IBMESCONCUB-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

All MIBs › IBMESCONCUB-MIB

Category: Domain: SNA/Legacy, SNA and Legacy Protocols, Vendor: IBM

Description: IBM MIB for ESCON Control Unit Buffer (CUB) management providing channel buffer utilization statistics.

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What Is IBMESCONCUB-MIB?

IBMESCONCUB-MIB is an IBM mainframe-networking MIB for ESCON (Enterprise Systems Connection) channel management, specifically covering Control Unit Buffer style channel port and link status under the ibmIROC (IBM channel-router) architecture. It exposes port tables describing fiber-optic signal status (in/out fiber) and link tables mapping host link addresses to control unit and partition addresses, reflecting the physical and logical topology of ESCON channel connections. Its monitoring focus is hardware/link-level fault detection: fiber status objects reveal whether the optical signal on an ESCON port is present and healthy, while link status confirms whether a specific host-to-control-unit link is currently established, critical for diagnosing mainframe channel connectivity problems. It is part of IBM's proprietary channel/ESCON architecture and does not depend on IETF standard MIBs, instead reflecting IBM mainframe I/O subsystem concepts. It is deployed on IBM mainframe channel-attached networking equipment (ESCON directors/converters) connecting mainframes to control units and storage, and administrators typically import the module into an IBMESCONCUB-MIB MIB Browser session to explore these fiber and link status objects before configuring SNMP polling.

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

  • IBM mainframe ESCON channel director/converter

Monitoring Examples

An admin would poll esconPortTable/esconPortEntry for esconPortInFiberStatus and esconPortOutFiberStatus to confirm optical signal presence on each ESCON port, and check esconLinkTable/esconLinkEntry's esconLinkStatus for a given esconLinkHostLinkAddress/esconLinkControlUnitAddress pair; a fiber status showing loss of signal or a link status showing down reveals a broken mainframe channel connection.

What Can Be Monitored

  • ESCON port fiber signal status (in/out)
  • host-to-control-unit link status
  • link partition number
  • control unit address mapping
Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1213-MIB

ifIndex

From SNMPv2-SMI

Counter32
Integer32
IpAddress
enterprises

From SNMPv2-TC

MacAddress
OIDs

RFC description

ESCON channel management MIB for monitoring ESCON port status, link data, and station information from the secondary end.

Start monitoring IBM mainframe ESCON channel director/converter 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 IBMESCONCUB-MIB