All MIBs › GENERIC-HDLC-MIB
Organization: Nortel Networks
Last Updated: 1999-07-01
Category: Vendor: Nortel
Description: Nortel Networks generic HDLC MIB for managing High-level Data Link Control interface configuration and statistics.
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What Is GENERIC-HDLC-MIB?
GENERIC-HDLC-MIB is a Nortel Networks enterprise MIB defining objects for configuring and monitoring generic HDLC (High-level Data Link Control) bundles used on WAN interfaces. It exposes per-interface HDLC configuration (keepalive interval, MTU) alongside a statistics table capturing traffic counters since the last boot or clear. Its monitoring role is centered on interface performance and fault status rather than physical hardware sensors: administrators can watch received/transmitted byte and packet counts (nngenHdlcStatsBytesRxLastBootClear, nngenHdlcStatsBytesTxLastBootClear, nngenHdlcStatsPktsRxLastBootClear/Tx), error-packet counts (nngenHdlcStatsErrPktsRxLastBootClear), and link up/down transition counts (nngenHdlcStatsUpDownStatesLastBootClear) to gauge link stability and error rates. It builds on generic HDLC/WAN link concepts alongside the standard IF-MIB for interface indexing. It is typically deployed on Nortel routers and WAN access devices using HDLC-framed serial links in enterprise or carrier backbone networks. Engineers can download the GENERIC-HDLC-MIB file directly to load it into their MIB browser.
IPNetwork Monitor allows you to monitor SNMP objects defined in GENERIC-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
- Nortel Networks router/WAN access device
Monitoring Examples
An administrator would poll the nngenHdlcStatsTable (nngenHdlcStatsTableEntry) to compare nngenHdlcStatsBytesRxLastBootClear/Tx and packet counts against expected throughput, and check nngenHdlcStatsErrPktsRxLastBootClear for a rising error count that could indicate a noisy or misconfigured serial line. A high nngenHdlcStatsUpDownStatesLastBootClear value would flag a flapping HDLC link needing investigation, while nngenHdlcKeepAlive and nngenHdlcMtu in the nngenHdlcTable would be checked to confirm the bundle's configured keepalive interval and MTU match expectations.
What Can Be Monitored
- HDLC link up/down transitions
- received/transmitted bytes and packets
- HDLC error packet count
- keepalive interval
- configured MTU
Imported Objects
From BUNDLE-MIB
| nnbundleId | OBJECT-TYPE |
| ntEnterpriseDataTasmanMgmt | OBJECT-IDENTITY |
From SNMPv2-SMI
| Counter32 | |
| Integer32 | |
| MODULE-IDENTITY | |
| OBJECT-TYPE |
OIDs
RFC description
Generic High-Level Data Link Control protocol management MIB; defines managed objects for HDLC interfaces independent of vendor implementation.
Start monitoring Nortel Networks router/WAN access device (generic HDLC bundles) 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.