PDN-HDLC-MIB

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Organization: Paradyne Networks MIB Working Group Other information about group editing the MIB

Last Updated: 2004-09-10

Category: DSL and Broadband

Description: Manages HDLC interface framing, encapsulation mode, and error counters on Paradyne Networks DSL access devices.

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What Is PDN-HDLC-MIB?

This is a Paradyne Corporation enterprise MIB that manages HDLC (High-level Data Link Control) protocol framing and error statistics on interfaces of Paradyne DSL access devices. It exposes detailed transmit and receive statistics for HDLC-framed links, including good-frame counts, CRC errors, aborts, bad-address frames, buffer-unavailable events, receiver overruns, oversized frames, and transmit underruns. It is used to monitor the performance/fault status of the HDLC data-link layer, where a rising count of CRC errors, aborts, or receiver overruns reveals line-quality problems or clocking mismatches on the underlying DSL/leased circuit that would otherwise appear only as generic packet loss. It carries an implicit dependency on the interface being an HDLC-encapsulated link, typically layered over a physical DSL interface managed by companion Paradyne MIBs. It is typically deployed on Paradyne DSL access devices carrying HDLC-framed data circuits in carrier or enterprise access networks. Network engineers evaluating or troubleshooting this functionality can download the PDN-HDLC-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in PDN-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

Paradyne Corporation DSL access device (HDLC-framed interfaces)

Monitoring Examples

An administrator would poll pdnHdlcStatsTotalTable (via pdnHdlcStatsTotalEntry) to compare pdnHdlcStatsTotalRxGood against pdnHdlcStatsTotalRxCRCErrors and pdnHdlcStatsTotalRxAborts for a given interface. A rising pdnHdlcStatsTotalReceiverOverrun or pdnHdlcStatsTotalRxNoBufAvail count would reveal the device is dropping frames because it can't keep up with incoming HDLC traffic, indicating a buffering or CPU bottleneck. On the transmit side, pdnHdlcStatsTotalTxBufUnderrun would flag a starved transmit queue causing gaps in outbound framing, and SNMP notifications from pdnHdlcNotifications could alert operators in real time when error thresholds are crossed.

What Can Be Monitored

HDLC receive good frames vs CRC errors
receive aborts and bad-address frames
receiver overrun/buffer exhaustion events
transmit buffer underruns
oversized frame errors

Imported Objects

From IF-MIB

ifIndex

OBJECT-TYPE

From PDN-HEADER-MIB

pdn-interfaces

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using pdnHdlcStatsTotalRxGood OID:

Select a Paradyne DSL access device 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 pdnHdlcStatsTotalRxGood 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. The number of HDLC frames that were received without any errors. 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
pdnHdlcMIB	1.3.6.1.4.1.1795.2.24.2.6.26			The MIB module provides objects to manage an interface's High-level Data Link Control (HDLC) protocol.
pdnHdlcNotifications	1.3.6.1.4.1.1795.2.24.2.6.26.0
pdnHdlcObjects	1.3.6.1.4.1.1795.2.24.2.6.26.1
pdnHdlcStatsTotalTable	1.3.6.1.4.1.1795.2.24.2.6.26.1.1		not-accessible	The HDLC Total Statistics Table. This table contains counters for statistics. Counters in this group contain `total' counts which are marked from the time the system was last re-initialized.
pdnHdlcStatsTotalEntry	1.3.6.1.4.1.1795.2.24.2.6.26.1.1.1		not-accessible	An entry in the HDLC Total Statistics Table.
C32 pdnHdlcStatsTotalRxGoodEx	1.3.6.1.4.1.1795.2.24.2.6.26.1.1.1.1	Counter32	read-only	The number of HDLC frames that were received without any errors.
C32 pdnHdlcStatsTotalRxCRCErrors	1.3.6.1.4.1.1795.2.24.2.6.26.1.1.1.2	Counter32	read-only	The number of HDLC frames that were received with CRC errors.
C32 pdnHdlcStatsTotalRxAborts	1.3.6.1.4.1.1795.2.24.2.6.26.1.1.1.3	Counter32	read-only	The number of HDLC frames that were aborted during receive.
C32 pdnHdlcStatsTotalRxBadAddress	1.3.6.1.4.1.1795.2.24.2.6.26.1.1.1.4	Counter32	read-only	The number of HDLC frames that were discarded due to a bad address.
C32 pdnHdlcStatsTotalRxNoBufAvail	1.3.6.1.4.1.1795.2.24.2.6.26.1.1.1.5	Counter32	read-only	The number of HDLC frames that were discarded because no receive buffers were available.
C32 pdnHdlcStatsTotalReceiverOverrun	1.3.6.1.4.1.1795.2.24.2.6.26.1.1.1.6	Counter32	read-only	The number of times a receiver overrun occurred.
C32 pdnHdlcStatsTotalRxMaxSizeExceeded	1.3.6.1.4.1.1795.2.24.2.6.26.1.1.1.7	Counter32	read-only	The number of times a frame was received which was discarded due to the frame size exceeding the maximum frame size for the receiver.
C32 pdnHdlcStatsTotalTx	1.3.6.1.4.1.1795.2.24.2.6.26.1.1.1.8	Counter32	read-only	The number of HDLC frames transmitted.
C32 pdnHdlcStatsTotalTxBufUnderrun	1.3.6.1.4.1.1795.2.24.2.6.26.1.1.1.9	Counter32	read-only	The number of times a transmitter underrun occurred.
pdnHdlcAFNs	1.3.6.1.4.1.1795.2.24.2.6.26.2
pdnHdlcConformance	1.3.6.1.4.1.1795.2.24.2.6.26.3
pdnHdlcCompliances	1.3.6.1.4.1.1795.2.24.2.6.26.3.1
pdnHdlcCompliance	1.3.6.1.4.1.1795.2.24.2.6.26.3.1.1			The compliance statement for network elements implementing HDLC Protocol.
pdnHdlcGroups	1.3.6.1.4.1.1795.2.24.2.6.26.3.2
pdnHdlcObjGroups	1.3.6.1.4.1.1795.2.24.2.6.26.3.2.1
pdnHdlcStatsTotalGroup	1.3.6.1.4.1.1795.2.24.2.6.26.3.2.1.1			Displays various HDLC related total counters.
pdnHdlcAfnGroups	1.3.6.1.4.1.1795.2.24.2.6.26.3.2.2
pdnHdlcNtfyGroups	1.3.6.1.4.1.1795.2.24.2.6.26.3.2.3

RFC description

Manages High-level Data Link Control (HDLC) protocol statistics and configuration on Paradyne network interfaces.

Start monitoring Paradyne DSL access devices 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 PDN-HDLC-MIB