-only	Number of UA response received.
INT ulpbStatUARspsTrnsmt	1.3.6.1.4.1.429.1.9.3.1.21	INTEGER	read-only	Number of UA response transmitted.
usr	1.3.6.1.4.1.429

RFC description

Manages LAPB (Link Access Procedure Balanced) interface parameters and link administration.

Start monitoring legacy protocol bridge/remote access device, US Robotics/NAS lineage (LAPB timer/retry-parameter status) 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 ULPB-MIB

What Is ULPB-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description