CISCO-MAU-EXT-MIB

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Organization: Cisco Systems, Inc.

Last Updated: 2008-03-05

Category: Cisco Devices, Network Interfaces

Description: Extends MAU MIB with Cisco-specific physical layer attributes for network interface medium attachment units.

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What Is CISCO-MAU-EXT-MIB?

CISCO-MAU-EXT-MIB is a Cisco extension to the IETF MAU-MIB (RFC 3636), adding vendor-specific management objects for Ethernet Medium Attachment Units (MAUs) and physical jacks not covered by the standard MIB. It exposes physical-layer configuration and status data such as jack state, Auto-MDIX configuration, and MAU traffic type. Its monitoring value lies in hardware-level interface health: detecting jack connection state, whether auto-crossover (Auto-MDIX) is enabled per interface, and the traffic type reported by the MAU, which together help diagnose cabling and link-negotiation problems at the physical layer. As an extension MIB, it explicitly depends on and is used alongside the standard MAU-MIB (RFC 3636) and the Interfaces MIB (RFC 2863). It is deployed on Cisco switches and routers with copper/fiber Ethernet ports where administrators need finer-grained physical-layer diagnostics than the base MAU-MIB provides. Engineers can download the CISCO-MAU-EXT-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-MAU-EXT-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 switch
Cisco router with Ethernet interfaces

Monitoring Examples

An administrator would poll cmExtJackConfigTable's cmExtJackState to determine whether a physical jack is connected, disconnected, or in a fault state, useful for diagnosing a port that shows link-down. The cmExtIfAutoMdixConfigTable's cmExtIfAutoMdixEnabled object reveals whether auto-MDIX is active on an interface, explaining straight-through vs. crossover cable behavior. cmExtIfMauTrafficTable's cmExtIfMauTrafficType helps confirm whether the MAU is reporting the expected traffic/duplex mode, flagging a mismatch that could cause degraded link performance.

What Can Be Monitored

jack connection state
Auto-MDIX enabled status
MAU traffic type
physical interface link diagnostics

Imported Objects

From CISCO-SMI

ciscoMgmt

OBJECT-IDENTITY

From MAU-MIB

ifJackEntry	OBJECT-TYPE
ifMauIfIndex	OBJECT-TYPE
ifMauIndex	OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

TruthValue

How to Use in IPNetwork Monitor

Example using cmExtJackState OID:

Select a Cisco switch/router with Ethernet interface (MAU extensions) 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 cmExtJackState 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. Indicates the state of a particular jack. Within a particular MAU, setting this to 'active' on a jack which is not the current active jack will deactivate the current active jack. 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 value changes unexpectedly, since which jack should be active depends on your cabling and an unplanned change often indicates a fault or manual intervention. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
ciscoMauExtMIB	1.3.6.1.4.1.9.9.398			A MIB module for extending the MAU-MIB (RFC 3636) to add objects which provide additional management information about MAU or Jack not available in MAU-MIB.
cmExtMIBNotifs	1.3.6.1.4.1.9.9.398.0
cmExtMIBObjects	1.3.6.1.4.1.9.9.398.1
cmExtMauConfig	1.3.6.1.4.1.9.9.398.1.1
cmExtJackConfigTable	1.3.6.1.4.1.9.9.398.1.1.1		not-accessible	This table contains management information about MAUs attached to interfaces with managed jacks. The objects in this table are in addition to the objects in the ifJackTable.
cmExtJackConfigEntry	1.3.6.1.4.1.9.9.398.1.1.1.1		not-accessible	An entry containing additional management information for a particular jack.
INT cmExtJackStateEx	1.3.6.1.4.1.9.9.398.1.1.1.1.1	INTEGER	read-write	Indicates the state of a particular jack. Within a particular MAU, setting this to 'active' on a jack which is not the current active jack will deactivate the current active jack. Setting the current active jack to 'active' has no effect. A value of inactive(2) indicates that the jack is currently deactiveated. Setting this to 'inactive' has no effect. Of all the jacks connected to a MAU, at least one must be active at all times.
cmExtAutoMdixConfig	1.3.6.1.4.1.9.9.398.1.2
cmExtIfAutoMdixConfigTable	1.3.6.1.4.1.9.9.398.1.2.1		not-accessible	This table contains Auto-MDIX configuration information for MAUs attached to interfaces in the device. An entry appears in this table for each active Auto-MDIX capable MAU connected to interfaces in the device.
cmExtIfAutoMdixConfigEntry	1.3.6.1.4.1.9.9.398.1.2.1.1		not-accessible	An entry containing Auto-MDIX configuration information for a MAU connected to the interface.
T/F cmExtIfAutoMdixEnabled	1.3.6.1.4.1.9.9.398.1.2.1.1.1	TruthValue	read-write	Specifies if Auto-MDIX feature is enabled on the MAU.
cmExtIfMau	1.3.6.1.4.1.9.9.398.1.3
cmExtIfMauTrafficTable	1.3.6.1.4.1.9.9.398.1.3.1		not-accessible	The (conceptual) table that identifies the type of traffic carried by the interfaces associated with the MAUs in the device. This table is sparse dependant on ifMauTable.
cmExtIfMauTrafficEntry	1.3.6.1.4.1.9.9.398.1.3.1.1		not-accessible	An entry (conceptual row) in the cmExtIfMauTrafficEntry. Each entry contains the type of traffic carried by the interface associated with the MAU identified by the indices.
INT cmExtIfMauTrafficType	1.3.6.1.4.1.9.9.398.1.3.1.1.1	INTEGER	read-only	This object is used to identify the type of traffic carried by the MAU. This object can take the following values other(1) - The traffic type is other than anything defined below adminControl(2) - This interface carries administrative and control traffic that is internal to the device user(3) - This interface carries the user data traffic
cmExtMIBConformance	1.3.6.1.4.1.9.9.398.2
cmExtMIBCompliances	1.3.6.1.4.1.9.9.398.2.1
cmExtMIBCompliance	1.3.6.1.4.1.9.9.398.2.1.1			The compliance statement for entities which implement the Cisco MAU extension MIB.
cmExtMIBCompliance2	1.3.6.1.4.1.9.9.398.2.1.2			The compliance statement for entities which implement the Cisco MAU extension MIB.
cmExtMIBCompliance3	1.3.6.1.4.1.9.9.398.2.1.3			The compliance statement for entities which implement the Cisco MAU extension MIB.
cmExtMIBGroups	1.3.6.1.4.1.9.9.398.2.2
cmExtJackConfigGroup	1.3.6.1.4.1.9.9.398.2.2.1			A collection of objects providing the configuration information about MAUs attached to interfaces with managed jacks.
cmExtIfAutoMdixConfigGroup	1.3.6.1.4.1.9.9.398.2.2.2			A collection of objects providing the configuration information of Auto-MDIX feature in the device.
cmExtIfMauTrafficGroup	1.3.6.1.4.1.9.9.398.2.2.3			Object that provides the type of traffic carried by MAUs in devices having admin or control traffic internal to the device.

RFC description

Cisco extension to RFC 3636 MAU-MIB providing additional management information about MAU and jack interfaces.

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