Nortel-MsCarrier-MscPassport-BusMIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsNortel-MsCarrier-MscPassport-BusMIB

Category: ATM Networking, Nortel MsCarrier MscPassport

Description: Defines SNMP objects for ATM LAN Emulation BUS (Broadcast and Unknown Server) on Nortel MsCarrier MscPassport.

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What Is Nortel-MsCarrier-MscPassport-BusMIB?

This Nortel MsCarrier MscPassport MIB manages the ATM LAN Emulation Broadcast and Unknown Server (BUS) function, which handles broadcast, multicast, and unknown-destination frames within an ATM LAN Emulation (LANE) network on the Passport switch. It provides objects for BUS "tap" components at the shelf/card level, including row-status provisioning and a state table exposing administrative, operational, and usage state for each BUS tap. This gives operators direct hardware/software status visibility -- the operational state and usage state fields indicate whether the BUS function on a given shelf/card is actually up and handling traffic versus administratively disabled or degraded, functioning as a health indicator for that ATM card. It is built on the standard ATM Forum LAN Emulation architecture and Nortel's own shelf/card component-addressing scheme used across the MsCarrier Passport MIB family. It is deployed in ATM-based Passport switches providing emulated LAN services (e.g., bridging legacy Ethernet/Token Ring segments) over an ATM backbone. Engineers can download the Nortel-MsCarrier-MscPassport-BusMIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in Nortel-MsCarrier-MscPassport-BusMIB. 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

  • Nortel MsCarrier MscPassport ATM switch

Monitoring Examples

An operator would poll mscShelfCardBusTapStateTable/mscShelfCardBusTapStateEntry for mscShelfCardBusTapOperationalState and mscShelfCardBusTapUsageState to confirm the BUS function on a given shelf/card is operational and actively used rather than idle or disabled. A discrepancy between mscShelfCardBusTapAdminState (up) and the operational state (down) would indicate a card or ATM interface fault preventing the BUS from servicing broadcast/unknown traffic. mscShelfCardBusTapRowStatus is checked to confirm the tap component itself is provisioned and active.

What Can Be Monitored

  • BUS tap administrative state
  • BUS tap operational state
  • BUS tap usage state
  • BUS component row status
Imported Objects

From Nortel-MsCarrier-MscPassport-BaseShelfMIB

mscShelfOBJECT-IDENTITY
mscShelfCardOBJECT-IDENTITY
mscShelfCardIndexOBJECT-TYPE
mscShelfIndexOBJECT-TYPE

From Nortel-MsCarrier-MscPassport-StandardTextualConventionsMIB

DisplayString
Integer32
RowStatus
StorageType
Unsigned32

From Nortel-MsCarrier-MscPassport-UsefulDefinitionsMIB

mscPassportMIBsOBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE
OIDs

RFC description

Nortel MsCarrier Passport platform MIB for bus tap and cell-switching management on carrier equipment.

Start monitoring Nortel MsCarrier MscPassport ATM switch (LANE Broadcast/Unknown Server) 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 Nortel-MsCarrier-MscPassport-BusMIB