CISCO-VISM-HDLC-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2003-10-09

Category: Cisco Devices, Telephony and VoIP

Description: Manages HDLC channel configuration and statistics for data backhaul on Cisco VISM Voice Interworking Service Modules.

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What Is CISCO-VISM-HDLC-MIB?

CISCO-VISM-HDLC-MIB is a Cisco enterprise MIB for the Voice Interworking Service Module (VISM), a card used in Cisco carrier/access platforms to backhaul voice and signaling traffic over HDLC-framed channels. It exposes per-channel configuration and traffic statistics for the HDLC channels carrying VISM's data backhaul, including frame counts, error counts, and channel row status/administration. Its monitoring focus is on hardware interface performance and fault status: vismHdlcXmtFrames/vismHdlcRcvFrames give transmit/receive frame throughput per channel, while vismHdlcRcvCrcErrors, vismHdlcRcvBufOverflows, and vismHdlcTxUnderflows/vismHdlcTxAbortFrames reveal line-quality problems or buffering issues on a specific HDLC channel that could be degrading voice backhaul quality. It is part of Cisco's broader VISM MIB family (alongside signaling-group MIBs referenced by vismSigGrp) and is specific to Cisco's VISM hardware rather than an IETF standard. It is deployed on Cisco access/voice-gateway platforms carrying VISM service modules used for TDM-to-packet voice interworking with HDLC-based backhaul links. Network engineers evaluating or troubleshooting this functionality can download the CISCO-VISM-HDLC-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-VISM-HDLC-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) card

Monitoring Examples

An operator would walk vismHdlcChanTable/vismHdlcChanEntry, indexed by vismHdlcChanNum, checking vismHdlcRowStatus to confirm the channel is active, then comparing vismHdlcXmtFrames/vismHdlcRcvFrames against vismHdlcRcvCrcErrors and vismHdlcRcvBufOverflows to spot a channel with rising CRC errors or buffer overflows, indicating line noise or congestion affecting voice quality. vismHdlcTxUnderflows and vismHdlcTxAbortFrames would be checked on the transmit side for a channel suffering from a starved or aborting HDLC transmitter. vismHdlcMaxFrameSize and vismHdlcLcnNum would be reviewed when validating that a channel's provisioning matches the expected backhaul configuration.

What Can Be Monitored

HDLC channel transmit/receive frame counts
CRC error count
receive buffer overflow count
transmit underflow/abort frame count
channel row status/administration

Imported Objects

From BASIS-MIB

voice

OBJECT-IDENTITY

From CISCOWAN-SMI

ciscoWan

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

RowStatus

How to Use in IPNetwork Monitor

Example using vismHdlcXmtFrames 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 vismHdlcXmtFrames 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 maintains the count of HDLC frames transmitted to the HDLC channel on VISM. 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 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
ciscoVismHdlcCompliance	1.3.6.1.4.1.351.150.91.2.2.1			The compliance statement for objects related to VISM HDLC module.
ciscoVismHdlcDeprecateGroup	1.3.6.1.4.1.351.150.91.2.1.2			The collection of objects that were supported earlier but deprecated now.
ciscoVismHdlcGroup	1.3.6.1.4.1.351.150.91.2.1.1			The collection of objects which are used to represent VISM HDLC module.
ciscoVismHdlcMIB	1.3.6.1.4.1.351.150.91			The MIB module containing table for configurating and maintaining counters for the HDLC channel on VISM service module.
ciscoVismHdlcMIBCompliances	1.3.6.1.4.1.351.150.91.2.2
ciscoVismHdlcMIBConformance	1.3.6.1.4.1.351.150.91.2
ciscoVismHdlcMIBGroups	1.3.6.1.4.1.351.150.91.2.1
vismHdlcChanEntry	1.3.6.1.4.1.351.110.5.5.6.1.1		not-accessible	An entry for each HDLC channel.
I32 vismHdlcChanNum	1.3.6.1.4.1.351.110.5.5.6.1.1.1	Integer32	read-only	This object is the index of this table. It refers to the ds0IfIndex in the dsx0VismCnfTable (defined in CISCO-VISM-DSX0-MIB MIB).
vismHdlcChanTable	1.3.6.1.4.1.351.110.5.5.6.1		not-accessible	This table is used for maintaining the statistics info for the HDLC channels on VISM. It also keeps track of some configurable parameters required for proper operation of HDLC driver in VISM.
I32 vismHdlcLcnNum	1.3.6.1.4.1.351.110.5.5.6.1.1.4	Integer32	read-create	This object describes LCN(Logical Channel Number) or the PVC(Permanent Virtual Circuit) channel number with which the HDLC channel is associated with. It is applicable only for trunking applications where the CCS frames are transmitted to the other end point over an AAL5 PVC. For PRI or GR-303 applications, this is not applicable since the CCS frames in that case are backhauled to the call agent.
I32 vismHdlcMaxFrameSize	1.3.6.1.4.1.351.110.5.5.6.1.1.3	Integer32	read-only	This object describes the maximum frame size that is allowed on this HDLC channel. This value is not configurable. The value for this object is 264.
C32 vismHdlcRcvBufOverflows	1.3.6.1.4.1.351.110.5.5.6.1.1.8	Counter32	read-only	This object describes the count of HDLC receiver buffer overflow condition. This can occur if the rate of arrival of HDLC frames from the line is more than the processing rate by the CPU.
C32 vismHdlcRcvCrcErrors	1.3.6.1.4.1.351.110.5.5.6.1.1.7	Counter32	read-only	This object describes the count of HDLC frames dropped due to CRC(Cyclic Redundancy Check) errors in the frames received from the HDLC channel.
C32 vismHdlcRcvFrames	1.3.6.1.4.1.351.110.5.5.6.1.1.6	Counter32	read-only	This object maintains the count of HDLC frames received from the HDLC channel on VISM.
ROW vismHdlcRowStatus	1.3.6.1.4.1.351.110.5.5.6.1.1.2	RowStatus	read-create	This variable allows to add, delete or modify the entry. 'createAndGo': Use this to add an entry in this table. There are two case of creating a entry: 1) a CCS (Common Channel Signaling) channel is explicitly created for AAL2 Trunking. In this case, if the DS0 already created for PRI(Primary Rate Interface) or GR-303 the request of creation should be rejected. 2) A HDLC entry will be implicitly created before creating a LAPD(D channel Data Link) entry. In this case if the DS0 is already used for AAL2 trunking the request should be rejected. No entry in LAPD shall be created. 'active': This values is returned, once the row is created 'destroy': Use this to delete an entry from this table. According to the creation, an entry can be explicitly destroyed or implicitly removed.
C32 vismHdlcRxAbortFrames	1.3.6.1.4.1.351.110.5.5.6.1.1.11	Counter32	read-only	This object describes the count of HDLC Abort frames received.
C32 vismHdlcTxAbortFrames	1.3.6.1.4.1.351.110.5.5.6.1.1.10	Counter32	read-only	This object describes the count of HDLC Abort frames transmitted.
C32 vismHdlcTxUnderflows	1.3.6.1.4.1.351.110.5.5.6.1.1.9	Counter32	read-only	This object describes the count of HDLC Tx underflow condition.
C32 vismHdlcXmtFramesEx	1.3.6.1.4.1.351.110.5.5.6.1.1.5	Counter32	read-only	This object maintains the count of HDLC frames transmitted to the HDLC channel on VISM.
vismSigGrp	1.3.6.1.4.1.351.110.5.5.6

RFC description

Manages configuration and performance counters for HDLC channels on Cisco VISM service modules.

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