CISCO-QLLC01-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 1994-11-09

Category: Cisco Devices, SNA and Legacy Protocols

Description: Manages Qualified Logical Link Control (QLLC) SNA-over-X.25 protocol sessions on Cisco legacy WAN platforms.

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What Is CISCO-QLLC01-MIB?

CISCO-QLLC01-MIB manages Qualified Logical Link Control (QLLC), a legacy protocol used to carry SNA traffic over X.25 networks, and it belongs to Cisco's older WAN/SNA internetworking MIB family. It exposes configuration data for logical link stations (the administrative circuit type, role, X.25 address, and modulo settings) as well as operational state tables describing active QLLC sessions per interface. Its monitoring value is centered on software/protocol status rather than physical hardware: an operator uses it to check whether a configured QLLC logical link station is administratively set up correctly and whether the corresponding operational entry is up and passing SNA traffic over the X.25 circuit. It builds on the standard ifIndex convention from IF-MIB to tie QLLC link stations to underlying serial/X.25 interfaces. This MIB is typically deployed in legacy SNA-over-X.25 gateway routers bridging mainframe traffic across packet-switched WANs, a use case now largely obsolete. Engineers can download the CISCO-QLLC01-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-QLLC01-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

Cisco WAN routers (legacy SNA/X.25 gateways)

Monitoring Examples

An administrator would cross-reference qllcLSAdminTable/qllcLSAdminEntry, reading qllcLSAdminIfIndex, qllcLSAdminLciVcIndex, and qllcLSAdminX25Add to confirm a logical link station is configured with the correct X.25 address and circuit type, then check qllcLSOperTable/qllcLSOperEntry (keyed by qllcLSOperIfIndex) to see if that link station is actually operational. A mismatch, for example an admin entry present but no corresponding operational entry, would indicate the QLLC session failed to establish over the X.25 virtual circuit.

What Can Be Monitored

QLLC logical link station admin configuration
circuit type and role per link station
X.25 address and modulo settings
operational status of QLLC sessions per interface
logical channel/virtual circuit index

Imported Objects

From CISCO-SMI

ciscoExperiment

OBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using qllcLSStatsXidIn OID:

Select a Cisco WAN router (legacy SNA/X.25 gateways) 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 qllcLSStatsXidIn 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 XIDs received from the LS on this VC. 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
snaqllc01	1.3.6.1.4.1.9.10.6			This is the MIB module for objects used to manage the QLLC protocol.
qllc	1.3.6.1.4.1.9.10.6.1
qllcLSAdminTable	1.3.6.1.4.1.9.10.6.1.1		not-accessible	This table contains objects that can be changed for each qllc entry. Changing one of these parameters will take effect in the operating LS immediately. Each qllc connection will have an entry in this table.
qllcLSAdminEntry	1.3.6.1.4.1.9.10.6.1.1.1		not-accessible	Configured parameter values for a specific qllc.
IFI qllcLSAdminIfIndex	1.3.6.1.4.1.9.10.6.1.1.1.1	IfIndexType	read-write	Interface Index value for the qllc connection.
IFI qllcLSAdminLciVcIndex	1.3.6.1.4.1.9.10.6.1.1.1.2	IfIndexType	read-write	The virtual circuit number for the logical channel identifier or PVC number depending on the type of circuit on this interface.
INT qllcLSAdminCircuitType	1.3.6.1.4.1.9.10.6.1.1.1.3	INTEGER	read-write	The circuit type on this interface.
INT qllcLSAdminRole	1.3.6.1.4.1.9.10.6.1.1.1.4	INTEGER	read-write	The role that the QLLC link station shall assume.
ADR qllcLSAdminX25Add	1.3.6.1.4.1.9.10.6.1.1.1.5	X121Address	read-write	The X.25 address associated with the qllc connection.
INT qllcLSAdminModulo	1.3.6.1.4.1.9.10.6.1.1.1.6	INTEGER	read-write	The modulus for QLLC link station. It determines the size of the rotating ACK window and can take values of 8 and 128.
I32 qllcLSAdminLgX25	1.3.6.1.4.1.9.10.6.1.1.1.7	Integer32	read-write	The largest QLLC packet allowed to go out on the QLLC/X.25 side.
qllcLSOperTable	1.3.6.1.4.1.9.10.6.1.2		not-accessible	This table contains an entry for each qllc connection.
qllcLSOperEntry	1.3.6.1.4.1.9.10.6.1.2.1		not-accessible	Parameter values for a specific qllc connection.
IFI qllcLSOperIfIndex	1.3.6.1.4.1.9.10.6.1.2.1.1	IfIndexType	read-only	Interface Index value for the qllc connection.
IFI qllcLSOperLciVcIndex	1.3.6.1.4.1.9.10.6.1.2.1.2	IfIndexType	read-only	The virtual circuit number for the logical channel identifier on this interface.
INT qllcLSOperCircuitType	1.3.6.1.4.1.9.10.6.1.2.1.3	INTEGER	read-only	The circuit type on this interface.
INT qllcLSOperRole	1.3.6.1.4.1.9.10.6.1.2.1.4	INTEGER	read-only	The role the QLLC link station.
ADR qllcLSOperX25Add	1.3.6.1.4.1.9.10.6.1.2.1.5	X121Address	read-only	The remote X.25 address associated with the qllc connection.
INT qllcLSOperModulo	1.3.6.1.4.1.9.10.6.1.2.1.6	INTEGER	read-only	The modulus for QLLC link station. It determines the size of the rotating ACK window and can take values of 8 and 128.
INT qllcLSOperState	1.3.6.1.4.1.9.10.6.1.2.1.7	INTEGER	read-only	The state of a particular QLLC connection. Inop, closed, opening, closing, recovery and opened are states defined in the IBM document SC30-3409-1 The X.25 1984/1988 DTE/DCE and DTE/DTE Interface Architecture Reference.
I32 qllcLSOperLgX25	1.3.6.1.4.1.9.10.6.1.2.1.8	Integer32	read-only	The largest QLLC packet allowed to go out on the QLLC/X.25 side.
qllcLSStatsTable	1.3.6.1.4.1.9.10.6.1.3		not-accessible	This table defines link station statistics kept for each qllc connection.
qllcLSStatsEntry	1.3.6.1.4.1.9.10.6.1.3.1		not-accessible	Link station statistics.
IFI qllcLSStatsIfIndex	1.3.6.1.4.1.9.10.6.1.3.1.1	IfIndexType	read-only	Interface Index value for the qllc connection.
IFI qllcLSStatsLciVcIndex	1.3.6.1.4.1.9.10.6.1.3.1.2	IfIndexType	read-only	The virtual circuit number for the logical channel identifier on this interface.
C32 qllcLSStatsXidInEx	1.3.6.1.4.1.9.10.6.1.3.1.3	Counter32	read-only	The number of XIDs received from the LS on this VC.
C32 qllcLSStatsXidOut	1.3.6.1.4.1.9.10.6.1.3.1.4	Counter32	read-only	The number of XIDs sent to the LS on this VC.
C32 qllcLSStatsTestIn	1.3.6.1.4.1.9.10.6.1.3.1.5	Counter32	read-only	The number of TEST packets received from the LS on this VC.
C32 qllcLSStatsTestOut	1.3.6.1.4.1.9.10.6.1.3.1.6	Counter32	read-only	The number of TEST packets sent to the LS from this VC.
C32 qllcLSStatsQuenchOff	1.3.6.1.4.1.9.10.6.1.3.1.7	Counter32	read-only	The number of times the connection Quenched off for this connection.
C32 qllcLSStatsQuenchOn	1.3.6.1.4.1.9.10.6.1.3.1.8	Counter32	read-only	The number of times the connection Quenched on for this connection.
C32 qllcLSStatsInPaks	1.3.6.1.4.1.9.10.6.1.3.1.9	Counter32	read-only	The total number of information packets received on this interfaces.
C32 qllcLSStatsOutPaks	1.3.6.1.4.1.9.10.6.1.3.1.10	Counter32	read-only	The total number of information packets sent on this interfaces.
C32 qllcLSStatsInBytes	1.3.6.1.4.1.9.10.6.1.3.1.11	Counter32	read-only	The total number of bytes in the information packets received on this connection.
C32 qllcLSStatsOutBytes	1.3.6.1.4.1.9.10.6.1.3.1.12	Counter32	read-only	The total number of bytes in the information packets sent on this connection.
C32 qllcLSStatsNumRcvQsms	1.3.6.1.4.1.9.10.6.1.3.1.13	Counter32	read-only	The number of QSMs received on this connection.
C32 qllcLSStatsNumSndQsms	1.3.6.1.4.1.9.10.6.1.3.1.14	Counter32	read-only	The number of QSMs sent on this connection.
C32 qllcLSStatsNumRcvDiscs	1.3.6.1.4.1.9.10.6.1.3.1.15	Counter32	read-only	The number of DISCs received on this connection.
C32 qllcLSStatsNumSndDiscs	1.3.6.1.4.1.9.10.6.1.3.1.16	Counter32	read-only	The number of DISCs sent on this connection.
C32 qllcLSStatsNumRcvDms	1.3.6.1.4.1.9.10.6.1.3.1.17	Counter32	read-only	The number of DMs received on this connection.
C32 qllcLSStatsNumSndDms	1.3.6.1.4.1.9.10.6.1.3.1.18	Counter32	read-only	The number of DMs sent on this connection.
C32 qllcLSStatsNumRcvFrmrs	1.3.6.1.4.1.9.10.6.1.3.1.19	Counter32	read-only	The number of FRMRs received on this connection.
C32 qllcLSStatsNumSndFrmrs	1.3.6.1.4.1.9.10.6.1.3.1.20	Counter32	read-only	The number of FRMRs sent on this connection.
C32 qllcLSStatsNumDrops	1.3.6.1.4.1.9.10.6.1.3.1.21	Counter32	read-only	The number of packets dropped due to buffer allocation or other internal problems.
C32 qllcLSStatsNumErrs	1.3.6.1.4.1.9.10.6.1.3.1.22	Counter32	read-only	The number of HDLC protocol errors detected.
qllcMibConformance	1.3.6.1.4.1.9.10.6.2
qllcMibCompliances	1.3.6.1.4.1.9.10.6.2.1
qllcMibCompliance	1.3.6.1.4.1.9.10.6.2.1.1			The compliance statement for QLLC nodes.
qllcMibGroups	1.3.6.1.4.1.9.10.6.2.2
qllcLSAdminGroup	1.3.6.1.4.1.9.10.6.2.2.1			A collection of objects providing configuration capability.
qllcLSOperGroup	1.3.6.1.4.1.9.10.6.2.2.2			A collection of objects providing operational control capability.
qllcLSStatsGroup	1.3.6.1.4.1.9.10.6.2.2.3			A collection of objects providing statistics.

RFC description

Manages QLLC (Qualified Logical Link Control) protocol configuration and operation for SNA network connectivity.

Start monitoring Cisco WAN routers (legacy SNA/X.25 gateways) 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 CISCO-QLLC01-MIB