NBS-USER-SESSION-MIB

All MIBs › NBS-USER-SESSION-MIB

Organization: MRV

Last Updated: 2011-10-12

Category: Network Management

Description: Tracks active user management sessions including login events and session state on MRV NBS devices.

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What Is NBS-USER-SESSION-MIB?

NBS-USER-SESSION-MIB is a vendor MIB from MRV Communications for tracking active user management sessions on NBS-series network devices, such as console or terminal-server style access to the equipment's management interface. It exposes a session table recording each active session's process ID, type, line, session ID, associated username, connecting host, and connect time, along with a row-status object to control session entries. This is a management-plane/software-status MIB rather than a hardware-health MIB: administrators use it to see who is currently logged into a device's CLI or management session, from where, and since when, useful for security auditing and for forcibly clearing a stuck or unauthorized session. It shares the "nbs" indexing conventions with other MRV NBS-series MIBs used on the same physical platform. It is deployed on MRV networking/optical equipment wherever administrators need visibility into concurrent management sessions for security and operational auditing, typically after loading the module into a NBS-USER-SESSION-MIB MIB Browser to review its object definitions.

IPNetwork Monitor allows you to monitor SNMP objects defined in NBS-USER-SESSION-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

MRV networking/optical equipment

Monitoring Examples

An administrator polls nbsUserSessionTable to list every active session's nbsUserSessionUser, nbsUserSessionHost, and nbsUserSessionConnectTime, confirming only authorized staff are logged into the device's management interface. If an unfamiliar nbsUserSessionHost shows a long-lived nbsUserSessionConnectTime, the admin can set nbsUserSessionRowStatus to terminate that session. The nbsUserSessionType and nbsUserSessionLine fields distinguish between console, Telnet, or SSH sessions when auditing access methods.

What Can Be Monitored

active management session user/host
session connect time
session type and line
session process ID

Imported Objects

From NBS-CMMC-MIB

nbs	OBJECT-IDENTITY

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

DisplayString
RowStatus

How to Use in IPNetwork Monitor

Example using nbsUserSessionTableSize OID:

Select an MRV networking/optical equipment (active management session tracking) 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 nbsUserSessionTableSize into the Find box to locate it in the OID tree, then select it and click OK. The number of rows in the nbsUserSession table. 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 an INTEGER-type OID, Value bounds is the most useful condition here — trigger an alert if the count changes from its expected baseline, since that would indicate the underlying set of items changed unexpectedly. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
nbsUserSessionMib	1.3.6.1.4.1.629.218			MIB for representing MRV User Session information
nbsUserSessionGrp	1.3.6.1.4.1.629.218.1			User Session MIB
INT nbsUserSessionTableSizeEx	1.3.6.1.4.1.629.218.1.1	INTEGER	read-only	The number of rows in the nbsUserSession table
nbsUserSessionTable	1.3.6.1.4.1.629.218.1.2		not-accessible	A table describing the user sessions
nbsUserSessionEntry	1.3.6.1.4.1.629.218.1.2.1		not-accessible	Contains the information describing a UI Session
U32 nbsUserSessionPID	1.3.6.1.4.1.629.218.1.2.1.1	Unsigned32	not-accessible	The process id of the task servicing this session.
ROW nbsUserSessionRowStatus	1.3.6.1.4.1.629.218.1.2.1.2	RowStatus	read-write	This table's RowStatus object to delete the rows.
INT nbsUserSessionType	1.3.6.1.4.1.629.218.1.2.1.3	INTEGER	read-only	This object follows the ut_type entry in struct utmp.
STR nbsUserSessionLine	1.3.6.1.4.1.629.218.1.2.1.4	DisplayString	read-only	Device name of the tty being used by this session.
STR nbsUserSessionId	1.3.6.1.4.1.629.218.1.2.1.5	DisplayString	read-only	This object follows the ut_type entry in struct utmp.
STR nbsUserSessionUser	1.3.6.1.4.1.629.218.1.2.1.6	DisplayString	read-only	The name of the user using this session.
STR nbsUserSessionHost	1.3.6.1.4.1.629.218.1.2.1.7	DisplayString	read-only	Hostname of the remote IP from which the user is originating.
U32 nbsUserSessionConnectTime	1.3.6.1.4.1.629.218.1.2.1.8	Unsigned32	read-only	This object indicates the time the entry was created.
INT nbsUserSessionVia	1.3.6.1.4.1.629.218.1.2.1.9	INTEGER	read-only	This object indicates the type of session. Note that this field is decided by the system, and is not stored in the utmp file.

RFC description

User session information for MRV management systems including connection details and session types.

Start monitoring MRV networking/optical equipment (active management session tracking) 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.

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