CTINB2-MIB

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Category: Vendor: Cabletron/Enterasys

Description: Manages Cabletron INB2 second-generation internal network bus parameters, arbitration, and throughput monitoring.

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What Is CTINB2-MIB?

CTINB2-MIB is a Cabletron Systems vendor-specific MIB (from the CTRON-MIB-NAMES enterprise tree) that models utilization of a chassis's second-generation Internal Network Bus (INB2), the internal backplane channel used to move traffic between modules in a Cabletron chassis. Its single ctInbUtilTable is indexed by ctInbUtilSrcSlot and ctInbUtilDestSlot and reports, for each source/destination module pair, 64-bit byte counts split into high/low 32-bit halves for both INB channels A and B (ctInbUtilHiByteCountA/B, ctInbUtilLoByteCountA/B) along with pre-computed absolute utilization percentages (ctInbUtilAbsoluteA, ctInbUtilAbsoluteB, ctInbUtilAbsoluteTotal), scaled by 100 for precision. A single read-write scalar, ctInbUtilInterval, controls the sampling interval used for all of these calculations. Unlike what the hint description implies, the MIB as written contains no bus-arbitration objects - it is purely a backplane-throughput/utilization MIB, useful for spotting a chassis backplane channel that is saturated or a module-to-module path carrying disproportionate internal traffic. It is deployed on Cabletron multi-slot chassis systems, and administrators can download the CTINB2-MIB file to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CTINB2-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

Cabletron multi-slot chassis systems (INB2 backplane)

Monitoring Examples

An operator polls ctInbUtilTable for ctInbUtilAbsoluteTotal on a given ctInbUtilSrcSlot/ctInbUtilDestSlot pair, and a value consistently near the scaled maximum would indicate that internal backplane traffic between those two modules is saturating the INB and could be limiting inter-module throughput.

What Can Be Monitored

INB channel A/B byte counters (hi/lo)
per-slot-pair absolute utilization percentages
total INB utilization
utilization sampling interval

Imported Objects

From CTRON-MIB-NAMES

ctINBinfo2

OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

OIDs

OID symbolic	OID numeric	Type	Access	Description
ctInbUtil	1.3.6.1.4.1.52.4.1.2.12.2.1
INT ctInbUtilInterval	1.3.6.1.4.1.52.4.1.2.12.2.1.1	INTEGER	read-write	The length of the sampling interval in seconds used for all INB utilization measurements and calculations.
ctInbUtilTable	1.3.6.1.4.1.52.4.1.2.12.2.1.2		not-accessible	A list of byte counts and absolute utilization percentages reflecting data transferred via the INB during the last sampling interval.
ctInbUtilEntry	1.3.6.1.4.1.52.4.1.2.12.2.1.2.1		not-accessible	Byte counts and utilization percentages reflecting data transferred from a source module to a destination module via the INB.
INT ctInbUtilSrcSlot	1.3.6.1.4.1.52.4.1.2.12.2.1.2.1.1	INTEGER	read-only	The chassis slot number containing the module from which bytes are transmitted onto the INB.
INT ctInbUtilDestSlot	1.3.6.1.4.1.52.4.1.2.12.2.1.2.1.2	INTEGER	read-only	The chassis slot number containing the module to which bytes are transmitted across the INB.
INT ctInbUtilHiByteCountA	1.3.6.1.4.1.52.4.1.2.12.2.1.2.1.3	INTEGER	read-only	The high-order 32 bits of the 64-bit entity which represents the number of bytes transferred from the source module to the destination module across INB channel A during the last sampling interval. This 64-bit byte count may be calculated as: ctInbUtilByteCountA = (ctInbUtilHiByteCountA * 2**32) + ctInbUtilLoByteCountA
INT ctInbUtilLoByteCountA	1.3.6.1.4.1.52.4.1.2.12.2.1.2.1.4	INTEGER	read-only	The low-order 32 bits of the 64-bit entity which represents the number of bytes transferred from the source module to the destination module across INB channel A during the last sampling interval. This 64-bit byte count may be calculated as: ctInbUtilByteCountA = (ctInbUtilHiByteCountA * 2**32) + ctInbUtilLoByteCountA
INT ctInbUtilHiByteCountB	1.3.6.1.4.1.52.4.1.2.12.2.1.2.1.5	INTEGER	read-only	The high-order 32 bits of the 64-bit entity which represents the number of bytes transferred from the source module to the destination module across INB channel B during the last sampling interval. This 64-bit byte count may be calculated as: ctInbUtilByteCountB = (ctInbUtilHiByteCountB * 2**32) + ctInbUtilLoByteCountB
INT ctInbUtilLoByteCountB	1.3.6.1.4.1.52.4.1.2.12.2.1.2.1.6	INTEGER	read-only	The low-order 32 bits of the 64-bit entity which represents the number of bytes transferred from the source module to the destination module across INB channel B during the last sampling interval. This 64-bit byte count may be calculated as: ctInbUtilByteCountB = (ctInbUtilHiByteCountB * 2**32) + ctInbUtilLoByteCountB
INT ctInbUtilAbsoluteA	1.3.6.1.4.1.52.4.1.2.12.2.1.2.1.7	INTEGER	read-only	The percentage of absolute utilization of INB channel A by data transferred from the source module to the destination module during the last sampling interval. This percentage is calculated by dividing ctInbUtilByteCountA (a 64-bit entity which is calculated as specified above) by the theoretical maximum number of bytes that could have traversed INB channel A during the interval. Note that in order to increase precision, the value of this object is the actual percentage multiplied by 100 (that is, to determine the actual percentage, divide the value of this object by 100).
INT ctInbUtilAbsoluteB	1.3.6.1.4.1.52.4.1.2.12.2.1.2.1.8	INTEGER	read-only	The percentage of absolute utilization of INB channel B by data transferred from the source module to the destination module during the last sampling interval. This percentage is calculated by dividing ctInbUtilByteCountB (a 64-bit entity which is calculated as specified above) by the theoretical maximum number of bytes that could have traversed INB channel B during the interval. Note that in order to increase precision, the value of this object is the actual percentage multiplied by 100 (that is, to determine the actual percentage, divide the value of this object by 100).
INT ctInbUtilAbsoluteTotal	1.3.6.1.4.1.52.4.1.2.12.2.1.2.1.9	INTEGER	read-only	The percentage of absolute utilization of the total INB by data transferred from the source module to the destination module during the last sampling interval. This percentage is calculated by dividing the sum of ctInbUtilByteCountA and ctInbUtilByteCountB by the theoretical maximum number of bytes that could have traversed both INB channels during the interval. Note that in order to increase precision, the value of this object is the actual percentage multiplied by 100 (that is, to determine the actual percentage, divide the value of this object by 100).

RFC description

Monitors internal network backbone (INB) utilization between modules on Cabletron switches.

Start monitoring Cabletron multi-slot chassis system (INB2 backplane utilization) 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 CTINB2-MIB

What Is CTINB2-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description