Fore-HDLC-MIB

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Category: ATM, Vendor: Fore Systems (ATM)

Description: Fore Systems HDLC interface MIB providing configuration and statistics for HDLC data link layer connections on ForeRunner ATM switch modules.

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What Is Fore-HDLC-MIB?

Fore-HDLC-MIB is a Fore Systems proprietary MIB covering HDLC (High-Level Data Link Control) data-link interfaces available as port modules on ForeRunner ATM switches. It defines an interface configuration table (payload type, admin status, frame check sequence width) plus a parallel statistics table of transmitted/received packets and octets per HDLC interface. This makes it useful for monitoring both the software/configuration status of an HDLC link (whether it is administratively up and correctly framed) and its ongoing performance/traffic load, functioning much like a specialized companion to standard IF-MIB counters for this link type. It has an implicit dependency on general Interfaces MIB conventions since HDLC interfaces are numbered and typed similarly to other ifTable entries. Typical deployment is on ForeRunner switches used as WAN edge devices carrying leased-line or serial HDLC circuits into an ATM core, and administrators can download the Fore-HDLC-MIB file directly to load it into their MIB browser.

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

Fore Systems ForeRunner ATM switch (HDLC port module)

Monitoring Examples

An operator would check foreHdlcIfAdminStatus and foreHdlcIfPayloadType in foreHdlcIfTable to confirm a serial HDLC circuit is enabled and framed as expected, then poll foreHdlcIfTxPackets/foreHdlcIfRxPackets and foreHdlcIfTxOctets/foreHdlcIfRxOctets from foreHdlcStatsTable to trend throughput. A sudden drop in RxPackets while TxPackets continues normally would point to an upstream carrier or cabling fault on that HDLC link. foreHdlcIfFcsWidth would be checked when troubleshooting framing/CRC errors between mismatched endpoints.

What Can Be Monitored

HDLC interface admin status
HDLC payload/framing type
frame check sequence width
transmitted packets/octets
received packets/octets

Imported Objects

From Fore-Common-MIB

asx	OBJECT-IDENTITY

From Fore-TrapLog-MIB

trapLogIndex

OBJECT-TYPE

From IF-MIB

ifIndex	OBJECT-TYPE
ifName	OBJECT-TYPE

From SNMPv2-SMI

Counter32
NOTIFICATION-TYPE
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using foreHdlcIfTxPackets OID:

Select a Fore Systems (later Marconi) ForeRunner ATM switch (HDLC port module) 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 foreHdlcIfTxPackets 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 packets that have arrived at the HDLC SAP from the upper layer. 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 sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
foreHdlcIfGroup	1.3.6.1.4.1.326.2.2.1.1.20
NTF foreHdlcLOFDetected	1.3.6.1.4.1.326.2.2.1.1.20.0.1			This trap indicates that the specified HDLC interface is experiencing Loss Of Frame (LOF) failure. An LOF failure is declared when the LOF defect persists fore a period of 2.5 +/- 0.5 seconds.
NTF foreHdlcLOFCleared	1.3.6.1.4.1.326.2.2.1.1.20.0.2			This trap indicates that the LOF failure identified by trap foreHdlcLOFDetected has been cleared. The LOF failure is cleared when the LOF defect is absent for 10 +/- 0.5 seconds.
foreHdlcIfTable	1.3.6.1.4.1.326.2.2.1.1.20.1		not-accessible	A table containing HDLC interface configuration and status.
foreHdlcIfEntry	1.3.6.1.4.1.326.2.2.1.1.20.1.1		not-accessible	A table entry containing the HDLC interface information.
INT foreHdlcIfPayloadType	1.3.6.1.4.1.326.2.2.1.1.20.1.1.1	INTEGER	read-write	Indicates the configured mode for this interface.
INT foreHdlcIfAdminStatus	1.3.6.1.4.1.326.2.2.1.1.20.1.1.2	INTEGER	read-write	Indicates the admin status of this interface.
INT foreHdlcIfFcsWidth	1.3.6.1.4.1.326.2.2.1.1.20.1.1.3	INTEGER	read-write	Indicates the configured width of the FCS on this interface.
foreHdlcStatsTable	1.3.6.1.4.1.326.2.2.1.1.20.2		not-accessible	A table containing HDLC interface Statistics
foreHdlcStatsEntry	1.3.6.1.4.1.326.2.2.1.1.20.2.1		not-accessible	A table entry containing the HDLC statistics.
C32 foreHdlcIfTxPacketsEx	1.3.6.1.4.1.326.2.2.1.1.20.2.1.1	Counter32	read-only	The number of packets that have arrived at the HDLC SAP from the upper layer.
C32 foreHdlcIfTxOctets	1.3.6.1.4.1.326.2.2.1.1.20.2.1.2	Counter32	read-only	The number of octets that the HDLC packet layer has passed to the lower layer.
C32 foreHdlcIfRxPackets	1.3.6.1.4.1.326.2.2.1.1.20.2.1.3	Counter32	read-only	The number of packets that the HDLC SAP has passed to the upper layear.
C32 foreHdlcIfRxOctets	1.3.6.1.4.1.326.2.2.1.1.20.2.1.4	Counter32	read-only	The number of octets that the HDLC packet layer has received from the lower layer.
C32 foreHdlcIfChecksumErrors	1.3.6.1.4.1.326.2.2.1.1.20.2.1.5	Counter32	read-only	The number of packets that the HDLC packet layer has discarded due to checksum errors.
INT foreHdlcIfLossOfFrame	1.3.6.1.4.1.326.2.2.1.1.20.2.1.6	INTEGER	read-only	Indicates whether or not loss of frame is being experienced in the incoming octet stream.

RFC description

Manages HDLC interface configuration and status on Fore Systems ATM switches.

Start monitoring Fore Systems (later Marconi) ForeRunner ATM switch (HDLC port module) 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 Fore-HDLC-MIB