APPIAN-LPORT-HDLC-MIB

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Organization: Appian Communications, Inc.

Last Updated: 2000-03-19

Category: Optical and WDM, Vendor: Appian

Description: Appian Communications logical port HDLC encapsulation configuration and statistics.

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What Is APPIAN-LPORT-HDLC-MIB?

APPIAN-LPORT-HDLC-MIB is a vendor-specific MIB from Appian Communications, a maker of broadband access and multiservice WAN equipment, and it models the HDLC (High-Level Data Link Control) encapsulation used on logical ports carried over the device's physical interfaces. It exposes configuration data such as the node ID, slot, and HDLC type for each logical port, alongside a rich set of receive-side error counters. It is squarely a fault/performance monitoring MIB for HDLC-framed WAN links: an operator uses it to track hardware-level link health indicators like FIFO overruns, frame check sequence (FCS) errors, non-octet-aligned frames, packet aborts, and maximum-packet-length violations, all of which signal cabling, clocking, or framing problems on the underlying transmission media. There is an implicit dependency on the standard IF-MIB ifIndex-style addressing since HDLC logical ports typically map onto physical slot/port interfaces, though this module keeps its own node/slot/index scheme. It would typically be deployed on Appian multiservice access platforms carrying HDLC-encapsulated WAN circuits (e.g., leased lines or TDM-based links) where an NMS polls the stats table periodically to detect rising error rates before they cause service-affecting outages. Engineers can download the APPIAN-LPORT-HDLC-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in APPIAN-LPORT-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

Appian Communications multiservice WAN access platform

Monitoring Examples

An administrator would poll acLogicalHdlcTable / acLogicalHdlcEntry, indexed by acLogicalHdlcNodeId, acLogicalHdlcSlot, and acLogicalHdlcIndex, to retrieve per-port counters such as acLogicalHdlcRxFifoOverrun, acLogicalHdlcRxFCSError, acLogicalHdlcRxNonOctetAligned, and acLogicalHdlcRxHdlcPktAbort. A sudden jump in acLogicalHdlcRxFCSError alongside acLogicalHdlcRxNonOctetAligned would point to a line clocking or cabling problem on that logical port, while acLogicalHdlcRxMaxPktLenViolation growth could indicate a misconfigured MTU on the far end. acLogicalHdlcStatsReset lets the operator zero the counters after remediation to re-baseline monitoring.

What Can Be Monitored

HDLC logical port configuration
receive FIFO overruns
frame check sequence (FCS) errors
non-octet-aligned frame errors
maximum packet length violations
HDLC packet abort count

Imported Objects

From APPIAN-SMI-MIB

AcNodeId
AcSlotNumber
acLport	OBJECT-IDENTITY

From SNMPv2-SMI

Counter64
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TruthValue

How to Use in IPNetwork Monitor

Example using acLogicalHdlcRxFifoOverrun OID:

Select an Appian Communications OSAP SONET/optical access 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 acLogicalHdlcRxFifoOverrun 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 total number of receive FIFO overruns that occurred in the hdlc controller for this specified channel number. 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 Counter64-type OID, Value bounds is the most useful condition here — trigger an alert if the reported value exceeds the level expected for healthy operation, since sustained high temperature often precedes thermal shutdown or hardware degradation. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
acLogicalHdlc	1.3.6.1.4.1.2785.2.4.4			Appian Communications HDLC Configuration and Statistics MIB.
acLogicalHdlcTable	1.3.6.1.4.1.2785.2.4.4.1		not-accessible	A table containing the statistics parameters for HDLC data streams on the SONET board. The index key used is type.channel.
acLogicalHdlcEntry	1.3.6.1.4.1.2785.2.4.4.1.1		not-accessible	A row in the HDLC table containing all HDLC level statistics and configuration for a specific HDLC data stream on the SONET board.
ACN acLogicalHdlcNodeId	1.3.6.1.4.1.2785.2.4.4.1.1.1	AcNodeId	accessible-for-notify	The node id is the id for this specific node in the OSAP ring.
ACS acLogicalHdlcSlot	1.3.6.1.4.1.2785.2.4.4.1.1.2	AcSlotNumber	accessible-for-notify	The slot number within the chassis where the stats reside.
INT acLogicalHdlcType	1.3.6.1.4.1.2785.2.4.4.1.1.3	INTEGER	accessible-for-notify	The type of data stream that this hdlc channel is framing. The current options are DS1, DS3, or DCC.
INT acLogicalHdlcIndex	1.3.6.1.4.1.2785.2.4.4.1.1.4	INTEGER	accessible-for-notify	The acLogicalHdlcIndex is the index for this table for the specified type. For DS1 and DS3, the index is the same as the index in the timeslot table that this entity corresponds. For the case of Appian DCC, the index simply a number from 1-4.
T/F acLogicalHdlcStatsReset	1.3.6.1.4.1.2785.2.4.4.1.1.5	TruthValue	read-write	Setting this attribute to True(1) will force all statistics for this row to be cleared and set to zero (0) values. Used for debugging, clearing statistics can trouble with trending and long term statistics collection by AppianVista or 3rd party trending tools.
C64 acLogicalHdlcRxFifoOverrunEx	1.3.6.1.4.1.2785.2.4.4.1.1.6	Counter64	read-only	The total number of receive FIFO overruns that occurred in the hdlc controller for this specified channel number. This error occurs when attemps are made to write data to a channel which is already full.
C64 acLogicalHdlcRxMaxPktLenViolation	1.3.6.1.4.1.2785.2.4.4.1.1.7	Counter64	read-only	The total number of receive max packet packet length violations that occurred in the hdcl controller for the specified channel number. This error occurs when an hdlc packet is received that is greater than the maximum packet length which is programmed to be 2048 bytes.
C64 acLogicalHdlcRxFCSError	1.3.6.1.4.1.2785.2.4.4.1.1.8	Counter64	read-only	The total number of receive FCS errors that occurred in the hdlc controller for this specified channel number. The FCS error is generated when the FCS from HDLC packet receieved differs from the FCS that is computed by the HDLC controller.
C64 acLogicalHdlcRxNonOctetAligned	1.3.6.1.4.1.2785.2.4.4.1.1.9	Counter64	read-only	The total number of receive non-octet aligned errors that occurred in the hdlc controller for this specified channel number. This error occurs when the receieved data stream is not octet aligned.
C64 acLogicalHdlcRxHdlcPktAbort	1.3.6.1.4.1.2785.2.4.4.1.1.10	Counter64	read-only	The total number of receive hdlc abort errors that occurred in the hdlc controller for this specified channel number. This error occurs when and abort code (at least 7 contiguous 1's) is received.
C64 acLogicalHdlcRxBufferStarvation	1.3.6.1.4.1.2785.2.4.4.1.1.11	Counter64	read-only	The total number of receive buffer starvation errors that occurred in the hdlc controller for this specified channel number.
C64 acLogicalHdlcTxFifoUnderrun	1.3.6.1.4.1.2785.2.4.4.1.1.12	Counter64	read-only	The total number of transmit FIFO underrun errors that occurred in the hdlc controller for this specified channel number. This error occurs when attempts are made to read data from a channel that does not have any data ready to send.
C64 acLogicalHdlcRxBundleDiscardDupSeq	1.3.6.1.4.1.2785.2.4.4.1.1.13	Counter64	read-only	The total number of receive bundle discard duplicate sequence errors that occurred in the hdlc controller for this specified channel number.
C64 acLogicalHdlcRxBundleDiscardMissSeq	1.3.6.1.4.1.2785.2.4.4.1.1.14	Counter64	read-only	The total number of receive bundle discard missed sequence errors that occurred in the hdlc controller for this specified channel number.
C64 acLogicalHdlcRxBundleDiscardQDepth	1.3.6.1.4.1.2785.2.4.4.1.1.15	Counter64	read-only	The total number of receive bundle discard queue depth errors that occurred in the hdlc controller for this specified channel number.
C64 acLogicalHdlcIngressRxFrames	1.3.6.1.4.1.2785.2.4.4.1.1.16	Counter64	read-only	The total number of ingress receive frames that the MLC has received from the hdlc controller for this specified channel number.
C64 acLogicalHdlcEgressTxFrames	1.3.6.1.4.1.2785.2.4.4.1.1.17	Counter64	read-only	The total number of egress transmit frames that the MLC has transmitted to the hdlc controller for this specified channel number.

RFC description

Manages HDLC configuration and statistics for logical ports on Appian optical services platforms.

Start monitoring Appian Communications OSAP SONET/optical access platform (legacy) 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 APPIAN-LPORT-HDLC-MIB