All MIBs › VISM-LAPD-MIB
Category: VoIP and Telephony
Description:
Manages LAPD D-channel signaling protocol on Cisco VISM voice interworking service module.
Imported Objects
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.
What Can Be Monitored
- LAPD row/provisioning status
- D-channel signaling timers (N200/T200/T203)
- LAPD side (network/user)
- trunk type and group association
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.
OIDs
| OID symbolic | OID numeric | Type | Access | Description |
|---|---|---|---|---|
| vismLapdGrp | 1.3.6.1.4.1.351.110.5.5.12 | |||
| 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. | |
| vismLapdEntry | 1.3.6.1.4.1.351.110.5.5.12.1.1 | not-accessible | An entry for vismLapdTable. | |
| 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 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. |
| 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. |
| 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 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. |
| 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 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. |
| 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. |
| 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. |
| 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. | |
| 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. |
| CTR vismLapdRxInfoFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.2 | Counter | read-only | Information frames received. |
| CTR vismLapdTxInfoFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.3 | Counter | read-only | Information frames transmitted. |
| CTR vismLapdRxReadyFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.4 | Counter | read-only | Receiver Ready frames received. |
| CTR vismLapdTxReadyFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.5 | Counter | read-only | Receiver Ready frames transmitted. |
| 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 vismLapdTxNotReadyFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.7 | Counter | read-only | Receiver Not Ready frames transmitted. |
| 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 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 vismLapdRxDisconFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.10 | Counter | read-only | Disconnect frames received. |
| CTR vismLapdTxDisconFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.11 | Counter | read-only | Disconnect frames transmitted. |
| CTR vismLapdRxUAFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.12 | Counter | read-only | Unnumbered Acknowledge frames received. |
| CTR vismLapdTxUAFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.13 | Counter | read-only | Unnumbered Acknowledge frames transmitted. |
| CTR vismLapdRxDiscModeFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.14 | Counter | read-only | Disconnect Mode frames received. |
| CTR vismLapdTxDiscModeFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.15 | Counter | read-only | Disconnect Mode frames transmitted. |
| CTR vismLapdRxFrmRejectFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.16 | Counter | read-only | Frame Reject frames received. |
| CTR vismLapdTxFrmRejectFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.17 | Counter | read-only | Frame Reject frames transmitted. |
| CTR vismLapdRxExchIdFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.18 | Counter | read-only | Exchange Id frames received. |
| CTR vismLapdTxExchIdFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.19 | Counter | read-only | Exchange Id frames transmitted. |
| CTR vismLapdRxUnumInfoFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.20 | Counter | read-only | Unnumbered Information frames received. |
| CTR vismLapdTxUnumInfoFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.21 | Counter | read-only | Unnumbered Information frames transmitted. |
| CTR vismLapdRxRejectFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.22 | Counter | read-only | Received Reject Frames. |
| CTR vismLapdTxRejectFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.23 | Counter | read-only | Reject frames transmitted. |
| CTR vismLapdRxInvalidFrames | 1.3.6.1.4.1.351.110.5.5.12.2.1.24 | Counter | read-only | Invalid frames received. |
| 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. | |
| 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 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. |
| 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. |
| 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. |
RFC description
Controls LAPD (Link Access Procedure D-channel) configuration on Cisco VISM voice interface modules.
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