VISM-LAPD-MIB

All MIBs › VISM-LAPD-MIB

Category: VoIP and Telephony

Description: Manages LAPD D-channel signaling protocol on Cisco VISM voice interworking service module.

Start monitoring vendor-neutral, standards-based MIB, any SNMPv3-capable network device (SNMP engine identity/boot/clock status) 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.

What Is VISM-LAPD-MIB?

VISM-LAPD-MIB is a Cisco vendor MIB for the Voice Interworking Service Module (VISM), used to manage the LAPD (Link Access Procedure on the D-channel) signaling protocol layer for ISDN-based voice trunking. It exposes per-D-channel configuration such as application type, window size, N200/T200/T203 protocol timers, LAPD side (network/user), and trunk type/group, along with row status for provisioning. Its monitoring role is primarily configuration/protocol-state oriented — verifying that LAPD signaling parameters and row status (active/inactive) are correctly provisioned so D-channel signaling stays up, since a misconfigured timer or an inactive row can prevent call signaling from establishing. It operates as an ISDN/LAPD (Q.921-based) protocol MIB layered under Cisco's VISM voice interworking architecture. It is typically deployed on Cisco VISM/VISM-PR service modules in Cisco MGX/AXIS voice gateway platforms. Engineers can download the VISM-LAPD-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in VISM-LAPD-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 modules (MGX/AXIS platforms)

Monitoring Examples

An admin polls vismLapdTable/vismLapdEntry keyed by vismLapdIndex to check vismLapdRowStatus and vismLapdSide for a given D-channel, along with timer values vismLapdT200/vismLapdT203/vismLapdN200. If vismLapdRowStatus shows the row is not active or timer values were changed unexpectedly, that would explain a trunk group (vismLapdTrunkType/vismLapdGrp) failing to establish ISDN signaling.

What Can Be Monitored

LAPD row/provisioning status
D-channel signaling timers (N200/T200/T203)
LAPD side (network/user)
trunk type and group association

Imported Objects

From BASIS-MIB

voice

OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

Counter

OIDs

OID symbolic	OID numeric	Type	Access	Description
INT vismLapdAppType	1.3.6.1.4.1.351.110.5.5.12.1.1.2	INTEGER	read-write	This object indicates the type of the LAPD interface. When the user creates a LAPD entry this object need to be specified. After creation it cannot be modified.
vismLapdDlcEntry	1.3.6.1.4.1.351.110.5.5.12.3.1		not-accessible	An entry for vismLapdDlcTable.
INT vismLapdDlcIndex	1.3.6.1.4.1.351.110.5.5.12.3.1.1	INTEGER	read-only	This object identifies the corresponding LAPD index. It is the same as vismLapdIndex.
INT vismLapdDlcLinkState	1.3.6.1.4.1.351.110.5.5.12.3.1.4	INTEGER	read-only	This object indicate the linking state on a given DLC.
INT vismLapdDlcSapi	1.3.6.1.4.1.351.110.5.5.12.3.1.2	INTEGER	read-only	This is the SAPI of a specific DLC.
vismLapdDlcTable	1.3.6.1.4.1.351.110.5.5.12.3		not-accessible	This table is used for maintaining the link state of different DLCs on a LAPD channel. An entry of this table will be implicitly created some time after a LAPD entry is added.
INT vismLapdDlcTei	1.3.6.1.4.1.351.110.5.5.12.3.1.3	INTEGER	read-only	This is the TEI of a specific DLC.
vismLapdEntry	1.3.6.1.4.1.351.110.5.5.12.1.1		not-accessible	An entry for vismLapdTable.
vismLapdGrp	1.3.6.1.4.1.351.110.5.5.12
INT vismLapdIndex	1.3.6.1.4.1.351.110.5.5.12.1.1.1	INTEGER	read-only	This is the logical index for this table. This is derived from the following formula: index = 31 * (Ds1# - 1) + ds0# where : Ds1# - The T1/E1 line number in the range 1 - 8. ds0# - The ds0 channel number ranging from 1 to 24 for T1 and 1 to 31 for E1. Currently the range of 1 to 248 is used.
INT vismLapdN200	1.3.6.1.4.1.351.110.5.5.12.1.1.4	INTEGER	read-write	The maximum number of retransmissions of a frame.
INT vismLapdRowStatus	1.3.6.1.4.1.351.110.5.5.12.1.1.8	INTEGER	read-write	Row status allows users to create or delete a LAPD entry. CreateAndGo: Use this to add an entry in this table. Before create a LAPD entry session manager should already be set up. i.e. session set, group and session(s) have been created. Before creating a LAPD entry the entry in Hdlc table will implicitly created first. If the DS0 has already been used then the request of creating a LAPD channel on the same DS0 on the same line will be rejected. After creating the LAPD entry the corresponding entry in vismLapdStatsTable will be implicitly created. active: When an entry is created it becomes active. destory: Use this to delete an entry in this table. After implicitly deleting all the entries(if there is any) in vismLapdDlcEntry table for the specific D channel the entry in vismLapdEntry will be deleted, then the entry in vismLapdStatsTable will be implicitly deleted, followed by the deletion of the Hdlc entry.
CTR vismLapdRxDiscModeFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.14	Counter	read-only	Disconnect Mode frames received.
CTR vismLapdRxDisconFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.10	Counter	read-only	Disconnect frames received.
CTR vismLapdRxExchIdFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.18	Counter	read-only	Exchange Id frames received.
CTR vismLapdRxFrmRejectFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.16	Counter	read-only	Frame Reject frames received.
CTR vismLapdRxInfoFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.2	Counter	read-only	Information frames received.
CTR vismLapdRxInvalidFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.24	Counter	read-only	Invalid frames received.
CTR vismLapdRxNotReadyFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.6	Counter	read-only	Receiver Not Ready frames received.
CTR vismLapdRxReadyFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.4	Counter	read-only	Receiver Ready frames received.
CTR vismLapdRxRejectFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.22	Counter	read-only	Received Reject Frames.
CTR vismLapdRxSABMFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.8	Counter	read-only	Set Asynchronous Balanced Mode frames received.
CTR vismLapdRxUAFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.12	Counter	read-only	Unnumbered Acknowledge frames received.
CTR vismLapdRxUnumInfoFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.20	Counter	read-only	Unnumbered Information frames received.
INT vismLapdSide	1.3.6.1.4.1.351.110.5.5.12.1.1.9	INTEGER	read-write	This object specifies whether LAPD stack is on the user side or network side. This object can be set when the row is created. It can not be modified for an existing row.
vismLapdStatsEntry	1.3.6.1.4.1.351.110.5.5.12.2.1		not-accessible	An entry in the LAPD Table.
INT vismLapdStatsIndex	1.3.6.1.4.1.351.110.5.5.12.2.1.1	INTEGER	read-only	This is the logical index for this table. It is the same as vismLapdIndex. An entry of this table will be implicitly created when a LAPD entry is added.
vismLapdStatsTable	1.3.6.1.4.1.351.110.5.5.12.2		not-accessible	This table contains statistics information for all LAPD (D channel Data Link) interfaces on VISM.
INT vismLapdT200	1.3.6.1.4.1.351.110.5.5.12.1.1.5	INTEGER	read-write	The maximum number of time in milliseconds to wait for acknowledgement for a transmit frame. Transmission may be initiated. This value should be less than vismLapdT203Timer. For PRI, the range is 1000 ms to 1023000 ms. The default is 1000 ms. For GR-303, the range is 100 ms to 350 ms in increments of 50 ms. The default value is 150 ms.
INT vismLapdT203	1.3.6.1.4.1.351.110.5.5.12.1.1.6	INTEGER	read-write	The maximum time (in milliseconds) allowed without frames being exchanged. This value should be greater than vismLapdT200. For PRI, the range is 1000 to 1023000 and the default is 10000 ms. For GR-303, the range is 10000 to 300000 ms in increments of 10000 ms. The default is 30000 ms.
vismLapdTable	1.3.6.1.4.1.351.110.5.5.12.1		not-accessible	This table is used for maintaining the configuration of the LAPD channel on VISM.
INT vismLapdTrunkType	1.3.6.1.4.1.351.110.5.5.12.1.1.10	INTEGER	read-only	This object indicates if the line is configured for Trunking or PRI Backhaul. This object is set to the appropriate type when the vismRudpSessionType parameter in the vismRudpSessionCnfEntry table is set. The motivation to have similar such objects at two places is for convenience.
CTR vismLapdTxDiscModeFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.15	Counter	read-only	Disconnect Mode frames transmitted.
CTR vismLapdTxDisconFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.11	Counter	read-only	Disconnect frames transmitted.
CTR vismLapdTxExchIdFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.19	Counter	read-only	Exchange Id frames transmitted.
CTR vismLapdTxFrmRejectFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.17	Counter	read-only	Frame Reject frames transmitted.
CTR vismLapdTxInfoFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.3	Counter	read-only	Information frames transmitted.
CTR vismLapdTxNotReadyFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.7	Counter	read-only	Receiver Not Ready frames transmitted.
CTR vismLapdTxReadyFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.5	Counter	read-only	Receiver Ready frames transmitted.
CTR vismLapdTxRejectFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.23	Counter	read-only	Reject frames transmitted.
CTR vismLapdTxSABMFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.9	Counter	read-only	Set Asynchronous Balanced Mode frames transmitted.
CTR vismLapdTxUAFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.13	Counter	read-only	Unnumbered Acknowledge frames transmitted.
CTR vismLapdTxUnumInfoFrames	1.3.6.1.4.1.351.110.5.5.12.2.1.21	Counter	read-only	Unnumbered Information frames transmitted.
INT vismLapdType	1.3.6.1.4.1.351.110.5.5.12.1.1.7	INTEGER	read-write	This object specifies what type of interface the LAPD stack will be used with. ccitt(1) : CCITT att5EssPRA(3) : AT&T 5ESS PRA att4Ess(4) : AT&T 4ESS ntDMS100PRA(6) : NT dms100 PRA vn2or3(7) : VN 2 or VN 3 insNet(8) : INS Net tr6MPC(9) : tr6 MPC tr6PBX(10) : tr6 PBX ausp(12) : Austel Primary ni1(13) : National ISDN-1 etsi(14) : ETSI bc303TMC(15) : Bellcorp tr303 tmc bc303CSC(16) : Bellcorp tr303 csc ntDMS250(17) : NT dms250 bellcore(18) : Bellcore ni2(19) : National ISDN-2
INT vismLapdWinSize	1.3.6.1.4.1.351.110.5.5.12.1.1.3	INTEGER	read-write	The window size - maximum number of sequencially numbered I-frames that may be outstanding. VISM support window size range 1 to 127.

RFC description

Controls LAPD (Link Access Procedure D-channel) configuration on Cisco VISM voice interface modules.

Start monitoring Cisco VISM voice interworking service modules (MGX/AXIS platforms) (LAPD D-channel timer/row-status status) 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 VISM-LAPD-MIB

What Is VISM-LAPD-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description