CISCO-VISM-CONN-STAT-MIB

All MIBs › CISCO-VISM-CONN-STAT-MIB

Organization: Cisco Systems, Inc.

Last Updated: 2005-09-26

Category: ATM, Cisco Devices, Telephony and VoIP

Description: Monitors ATM connection statistics including cell counts and error rates for voice trunks on Cisco VISM modules.

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What Is CISCO-VISM-CONN-STAT-MIB?

CISCO-VISM-CONN-STAT-MIB belongs to Cisco's Voice Interworking Service Module (VISM) product line, used in Cisco voice gateways/switches to carry voice traffic over ATM using AAL2. It exposes per-channel connection statistics -- cell counts, error counts, and lost/invalid cell counters for the ATM Adaptation Layer 2 (AAL2) transport underlying each voice channel. Its central purpose is performance and fault monitoring of individual voice trunk channels: HEC errors, CRC errors, lost cells, and invalid CID/OSF cell counts reveal transmission-layer degradation that would manifest to users as call quality problems, dropped calls, or garbled audio. It relies on the underlying ATM/AAL2 transport standards and is typically deployed alongside other Cisco voice-gateway MIBs covering trunk and interface configuration. It is used in legacy Cisco voice-over-ATM deployments (e.g., MGX/VISM-based voice gateways) to monitor per-channel voice trunk health. Network engineers evaluating or troubleshooting this functionality can download the CISCO-VISM-CONN-STAT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-VISM-CONN-STAT-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 VISM (Voice Interworking Service Module) voice gateways
Cisco MGX-based voice-over-ATM platforms

Monitoring Examples

vismChanCntGrpTable/vismChanCntGrpEntry, indexed by vismCntChanNum, exposes counters like vismChanAal2HecErrors, vismChanAal2CrcErrors, and vismChanAal2OamLpbLostCells for each voice channel. An admin polling these counters over time and seeing them climb would identify a specific channel suffering ATM-layer cell loss or corruption, which correlates with poor call quality on that trunk; vismCntClrButton lets the operator reset the counters after investigating.

What Can Be Monitored

per-channel AAL2 HEC/CRC error counts
lost or invalid cell counts
CPS packet sent/received counts
invalid CID packet counts
voice channel transport health

Imported Objects

From BASIS-MIB

vismChanGrp

OBJECT-IDENTITY

From CISCOWAN-SMI

ciscoWan

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

How to Use in IPNetwork Monitor

Example using vismChanAal2HecErrors OID:

Select a Cisco VISM (Voice Interworking Service Module) card, MGX platform (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 vismChanAal2HecErrors 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. This object keep count of egress AAL2(ATM Adaptation layer 2) CPS(Common Part Sub-layer) PDU(Protocol Data Unit) dropped due to HEC(Header Error Control) error. 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 between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoVismConnStatCompliance	1.3.6.1.4.1.351.150.89.2.2.1			The compliance statement for objects related to VISM channel counters.
ciscoVismConnStatCompliance1	1.3.6.1.4.1.351.150.89.2.2.2			The compliance statement for objects related to VISM channel counters.
ciscoVismConnStatCompliance2	1.3.6.1.4.1.351.150.89.2.2.3			The compliance statement for objects related to VISM channel counters.
ciscoVismConnStatCompliance3	1.3.6.1.4.1.351.150.89.2.2.4			The compliance statement for objects related to VISM channel counters.
ciscoVismConnStatGroup	1.3.6.1.4.1.351.150.89.2.1.1			The collection of objects which are used to represent VISM channel counter group.
ciscoVismConnStatGroup1	1.3.6.1.4.1.351.150.89.2.1.2			The collection of objects which are used to represent VISM channel counter group.
ciscoVismConnStatGroup2	1.3.6.1.4.1.351.150.89.2.1.3			The collection of objects which are used to represent VISM channel counter group.
ciscoVismConnStatGroup3	1.3.6.1.4.1.351.150.89.2.1.4			The collection of objects which are used to represent VISM channel counter group.
ciscoVismConnStatMIB	1.3.6.1.4.1.351.150.89			The MIB module contain VISM channel counters information.
ciscoVismConnStatMIBCompliances	1.3.6.1.4.1.351.150.89.2.2
ciscoVismConnStatMIBConformance	1.3.6.1.4.1.351.150.89.2
ciscoVismConnStatMIBGroups	1.3.6.1.4.1.351.150.89.2.1
C32 vismChan24HrPeakRcvCellRate	1.3.6.1.4.1.351.110.5.5.3.3.1.1.28	Counter32	read-only	This object counts the peak receive cell rate (cells per second) for the channel since midnight with reference to node time; the peak cell rate counter gets reset to 0 every 24 hours at midnight. If the node time is changed, the counter will continue to gather data until the next time midnight is reached.
C32 vismChan24HrPeakXmtCellRate	1.3.6.1.4.1.351.110.5.5.3.3.1.1.26	Counter32	read-only	This object counts the peak transmit cell rate (cells per second) for the channel since midnight with reference to node time; the peak cell rate counter gets reset to 0 every 24 hours at midnight. If the node time is changed, the counter will continue to gather data until the next time midnight is reached.
C32 vismChanAal2CpsInvCidPkts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.18	Counter32	read-only	This object keeps track of AAL2 CPS packets dropped in the egress direction due to invalid CID(Channel Identifier). The CID may be considered as invalid if it is out of range or not configured.
C32 vismChanAal2CpsInvLenPkts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.20	Counter32	read-only	This object keeps track of AAL2 CPS packets dropped in the egress direction due to invalid length field.
C32 vismChanAal2CpsInvUuiPkts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.19	Counter32	read-only	This object keeps track of AAL2 CPS packets dropped in the egress direction due to invalid UUI (User-to-User Information) field.
C32 vismChanAal2CpsRcvdPkts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.17	Counter32	read-only	This object keeps track of AAL2 CPS packets received from the network. This does not include the packets which are counted as error packets.
C32 vismChanAal2CpsSentPkts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.16	Counter32	read-only	This object keeps track of the number of AAL2 CPS packets sent to the network.
C32 vismChanAal2CrcErrors	1.3.6.1.4.1.351.110.5.5.3.3.1.1.12	Counter32	read-only	This object keeps track of egress AAL2 Type3 CPS PDUs dropped due to invalid CRC-10(Cyclic redundancy check) error. CRC validation is for Type 3 packets only. Type 1 packets are not subjected to CRC-10 error validation. Also this counter keeps track of CRC-10 errors for the Type 3 packets which are generated by the the datamover CPU only. It does not take into account of Type 3 packets generated by the DSP(Digital Signal Processing).
C32 vismChanAal2HecErrorsEx	1.3.6.1.4.1.351.110.5.5.3.3.1.1.11	Counter32	read-only	This object keep count of egress AAL2(ATM Adaptation layer 2) CPS(Common Part Sub-layer) PDU(Protocol Data Unit) dropped due to HEC(Header Error Control) error.
C32 vismChanAal2InvOsfCells	1.3.6.1.4.1.351.110.5.5.3.3.1.1.14	Counter32	read-only	This object keeps track of the number AAL2 cells dropped due to invalid OSF (OffSet Field) in the egress direction.
C32 vismChanAal2InvParCells	1.3.6.1.4.1.351.110.5.5.3.3.1.1.15	Counter32	read-only	This object keeps track of the number of AAL2 cells dropped due to invalid Parity bit field in the egress direction.
C32 vismChanAal2OamLpbLostCells	1.3.6.1.4.1.351.110.5.5.3.3.1.1.13	Counter32	read-only	This object keeps track of the number of OAM(Operation and management) loopback cells lost. OAM loopback cells are sent on a periodic basis (1 sec) on each PVC(Permanent Virtual Circuit) to monitor the health of the PVC.
C32 vismChanAal5Crc32ErrorPdus	1.3.6.1.4.1.351.110.5.5.3.3.1.1.24	Counter32	read-only	This object counts the number of AAL5 PDUs dropped in the egress direction due to CRC-32 errors detected by the SAR(Segmentation and Reassembly).
C32 vismChanAal5InvCpiPdus	1.3.6.1.4.1.351.110.5.5.3.3.1.1.21	Counter32	read-only	This object counts the number of AAL5 PDUs dropped in the egress direction due to invalid CPI(Common Part Indicator) field in the AAL5 PDU trailer. This is applicable only to the PVCs configured as AAL5 PVCs (VoIP(Voice Over IP) PVCs or CCS(Common Channel Signaling) PVCs in the case of VoAAL2 application.
C32 vismChanAal5InvLenPdus	1.3.6.1.4.1.351.110.5.5.3.3.1.1.23	Counter32	read-only	This object counts the number of AAL5 PDUs dropped due to the length violations. This is applicable to the CCS PVCs. The HDLC(High Level Data Link Control) frames should have a minimum frame size in order for the proper interpretation by the upper layer protocol.
C32 vismChanAal5OversizedSdusRcvdPdus	1.3.6.1.4.1.351.110.5.5.3.3.1.1.22	Counter32	read-only	This object counts the number AAL5 PDUs dropped due to the SDU(Service Data Unit) size bigger than the configured value. This is applicable for AAL5 PVCs only.
C32 vismChanAal5PduRcvdPkts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.36	Counter32	read-only	This object counts the number of AAL5 PDUs received from the network. This is only applicable to the PVCs configured as AAL5 PVCs, VoIP (Voice Over IP) PVCs or CCS (Common Channel Signaling) PVCs in the case of VoAAL2 applications.
C32 vismChanAal5PduSentPkts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.35	Counter32	read-only	This object counts the number of AAL5 PDUs transmitted to the network. This is only applicable to the PVCs configured as AAL5 PVCs, VoIP (Voice Over IP) PVCs or CCS (Common Channel Signaling) PVCs in the case of VoAAL2 applications.
C32 vismChanAal5ReassemTimerExpiryPdus	1.3.6.1.4.1.351.110.5.5.3.3.1.1.25	Counter32	read-only	This object counts of AAL5 PDU reassembly timer expirations. The timers are maintained in the egress direction for building an AAL5 PDU from the cells.
U32 vismChanAisDelayLeft	1.3.6.1.4.1.351.110.5.5.3.3.1.1.37	Unsigned32	read-only	The real-time number of seconds remaining for the AIS delay timer after which the ATM alarm will be propagated to the TDM side. This object is tied to the vismChanAisDelayTime object in the CISCO-VISM-CONN-MIB. vismChanAisDelayTime will store the configurable AIS delay timer. The delay time left (vismChanAisDelayLeft) will be equal to the delay time in vismChanAisDelayTime until an AIS alarm is received at which point it starts to decrement and could go down to 0 and propagate the alarm to the TDM side.
C32 vismChanAisSuppressCount	1.3.6.1.4.1.351.110.5.5.3.3.1.1.30	Counter32	read-only	This object holds the number of times that ATM network alarms were successfully suppressed and prevented from propagating onto the TDM side for this PVC.
vismChanCntGrp	1.3.6.1.4.1.351.110.5.5.3.3
vismChanCntGrpEntry	1.3.6.1.4.1.351.110.5.5.3.3.1.1		not-accessible	An entry for each voice channel.
vismChanCntGrpTable	1.3.6.1.4.1.351.110.5.5.3.3.1		not-accessible	vismChanCntGrpTable contains VISM channels counters.
C32 vismChanCurrentRcvCellRate	1.3.6.1.4.1.351.110.5.5.3.3.1.1.29	Counter32	read-only	This object counts the current receive cell rate (cells per second) for the channel.
C32 vismChanCurrentXmtCellRate	1.3.6.1.4.1.351.110.5.5.3.3.1.1.27	Counter32	read-only	This object counts the current transmit cell rate (cells per second) for the channel.
C32 vismChanOamLpbkTimeoutCnts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.38	Counter32	read-only	The number of instances that OAM loopback timeout alarm has occurred since the system was last re-initialized.
U32 vismChanOamLpbkTimeoutDuration	1.3.6.1.4.1.351.110.5.5.3.3.1.1.39	Unsigned32	read-only	The total duration of OAM loopback timeout alarms since the system was last re-initialized.
C32 vismChanRcvAisCnts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.32	Counter32	read-only	The number of instances that an ATM AIS alarm was received.
C32 vismChanRcvFerfCnts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.34	Counter32	read-only	The number of instances that an ATM FERF alarm was received.
C32 vismChanXmtAisCnts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.31	Counter32	read-only	The number of instances that an ATM AIS alarm was transmitted.
C32 vismChanXmtFerfCnts	1.3.6.1.4.1.351.110.5.5.3.3.1.1.33	Counter32	read-only	The number of instances that an ATM FERF alarm was transmitted.
I32 vismCntChanNum	1.3.6.1.4.1.351.110.5.5.3.3.1.1.1	Integer32	read-only	This object identifies the LCN(Logical Channel Number) on the VISM.
INT vismCntClrButton	1.3.6.1.4.1.351.110.5.5.3.3.1.1.10	INTEGER	read-only	This object is use to either reset counters or perform no action(do not clear counters).

RFC description

VISM voice module channel counters and connection statistics for WAN ATM networks.

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Download CISCO-VISM-CONN-STAT-MIB