ENTERASYS-LINK-FLAP-MIB

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Organization: Enterasys Networks, Inc

Last Updated: 2009-10-16

Category: Vendor: Enterasys/Cabletron

Description: Enterasys Networks MIB for detecting and automatically limiting the impact of frequent link state transitions on switch ports.

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What Is ENTERASYS-LINK-FLAP-MIB?

ENTERASYS-LINK-FLAP-MIB is an Enterasys Networks, Inc. proprietary MIB implementing Link Flap Detection, which automatically limits the effect of frequent link state transitions (flapping) on a port. Its objects cover system state, supported actions, and max-flap setting, and a per-interface table (enabled status, action, operational status, clear-stats action, count threshold, time interval, down time, current/total linkdown counts, current-elapsed time, flap-violation count) with a link-flap-violation notification. As a configuration/notification MIB it lets an administrator confirm flap-detection thresholds and get alerted when a port is disabled due to excessive flapping on an Enterasys switch. It is deployed on Enterasys Networks managed switches. Engineers can download the ENTERASYS-LINK-FLAP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in ENTERASYS-LINK-FLAP-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

Enterasys Networks managed switches

Monitoring Examples

An administrator receives an etsysLinkFlapViolation notification and checks etsysLinkFlapIntfLinkdownCountTotal to confirm a port was disabled due to excessive link flapping on an Enterasys switch.

What Can Be Monitored

link-flap detection thresholds and violation notifications

Imported Objects

From ENTERASYS-MIB-NAMES

etsysModules

OBJECT-IDENTITY

From IF-MIB

ifIndex	OBJECT-TYPE
ifName	OBJECT-TYPE

From P-BRIDGE-MIB

EnabledStatus

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Gauge32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TEXTUAL-CONVENTION
TruthValue

How to Use in IPNetwork Monitor

Example using etsysLinkFlapIntfLinkdownCountCurrent OID:

Select an Enterasys Networks switch (legacy, later Extreme Networks) (Link Flap Detection) 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 etsysLinkFlapIntfLinkdownCountCurrent 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 current number of link state transitions accrued during the current monitor interval. 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 Gauge32-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 (in link state transitions), 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
etsysLinkFlapMIB	1.3.6.1.4.1.5624.1.2.52			This is the MIB module for Enterasys Link Flap Detection, a mechanism to automatically limit the effect of frequent link state transitions on Enterasys devices.
etsysLinkFlapObjects	1.3.6.1.4.1.5624.1.2.52.1
etsysLinkFlapNotificationBranch	1.3.6.1.4.1.5624.1.2.52.1.0
NTF etsysLinkFlapViolation	1.3.6.1.4.1.5624.1.2.52.1.0.1			If the Link Flap feature is globally enabled and specifically enabled for this interface, then this trap is sent when a link state transition is detected which accrues to a sum of transitions exceeding the value etsysLinkFlapIntfCountThreshold over the time period etsysLinkFlapIntfTimeInterval.
etsysLinkFlapSystemBranch	1.3.6.1.4.1.5624.1.2.52.1.1
ENA etsysLinkFlapSystemState	1.3.6.1.4.1.5624.1.2.52.1.1.1	EnabledStatus	read-write	The current state of the active part of the Link Flap feature. enabled (1) - All supported aspects of Link Flap are operational. disabled (2) - Link Flap is configurable but no actions are taken. All statistical information is still gathered and available. When this object is set to disabled the Link Flap feature MUST release its control on all interfaces. Any interfaces which the Link Flap feature had operationally held in the 'down' state MUST be allowed to attain their currently correct operational state. Maintaining the value of this object across agent reboots is REQUIRED.
NUM etsysLinkFlapSystemSupportedActions	1.3.6.1.4.1.5624.1.2.52.1.1.2	LinkFlapIntfAction	read-only	The supported actions that the Link Flap feature can take when link flap activity exceeds the associated threshold on this interface. disableInterface(0) - Capability to set the interface operational status to 'down'. generateSyslogEntry(1) - Capability to create syslog messages. generateNotification(2) - Capability to generate SNMP notifications. Please see the LinkFlapIntfAction textual convention defined in this MIB.
U32 etsysLinkFlapSystemLinkFlapMaximum	1.3.6.1.4.1.5624.1.2.52.1.1.3	Unsigned32	read-only	The greatest number of linkdown events which can occur per ten second interval. This is an implementation-specific parameter which will determine the allowable values of etsysLinkFlapIntfCountThreshold and etsysLinkFlapIntfTimeInterval. Setting either one of these such that the ratio of etsysLinkFlapIntfCountThreshold to etsysLinkFlapIntfTimeInterval would become greater than etsysLinkFlapSystemLinkFlapMaximum will result in the set operation failing with an inconsistentValue error.
etsysLinkFlapInterfaceBranch	1.3.6.1.4.1.5624.1.2.52.1.2
etsysLinkFlapInterfaceTable	1.3.6.1.4.1.5624.1.2.52.1.2.1		not-accessible	A table that provides for the configuration, status, and statistics related to, the Link Flap feature on a per interface basis.
etsysLinkFlapInterfaceEntry	1.3.6.1.4.1.5624.1.2.52.1.2.1.1		not-accessible	The configuration, status, and statistics related to, the Link Flap feature for an individual interface.
INT etsysLinkFlapIntfEnabledStatus	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.1	INTEGER	read-write	The enable state of Link Flap on this interface. Transitioning from enabled(1) to disabled(2) will disable the active part of the Link Flap feature as defined for the etsysLinkFlapSystemState object on this interface. In this event the agent MUST: 1) Release its control on this interface. If the interface had been operationally held in the 'down' state, then the interface MUST be allowed to attain its currently correct operational state. 2) etsysLinkFlapIntfOperStatus MUST be set to operational(1). 3) The objects etsysLinkFlapIntfLinkdownCountCurrent etsysLinkFlapIntfLinkdownCountTotal etsysLinkFlapIntfCurrentElapsed MUST continue to accrue value as events occur. In transitioning from disabled(2) to enabled(1) the objects: etsysLinkFlapIntfLinkdownCountCurrent etsysLinkFlapIntfCurrentElapsed MUST be initialized at 0 (zero) for this interface. Maintaining the value of this object across agent reboots is REQUIRED.
NUM etsysLinkFlapIntfAction	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.2	LinkFlapIntfAction	read-write	The configured actions that the Link Flap feature can take when link flap activity exceeds the associated threshold on this interface. disableInterface(0) - Interface operational status set to 'down'. generateSyslogEntry(1) - Descriptive syslog message generated generateNotification(2) - SNMP notification generated. Maintaining the value of this object across agent reboots is REQUIRED.
INT etsysLinkFlapIntfOperStatus	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.3	INTEGER	read-write	The current status of the interface with respect to Link Flap detection. A read of operational(1) indicates that the Link Flap feature has not taken any action to operationally limit this interface. A read of disabled(2) indicates that the Link Flap feature has taken action to operationally disable this interface due to excessive link state transitions. Setting this object to operational(1) when it is disabled(2) will cause Link Flap to release its control which is keeping this interface operationally disabled. Any other write of this object will have no effect. Maintaining the value of this object across agent reboots is NOT RECOMMENDED.
T/F etsysLinkFlapIntfClearStats	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.4	TruthValue	read-write	When set to true(1) the following objects: etsysLinkFlapIntfLinkdownCountCurrent etsysLinkFlapIntfLinkdownCountTotal etsysLinkFlapIntfLinkFlapViolations in this row of the etsysLinkFlapInterfaceTable MUST be set to 0 (zero). Setting this object to false(2) will have no effect. When read this object will always return false(2). Maintaining the value of this object across agent reboots is NOT RECOMMENDED.
U32 etsysLinkFlapIntfCountThreshold	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.5	Unsigned32	read-write	The threshold count of link state transitions, which if exceeded within time limit etsysLinkFlapIntfTimeInterval, necessitates actions specified in LinkFlapIntfAction. Setting etsysLinkFlapIntfCountThreshold such that the ratio of etsysLinkFlapIntfCountThreshold to etsysLinkFlapIntfTimeInterval would become greater than etsysLinkFlapSystemLinkFlapMaximum will result in the set operation failing with an inconsistentValue error. Maintaining the value of this object across agent reboots is REQUIRED
U32 etsysLinkFlapIntfTimeInterval	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.6	Unsigned32	read-write	The time period during which link state transitions accrue toward the threshold count etsysLinkFlapIntfCountThreshold. Setting etsysLinkFlapIntfTimeInterval such that the ratio of etsysLinkFlapIntfCountThreshold to etsysLinkFlapIntfTimeInterval would become greater than etsysLinkFlapSystemLinkFlapMaximum will result in the set operation failing with an inconsistentValue error. Note that one special value, 0 (zero) of the etsysLinkFlapIntfTimeInterval is used to specify that etsysLinkFlapIntfTimeInterval is unbounded. Maintaining the value of this object across agent reboots is REQUIRED
U32 etsysLinkFlapIntfDownTime	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.7	Unsigned32	read-write	The time period during which the violating interface operational status may be held to 'down' by the LinkFlap functionality. Note that one special value, 0 (zero) of the etsysLinkFlapIntfDownTime is used to specify that etsysLinkFlapIntfDownTime is unbounded. Maintaining the value of this object across agent reboots is REQUIRED
G32 etsysLinkFlapIntfLinkdownCountCurrentEx	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.8	Gauge32	read-only	The current number of link state transitions accrued during the current monitor interval. This information is always available and current. Maintaining the value of this object across agent reboots is NOT RECOMMENDED.
G32 etsysLinkFlapIntfLinkdownCountTotal	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.9	Gauge32	read-only	The total number of link state transitions accrued on this interface. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime. This information is always available and current. Maintaining the value of this object across agent reboots is NOT RECOMMENDED.
U32 etsysLinkFlapIntfCurrentElapsed	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.10	Unsigned32	read-only	The current number of completed system ticks accrued on this interface during the current monitor interval. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime. This information is always available and current. Maintaining the value of this object across agent reboots is NOT RECOMMENDED.
G32 etsysLinkFlapIntfLinkFlapViolations	1.3.6.1.4.1.5624.1.2.52.1.2.1.1.11	Gauge32	read-only	The total number of link flap violations accrued on this interface. Discontinuities in the value of this counter can occur at re-initialization of the management system, and at other times as indicated by the value of ifCounterDiscontinuityTime. This information is always available and current. Maintaining the value of this object across agent reboots is NOT RECOMMENDED.
etsysLinkFlapConformance	1.3.6.1.4.1.5624.1.2.52.2
etsysLinkFlapGroups	1.3.6.1.4.1.5624.1.2.52.2.1
etsysLinkFlapSystemGroup	1.3.6.1.4.1.5624.1.2.52.2.1.1			A collection of objects providing global configuration and status for the Link Flap feature.
etsysLinkFlapInterfaceGroup	1.3.6.1.4.1.5624.1.2.52.2.1.2			A collection of objects providing interface based configuration, status, and statistics of the Link Flap feature.
etsysLinkFlapNotificationGroup	1.3.6.1.4.1.5624.1.2.52.2.1.3			A collection of notifications for violation of link state transition rates on individual interfaces.
etsysLinkFlapCompliances	1.3.6.1.4.1.5624.1.2.52.2.2
etsysLinkFlapCompliance	1.3.6.1.4.1.5624.1.2.52.2.2.1			The compliance statement for devices that support Link Flap.

RFC description

Enterasys Networks link flap detection MIB automatically limiting effects of frequent link state transitions on network devices.

Start monitoring Enterasys Networks switch (legacy, later Extreme Networks) (Link Flap Detection) 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 ENTERASYS-LINK-FLAP-MIB