TN-LOOP-PROTECT-MIB

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Organization: Transition Networks, Inc.

Last Updated: 2012-07-25

Category: Transition Networks Media Converters

Description: Manages Transition Networks loop protection detection policy and port shutdown action.

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What Is TN-LOOP-PROTECT-MIB?

TN-LOOP-PROTECT-MIB is a Transition Networks proprietary MIB implementing Loop Protection, a feature that detects and automatically disables a port forming an accidental Layer 2 loop. Its base table sets a global enable flag, transmit interval, and shutdown time, while a per-port table records enable, action (shut down vs. alert only), transmit-mode enable, loop-detection count, status, loop-detected flag, and last-loop time, alongside a loop-detected notification. As a configuration/protocol-status MIB it lets an administrator confirm which port triggered a loop-protection shutdown and when. It is deployed on Transition Networks managed switches with Loop Protection. Engineers can download the TN-LOOP-PROTECT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in TN-LOOP-PROTECT-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

Transition Networks managed switches (Loop Protection)

Monitoring Examples

An administrator subscribes to tnLoopProtectLoopDetectedNotification to get alerted immediately when a port is automatically shut down due to a detected Layer 2 loop on a Transition Networks switch.

What Can Be Monitored

per-port loop detection and shutdown status

Imported Objects

From ENTITY-MIB

entPhysicalIndex

OBJECT-TYPE

From IF-MIB

ifIndex

OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

DateAndTime
DisplayString
TimeStamp
TruthValue

From TRANSITION-SMI

tnProducts

OBJECT-IDENTITY

How to Use in IPNetwork Monitor

Example using tnLoopProtectPortLoopCount OID:

Select a Transition Networks managed switch (Loop Protection detection/shutdown status) 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 tnLoopProtectPortLoopCount 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 loops detected on this port. 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
tnLoopProtectMIB	1.3.6.1.4.1.868.2.5.22			The mib module for managing all transition products with Loop protection
tnLoopProtectNotifications	1.3.6.1.4.1.868.2.5.22.0
NTF tnLoopProtectLoopDetectedNotification	1.3.6.1.4.1.868.2.5.22.0.1			A tnLoopProtectLoopDetectedNotification signifies that a loop has been detected by the loop protection protocol. Additional infomation contains port number ,count of loop detected on the port and the action will be execute
tnLoopProtectObjects	1.3.6.1.4.1.868.2.5.22.1
tnLoopProtectMgmt	1.3.6.1.4.1.868.2.5.22.1.1
tnLoopProtectBaseTable	1.3.6.1.4.1.868.2.5.22.1.1.1		not-accessible	This table is used for configuring global loop protect variables
tnLoopProtectBaseEntry	1.3.6.1.4.1.868.2.5.22.1.1.1.1		not-accessible	This entry contains configuration elements of tnLoopProtectBaseTable
T/F tnLoopProtectEnable	1.3.6.1.4.1.868.2.5.22.1.1.1.1.1	TruthValue	read-write	Indicates whether the loop protect is enable on this device.
INT tnLoopProtectTxTime	1.3.6.1.4.1.868.2.5.22.1.1.1.1.2	INTEGER	read-write	The interval in seconds between each loop protection PDU sent on each port. valid values are 1 to 10 seconds,the default value is 5 seconds.
INT tnLoopProtectShutdownTime	1.3.6.1.4.1.868.2.5.22.1.1.1.1.3	INTEGER	read-write	The period (in seconds) for which a port will be kept disabled in the event of a loop is detected (and the port action shuts down the port). Valid values are 0 to 604800 seconds (7 days). A value of zero will keep a port disabled (until next device restart).
tnLoopProtectPortTable	1.3.6.1.4.1.868.2.5.22.1.1.2		not-accessible	This table is used for configuring loop protect options for each port
tnLoopProtectPortEntry	1.3.6.1.4.1.868.2.5.22.1.1.2.1		not-accessible	This entry contains configuration element of tnLoopProtectBaseTable
T/F tnLoopProtectPortEnable	1.3.6.1.4.1.868.2.5.22.1.1.2.1.1	TruthValue	read-write	Controls whether loop protection is enabled on this switch port.
INT tnLoopProtectPortAction	1.3.6.1.4.1.868.2.5.22.1.1.2.1.2	INTEGER	read-write	Configures the action performed when a loop is detected on a port. Valid values are Shutdown Port(1), Shutdown Port and Log(2) or Log Only(3).
T/F tnLoopProtectPortTxModeEnable	1.3.6.1.4.1.868.2.5.22.1.1.2.1.3	TruthValue	read-write	Controls whether the port is actively generating loop protection PDU's, or whether it is just passively looking for looped PDU's.
C32 tnLoopProtectPortLoopCountEx	1.3.6.1.4.1.868.2.5.22.1.1.2.1.4	Counter32	read-only	The number of loops detected on this port.
INT tnLoopProtectPortStatus	1.3.6.1.4.1.868.2.5.22.1.1.2.1.5	INTEGER	read-only	The status of the port. up(1): the status of the port is up. down(2):the status of the port is down. disable(3):loop is detected in this port and shutdown is triggered at the same time
T/F tnLoopProtectPortLoopDetected	1.3.6.1.4.1.868.2.5.22.1.1.2.1.6	TruthValue	read-only	Indicates Whether a loop is currently detected on the port.
DAT tnLoopProtectPortLastLoopTime	1.3.6.1.4.1.868.2.5.22.1.1.2.1.7	DateAndTime	read-only	The time of the last loop event detected.

RFC description

Monitors and manages loop protection features in Transition Networks switches, detecting and preventing network loops with configurable per-port actions.

Start monitoring Transition Networks managed switches (Loop Protection detection/shutdown status) 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 TN-LOOP-PROTECT-MIB