CISCO-BSC-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

All MIBs › CISCO-BSC-MIB

Organization: Cisco Systems, Inc.

Last Updated: 2004-08-25

Category: Cisco Devices, SNA and Legacy Protocols, Telephony and VoIP

Description: Handles Binary Synchronous Communication (BSC) protocol links that provide SNA connectivity on Cisco routers.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock 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.

What Is CISCO-BSC-MIB?

CISCO-BSC-MIB is a Cisco Systems proprietary MIB managing BSC (Binary Synchronous Communications, a legacy IBM mainframe protocol) over BSTUN (BSC Tunneling). Its port table, keyed by ifIndex, records port role, code set, pause setting, service limit, poll timeout, recovery retries, unknown-control-unit and soft/hard error counts, protocol-violation count, host timeout, specific-poll setting, virtual address, and contention-dial timeout, while a control-unit table (keyed by port and control-unit address) records state and byte/frame counters. As a configuration/performance MIB it lets an administrator confirm a BSC control unit's error counts and state when troubleshooting a legacy mainframe-connectivity link tunneled over BSTUN. It is deployed on Cisco routers bridging BSC traffic over BSTUN. Engineers can download the CISCO-BSC-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-BSC-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 routers (BSC over BSTUN)

Monitoring Examples

An administrator checks bscPortProtocolViolations and bscCUState to diagnose a legacy BSC mainframe link exhibiting intermittent errors when tunneled over BSTUN on a Cisco router.

What Can Be Monitored

  • BSC port/control-unit error counts and state
Imported Objects

From CISCO-SMI

ciscoMgmtOBJECT-IDENTITY

From IF-MIB

ifIndexOBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TruthValue

How to Use in IPNetwork Monitor

Example using bscPortUnknownControlUnitsReceived OID:

Select a Cisco router (BSC over BSTUN, legacy) 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 bscPortUnknownControlUnitsReceived 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 count of frames received from the serial interface with an unsupported control unit address. 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 sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

Manages BSC (Binary Synchronous Communication) protocol links for SNA connectivity on Cisco routers.

Start monitoring Cisco routers (BSC over BSTUN, legacy) 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 CISCO-BSC-MIB