CNT245-MIB

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Organization: Computer Network Technology Corporation

Last Updated: 2001-10-01

Category: Fibre Channel and Storage, Vendor: CNT

Description: Handles interconnect status and switching equipment for the CNT 2.45 Fibre Channel series.

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What Is CNT245-MIB?

CNT245-MIB is a vendor MIB from CNT (Computer Network Technology) covering the 2.45 series Fibre Channel switching and interconnect equipment, with particular focus on the device's compression engine functionality. It exposes objects related to Fibre Channel switch/interconnect status and the operation of onboard data compression used to optimize storage-network (SAN) link utilization. As a monitoring tool it would be used to check the hardware/link status of Fibre Channel interconnects and the health/throughput behavior of the compression engine, which is relevant to diagnosing SAN performance degradation or compression-related errors. It likely depends on Fibre Channel-related standard MIB concepts (e.g., FC management conventions) for its port/interconnect modeling, though the exact relationship is not detailed in the available module description. It is deployed in storage-area network (SAN) environments where CNT Fibre Channel switches/directors extend or interconnect SAN fabrics over distance, often with data compression for WAN-based SAN extension, and SAN administrators frequently load the module into a CNT245-MIB MIB Browser to inspect its compression-engine and interconnect objects.

IPNetwork Monitor allows you to monitor SNMP objects defined in CNT245-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

CNT 2.45 series Fibre Channel switch/director
SAN extension/interconnect appliance

Monitoring Examples

An administrator monitoring SAN extension links would check compression-engine status and throughput objects to confirm the compression engine is active and effectively reducing data volume across a long-distance Fibre Channel link, and would review interconnect/port status to detect a failed or degraded FC link. No sample objects were available for this module in the source data, so this description generalizes from the stated 'Compression Engine MIB' purpose rather than citing specific object names.

What Can Be Monitored

Fibre Channel interconnect/port status
compression engine operational state
compression throughput/efficiency
link status for SAN extension

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

enterprises

From SNMPv2-SMI

Counter64
Integer32
MODULE-IDENTITY

How to Use in IPNetwork Monitor

Example using cnt2BytesToCompress OID:

Select a CNT 2.45-series Fibre Channel switch/compression engine (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 cnt2BytesToCompress 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. The number of bytes submitted to the engine for compression. 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 Counter64-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

OID symbolic	OID numeric	Type	Access	Description
cnt2Compression	1.3.6.1.4.1.333.2.4.5			This defines the CNT Compression Engine MIB
cnt2CompressionTable	1.3.6.1.4.1.333.2.4.5.1		not-accessible	A list of compression/decompression engines on this system.
cnt2CompressionEntry	1.3.6.1.4.1.333.2.4.5.1.1		not-accessible	An instance of a compression/decompression.
I32 cnt2CompressionSlotIndex	1.3.6.1.4.1.333.2.4.5.1.1.1	Integer32	read-only	The slot number where this compression/ decompression was done. This index matches cnt2SlotIndex.
I32 cnt2CompressionIndex	1.3.6.1.4.1.333.2.4.5.1.1.2	Integer32	read-only	The relative instance of the compression/decompression engine for this slot. This index is always 1.
C64 cnt2BytesToCompressEx	1.3.6.1.4.1.333.2.4.5.1.1.3	Counter64	read-only	The number of bytes submitted to the engine for compression. This value will include all bytes submitted whether or not compression was successful. This value will always be equal or larger than cnt2CompressedBytes.
C64 cnt2CompressedBytes	1.3.6.1.4.1.333.2.4.5.1.1.4	Counter64	read-only	The number of bytes received from the engine after compression. This value will include all of the bytes received from the engine whether or not compres- sion was successful, since the engine returns the initial size in any unsucces- sful attempt at compression. This value will be equal or smaller than cnt2BytesToCompress.
C64 cnt2BytesToDecompress	1.3.6.1.4.1.333.2.4.5.1.1.5	Counter64	read-only	The number of bytes submitted to the engine for decompression. This value will include all bytes submitted whether or not decompression was successful. This value will always be equal or smaller than cnt2DecompressedBytes.
C64 cnt2DecompressedBytes	1.3.6.1.4.1.333.2.4.5.1.1.6	Counter64	read-only	The number of bytes received from the engine after decompression. This value will include all of the bytes received from the engine whether or not decompres- sion was successful, since the engine returns the initial size in any unsucces- sful attempt at decompression. This value will be equal or larger than cnt2BytesToDecompress.
I32 cnt2ifCompressionNumber	1.3.6.1.4.1.333.2.4.5.2	Integer32	read-only	The number of interfaces using compression/ decompression in this system.
cnt2ifCompressionTable	1.3.6.1.4.1.333.2.4.5.3		not-accessible	A list of interface entries using compression/ decompression in this system. The number of entries is given by cnt2ifCompressionNumber.
cnt2ifCompressionEntry	1.3.6.1.4.1.333.2.4.5.3.1		not-accessible	An interface entry using compression/ decompression.
I32 cnt2ifCompressionSlotIndex	1.3.6.1.4.1.333.2.4.5.3.1.1	Integer32	read-only	The slot number where this compression was done. This index matches cnt2IfSlotIndex.
I32 cnt2ifCompressionIndex	1.3.6.1.4.1.333.2.4.5.3.1.2	Integer32	read-only	The local interface index on which this compression was done. This index matches cnt2IfIndex.
C64 cnt2ifCompressedOctets	1.3.6.1.4.1.333.2.4.5.3.1.3	Counter64	read-only	The number of bytes that were compressed out of the transmitted data stream. To calculate the compression ratio for trans- mitted data, the following calculation would be used: ifOutOctets + cnt2ifCompressedOctets ------------------------------------ ifOutOctets. to calculate the overall compression for this interface, the following calculation would be used: ifOutOctets + cnt2ifCompressedOctets + cnt2ifDecompressedOctets + ifInOctets -------------------------------------- ifOutOctets + ifInOctets.
I32 cnt2ifCompressionRatio	1.3.6.1.4.1.333.2.4.5.3.1.4	Integer32	read-only	The Compression ratio for this index. The value is represent of 1 to xx.xx Compression Ratio. Example: Ratio of 1:15.82 would have this set to a value of 1582. The internal Calculation is done as: 100 * (ifOutOctets + cnt2ifCompressedOctets) --------------------------------------------- ifOutOctets Then the result is mod by 100 for floating point. This OID gets created dynamically when there is a compression circuit active.
cnt2ifDecompressionTable	1.3.6.1.4.1.333.2.4.5.4		not-accessible	A list of interface entries using decompression in this system. The number of entries is given by cnt2ifCompressionNumber.
cnt2ifDecompressionEntry	1.3.6.1.4.1.333.2.4.5.4.1		not-accessible	An interface entry using decompression.
I32 cnt2ifDecompressionSlotIndex	1.3.6.1.4.1.333.2.4.5.4.1.1	Integer32	read-only	The slot number where this decompression was done. This index matches cnt2IfSlotIndex.
I32 cnt2ifDecompressionIndex	1.3.6.1.4.1.333.2.4.5.4.1.2	Integer32	read-only	The local interface index on which this decompression was done. This index matches cnt2IfIndex.
C64 cnt2ifDecompressedOctets	1.3.6.1.4.1.333.2.4.5.4.1.3	Counter64	read-only	The number of bytes that were compressed out of the received data stream. To calculate the compression ratio for received data, the following calculation would be used: ifInOctets + cnt2ifDeCompressedOctets ------------------------------------- ifInOctets to calculate the overall compression for this interface, the following calculation would be used: ifOutOctets + cnt2ifCompressedOctets + cnt2ifDecompressedOctets + ifInOctets -------------------------------------- ifOutOctets + ifInOctets.
I32 cnt2ifDecompressionRatio	1.3.6.1.4.1.333.2.4.5.4.1.4	Integer32	read-only	The Decompression ratio for this index. The value is represent 1 to xx.xx decompression Ratio. Example: Ratio of 13.82 :1 would have this set to a value of 1382. The internal Calculation is done as: 100 * (ifInOctets + cnt2ifDeCompressedOctets) --------------------------------------------- ifInOctets Then the result is mod by 100 for floating point. This OID gets created dynamically when there is a decompression circuit active.

RFC description

Manages CNT 2.45 series Fibre Channel switching equipment and interconnect status.

Start monitoring CNT 2.45-series Fibre Channel switch/compression engine (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.

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