CISCO-ISDNU-IF-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 1996-03-18

Category: Cisco Devices, SNA and Legacy Protocols

Description: Manages ISDN U-interface configuration, line status, and performance statistics on Cisco devices.

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What Is CISCO-ISDNU-IF-MIB?

CISCO-ISDNU-IF-MIB is a Cisco enterprise MIB module for managing the ISDN BRI (Basic Rate Interface) integrated U-interface hardware found on certain Cisco router line cards, covering the physical U-loop connection to the telco network. It exposes static configuration objects (interface type) alongside operational status data including line status, EOC (embedded operations channel) command results, overhead bit settings, and loopback status, plus performance counters for far-end and near-end block errors (FEBE/NEBE). As a monitoring resource it is squarely aimed at hardware/line-level fault and performance monitoring - tracking physical line status, error-block counts, and loop test states that reveal ISDN U-interface signal quality problems - and includes an external ST-port status table for related terminal equipment. It depends on standard interface indexing conventions (ifIndex from IF-MIB) to tie its per-interface tables back to the router's interface table. It is deployed on Cisco routers with ISDN BRI U-interface WAN cards used for backup/dial WAN links or ISDN access in enterprise and small-office networks. Network engineers evaluating or troubleshooting this functionality can download the CISCO-ISDNU-IF-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-ISDNU-IF-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

Cisco router with ISDN BRI U-interface WAN card

Monitoring Examples

An administrator would poll ciuIfStatusTable/ciuIfStatusEntry (ciuIfStatus) to confirm the ISDN U-interface line is up, and check ciuIfFebeErrors and ciuIfNebeErrors for rising far-end/near-end block error counts indicating line-quality degradation on the local loop. Checking ciuIfLoopStatus reveals whether the interface has been placed into a loopback test mode, which would explain a line appearing "up" but not passing normal traffic, while ciuIfEocCommand shows the last embedded-operations-channel command exchanged with the far end for line diagnostics.

What Can Be Monitored

ISDN U-interface line status
FEBE/NEBE block error counts
loopback status
EOC command/diagnostic results
external ST-port status

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE

From SNMPv2-TC

DisplayString
TruthValue

How to Use in IPNetwork Monitor

Example using ciuIfFebeErrors OID:

Select a Cisco router with ISDN BRI U-interface WAN card as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type ciuIfFebeErrors into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. It reports the number of Far End Block Errors (FEBE) detected since last boot. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoIsdnuIfMIB	1.3.6.1.4.1.9.9.18			ISDN BRI integrated U Interface MIB module. This MIB manages the ISDN BRI integrated U Interface in the router.
ciuIfObjects	1.3.6.1.4.1.9.9.18.1
ciuInterface	1.3.6.1.4.1.9.9.18.1.1
ciuIfStaticConfigTable	1.3.6.1.4.1.9.9.18.1.1.1		not-accessible	The ISDN BRI integrated U interface Static Configuration Table. It contains items that are statically configured by reading configuration from hardware and can not be changed by end user without physically changing the U Interface.
ciuIfStaticConfigEntry	1.3.6.1.4.1.9.9.18.1.1.1.1		not-accessible	An entry in the static configuration table for each ISDN BRI integrated U interface.
INT ciuIfType	1.3.6.1.4.1.9.9.18.1.1.1.1.1	INTEGER	read-only	Specifies the type of ISDN BRI integrated U interface. other - none of the following. addOnU - An add-On card with ISDN BRI integrated U interface. onBoardU - An on board ISDN BRI integrated U interface onBoardIntegUandSTPort - An on board BRI integrated U interface with external S/T ports. addOnIntegUandSTPort - An add-on card with ISDN BRI integrated U interface and S/T port.
ciuIfStatusTable	1.3.6.1.4.1.9.9.18.1.1.2		not-accessible	The ISDN BRI integrated U interface Status Table. Contains information about the status of the ISDN U interface, including the error statistics and current active EOC (Embedded operations channel) commands from CO (Central office).
ciuIfStatusEntry	1.3.6.1.4.1.9.9.18.1.1.2.1		not-accessible	An entry in the status table for each ISDN BRI integrated U interface.
INT ciuIfStatus	1.3.6.1.4.1.9.9.18.1.1.2.1.1	INTEGER	read-only	This object contains the operation status of the ISDN BRI integrated U interface. activated - The ISDN U interface is activated. The interface is active and data can be transmitted and received through the interface. activationPending - The ISDN U interface is in activation pending state. Either the CO or the router has initiated activation of U interface, but activation has not yet completed. Data cannot be transmitted or received. deactivated - The ISDN U interface is deactivated. The ISDN line to the CO is deactivated. Data cannot be transmitted or received on the ISDN U interface.
STR ciuIfEocCommand	1.3.6.1.4.1.9.9.18.1.1.2.1.2	DisplayString	read-only	The last EOC command sent by Central Office; the ECO command supports operations communications needs between the network and ISDN U interface.
OCT ciuIfOverHeadBits	1.3.6.1.4.1.9.9.18.1.1.2.1.3	OCTET STRING	read-only	This object describes 5 attributes of Overhead bits. The Overhead bits contains the ISDN U interface transceiver operations and maintenance functions that are handled by M4, M5 and M6 bits in the superframe. These bits are described as follows: act - start-up bit; this bit is set to binary ONE by the network as a part of the start-up sequence to communicate readiness for layer-2 communication. dea - turn-off bit; this bit is set to binary ZERO by the network to communicate to the NT its intention to turn off. febe - Far End Block Error bit; this bit is set to binary ONE if there are no error in the superframe and binary ZERO if the superframe contains an error. uoa - U interface only activation bit; This bit is set to binary ONE if the S/T interface should be activated. Otherwise, this bit should be set to binary ZERO. aib - Alarm indication bit; this bit is set to binary ONE if the transmission path for D, B1, and B2 channels has been established all the way to the local exchange. Otherwise, this bit is set to binary ZERO.
C32 ciuIfFebeErrorsEx	1.3.6.1.4.1.9.9.18.1.1.2.1.4	Counter32	read-only	Number of Far End Block Errors (FEBE) detected since last boot. Whenever the CO (Central Office) receives a block of data from the router with a CRC error, the FEBE count is incremented by one.
C32 ciuIfNebeErrors	1.3.6.1.4.1.9.9.18.1.1.2.1.5	Counter32	read-only	Number of Near End Block Errors (NEBE) detected since last boot. Whenever the U transceiver receives a block of data with a CRC error, the NEBE count is incremented by one.
INT ciuIfLoopStatus	1.3.6.1.4.1.9.9.18.1.1.2.1.6	INTEGER	read-only	Current ISDN BRI integrated U interface Loop status and NT maintenance mode. The definition of maintenance modes are as follows: none - The U interface is not in either Loopback or maintenance mode. type2Loopback - Type 2 (CO to U interface) Loopback mode; this mode is set to perform the loopback between CO and the ISDN BRI integrated U interface. type3Loopback - Type 3 (processor to U interface) Loopback mode; this mode is set by router to perform the loopback between the router processor and the ISDN BRI integrated U interface. ntQuietMode - NT quiet mode; this mode is set by CO for metallic loop tests. In the NT quiet mode, the ISDN U interface will not attempt a start-up or will not initiate transmission during metallic loop tests conducted by the network. ilmtMode - Insertion loss measurement test (ILMT); this mode is set by CO for the Insertion loss measurement test. The insertion loss measurement test will cause a known test signal to be generated by the NT. This test will be used in network measurements of DSL (Digital Subscriber Line) transmission characteristics.
ciuIfExternalSTPort	1.3.6.1.4.1.9.9.18.1.2
ciuIfExternalSTPortStatusTable	1.3.6.1.4.1.9.9.18.1.2.1		not-accessible	The external S/T port status table. It contains the operation status of the external ISDN S/T ports.
ciuIfExternalSTPortStatusEntry	1.3.6.1.4.1.9.9.18.1.2.1.1		not-accessible	An entry in the status table for each external ISDN S/T port.
INT ciuIfExternalSTPortNumber	1.3.6.1.4.1.9.9.18.1.2.1.1.1	INTEGER	not-accessible	The external ISDN S/T port number.
INT ciuIfExternalSTPortStatus	1.3.6.1.4.1.9.9.18.1.2.1.1.2	INTEGER	read-only	This object contains the operation status of the external ISDN S/T port. activated - The external ISDN S/T port is activated. The port is active and data can be transmitted and received on the port. activationPending - The external ISDN S/T port is in activation pending state. Either the CO or the router has initiated activation of the port, but activation has not yet completed. Data cannot be transmitted or received. deactivated - The external ISDN S/T port is deactivated. Either no ISDN device is attached to the external S/T port or the ISDN line to the CO is deactivated. Data cannot be transmitted or received on the S/T port.
ciuIfMIBNotificationEnables	1.3.6.1.4.1.9.9.18.1.3
T/F ciuIfEnableULoopStatusNotification	1.3.6.1.4.1.9.9.18.1.3.1	TruthValue	read-write	Indicates whether or not an ISDN BRI integrated U interface Loop status notification (ciuIfLoopStatusNotification) will be generated by this router.
ciuIfMIBNotificationPrefix	1.3.6.1.4.1.9.9.18.2
ciuIfMIBNotifications	1.3.6.1.4.1.9.9.18.2.0
NTF ciuIfLoopStatusNotification	1.3.6.1.4.1.9.9.18.2.0.1			A ciuIfLoopStatusNotification is sent when there is a change in ciscoIsdnuIfLoopStatus object. The status change occurs when the ISDN BRI integrated U interface enters into or exits from Loopback or Maintenance modes.
ciuIfMIBConformance	1.3.6.1.4.1.9.9.18.3
ciuIfMIBCompliances	1.3.6.1.4.1.9.9.18.3.1
ciuIfMIBCompliance	1.3.6.1.4.1.9.9.18.3.1.1			The compliance statement for entities which implement the Cisco ISDN BRI integrated U interface MIB
ciuIfMIBGroups	1.3.6.1.4.1.9.9.18.3.2
ciuIfMIBGroup	1.3.6.1.4.1.9.9.18.3.2.1			The collection of objects providing information about the Cisco ISDN BRI integrated U interface.

RFC description

Manages ISDN BRI integrated U Interface configuration and status in Cisco routers, including external S/T port monitoring.

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Download CISCO-ISDNU-IF-MIB