CISCO-L2-DEV-MONITORING-MIB

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Organization: Cisco System Inc.

Last Updated: 2003-07-22

Category: Cisco Devices, Network Monitoring (RMON), VLAN and Bridging

Description: Monitors Layer 2 device health metrics including CPU, memory, and interface error statistics.

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What Is CISCO-L2-DEV-MONITORING-MIB?

This is a Cisco enterprise MIB used on Cisco Layer 2 wireless bridge/radio equipment to support hot-standby monitoring, where a standby L2 device supervises the health of an active peer device and manages switch-over configuration. It exposes standby-mode status, notification enablement, and a table of monitored active-device entries keyed by MAC address, along with polling frequency and timeout parameters. It is explicitly used to monitor the availability/hardware status of the active device from the standby's perspective, functioning as a heartbeat check that detects when the active unit stops responding within its configured timeout, triggering failover. It relies on general Cisco enterprise MIB and standard SNMP notification conventions rather than any specific external standard. It is deployed in redundant Cisco point-to-point or point-to-multipoint wireless bridge pairs configured for hot-standby operation, where the standby unit continuously checks on the active unit's presence. Network engineers evaluating or troubleshooting this functionality can download the CISCO-L2-DEV-MONITORING-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-L2-DEV-MONITORING-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 wireless bridge/radio
Cisco Layer 2 hot-standby device pair

Monitoring Examples

An administrator polls cl2DevMonActiveTable/cl2DevMonActiveEntry rows, keyed by cl2DevMonActiveMacAddress, to see which active device the standby unit is supervising along with cl2DevMonActivePollingFrequency and cl2DevMonActivePollingTimeOut. If the active device stops responding within the configured timeout, cl2DevMonInStandbyMode changes and, if cl2DevMonNotifEnabled is set, a notification is raised indicating a switchover condition. Changes to a monitored entry's lifecycle are tracked via cl2DevMonActiveRowStatus, letting an operator confirm whether a peer entry is active, being created, or removed.

What Can Be Monitored

active device reachability
standby mode status
polling frequency
polling timeout
peer MAC address
notification enablement

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From IF-MIB

InterfaceIndex

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

MacAddress
RowStatus
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoL2DevMonMIB	1.3.6.1.4.1.9.9.271			This MIB module is for monitoring of active layer 2 devices by hot standby layer 2 devices and the configuration of hot standby switch-over parameters.
ciscoL2DevMonMIBNotifications	1.3.6.1.4.1.9.9.271.0
NTF cl2DevMonSwitchover	1.3.6.1.4.1.9.9.271.0.1			This cl2DevMonSwitchover notification will only be sent when this device changes its cl2DevMonInStandbyMode to FALSE and becomes an active unit. The sending of these notifications can be enabled/disabled via the cl2DevMonNotifEnabled object.
ciscoL2DevMonMIBObjects	1.3.6.1.4.1.9.9.271.1
cl2DevMonConfig	1.3.6.1.4.1.9.9.271.1.1
T/F cl2DevMonInStandbyMode	1.3.6.1.4.1.9.9.271.1.1.1	TruthValue	read-write	If the value of this variable is TRUE, this device is in monitoring or standby mode and it will poll for the health of the devices on the cl2DevMonActiveTable. If the value of cl2DevMonInStandbyMode is FALSE, it only can be set back to TRUE using command line interface or SNMP request. The value can be set to FALSE only by the device itself because force switch over from standby mode to active mode is not allowed.
T/F cl2DevMonNotifEnabled	1.3.6.1.4.1.9.9.271.1.1.2	TruthValue	read-write	Indicates whether cl2DevMonSwitchover notifications will or will not be sent by the device when it changes its cl2DevMonInStandbyMode to FALSE and becomes an active unit.
cl2DevMonActiveTable	1.3.6.1.4.1.9.9.271.1.1.3		not-accessible	The table for active devices on the network being monitored by the hot standby monitoring unit. This table is on the hot standby monitoring unit. All entries on this table will only be added, deleted, modified using command user interface or SNMP request.
cl2DevMonActiveEntry	1.3.6.1.4.1.9.9.271.1.1.3.1		not-accessible	An entry in the cl2DevMonActiveTable table.
MAC cl2DevMonActiveMacAddress	1.3.6.1.4.1.9.9.271.1.1.3.1.1	MacAddress	not-accessible	Mac address of the active unit to be monitored by this hot standby monitoring unit.
U32 cl2DevMonActivePollingFrequency	1.3.6.1.4.1.9.9.271.1.1.3.1.2	Unsigned32	read-create	The frequency, in seconds, the active unit specified by cl2DevMonActiveMacAddress is polled for its health.
U32 cl2DevMonActivePollingTimeOut	1.3.6.1.4.1.9.9.271.1.1.3.1.3	Unsigned32	read-create	The total time, in seconds, the standby monitoring unit can tolerate the failure of polling of the active unit. After this duration, one more failure of the polling will trigger this hot standby monitoring unit to take over and become an active unit. It then will stop monitoring other active units and set value of cl2DevMonInStandbyMode to FALSE.
ROW cl2DevMonActiveRowStatus	1.3.6.1.4.1.9.9.271.1.1.3.1.4	RowStatus	read-create	The status column used for creating, modifying, and deleting instances of the columnar objects in the cl2DevMonActiveTable table. Creation of rows must be done via 'createAndGo' and all columns are mandatory. This object will become 'active' if the NMS performs a multivarbind set including this object. Any object in a row can be modified any time when the row is in the 'active' state. Removal of a row can be done via setting this object to 'destroy'.
INT cl2DevMonActiveRadioMacType	1.3.6.1.4.1.9.9.271.1.1.3.1.5	INTEGER	read-create	If the device being monitored is a IEEE 802.11 Wireless device, cl2DevMonActiveMacAddress is the remote device radio MAC address and this is the type of IEEE 802.11 Standard applies that radio: ieee802dot11a(1) - IEEE 802.11a Standard, ieee802dot11b(2) - IEEE 802.11b Standard, ieee802dot11g(3) - IEEE 802.11g Standard. If the device being monitored is not a IEEE 802.11 Wireless device, the default value for this object is '0'.
NUM cl2DevMonActiveLocalRadioIndex	1.3.6.1.4.1.9.9.271.1.1.3.1.6	InterfaceIndex	read-create	If the device being monitored is a IEEE 802.11 Wireless LAN device, this is the ifIndex of a local radio of ifType ieee80211(71) used for the monitoring. If the local radio only supports to monitor only one remote radio, adding or updating multiple rows to the same ifIndex is not allowed.
ciscoL2DevMonMIBConformance	1.3.6.1.4.1.9.9.271.2
ciscoL2DevMonMIBCompliances	1.3.6.1.4.1.9.9.271.2.1
ciscoL2DevMonCompliance	1.3.6.1.4.1.9.9.271.2.1.1			The compliance statement for the ciscoL2DevMonConfig group.
ciscoL2DevMonComplianceRev1	1.3.6.1.4.1.9.9.271.2.1.2			The compliance statement for the ciscoL2DevMonConfig group.
ciscoL2DevMonMIBGroups	1.3.6.1.4.1.9.9.271.2.2
ciscoL2DevMonConfigGroup	1.3.6.1.4.1.9.9.271.2.2.1			Management information to support operation of L2 monitoring and hot standby.
ciscoL2DevMonNotificationGroup	1.3.6.1.4.1.9.9.271.2.2.2			The notifications for the CISCO-L2-DEV-MONITORING-MIB
ciscoL2DevMonRadioConfigGroup	1.3.6.1.4.1.9.9.271.2.2.3			Management information to identify the MAC type of a IEEE 802.11 Wireless LAN device and local radio ifIndex.

RFC description

Cisco Layer 2 device monitoring MIB for hot standby device switchover and monitoring configuration.

Start monitoring Cisco wireless bridge/radio (Layer 2 hot-standby pair) 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-L2-DEV-MONITORING-MIB

What Is CISCO-L2-DEV-MONITORING-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description