HUAWEI-IMA-MIB

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Organization: Huawei Technologies co.,Ltd.

Last Updated: 2009-02-10

Category: ATM, Vendor: Huawei

Description: Huawei IMA MIB for managing Inverse Multiplexing for ATM link groups, member links, and IMA group performance statistics.

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What Is HUAWEI-IMA-MIB?

HUAWEI-IMA-MIB manages Inverse Multiplexing for ATM (IMA), covering IMA link groups, member links, and group-level performance statistics on Huawei equipment. It exposes configuration for how physical links are bundled into an IMA group as well as operational and performance data for the group and its members, placing it in the WAN interface status and performance category. Monitoring it is about hardware link health: checking overall IMA group operational status, individual member-link state, and differential delay between links, since a failed or drifting member link degrades the aggregate ATM circuit's usable bandwidth. It is based on the ATM Forum's IMA specification and complements standard ATM interface MIB concepts. It is deployed on Huawei routers and access equipment using bundled T1/E1 links to build higher-bandwidth ATM circuits, common in legacy carrier access networks. Network engineers evaluating or troubleshooting this functionality can download the HUAWEI-IMA-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in HUAWEI-IMA-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

Huawei routers/access devices with ATM IMA interfaces

Monitoring Examples

An operator would poll the IMA group table for overall operational status and each member-link entry for individual link state and differential delay, detecting when a member link within an IMA bundle has failed or drifted out of tolerance and degraded the aggregate circuit's bandwidth.

What Can Be Monitored

IMA group operational status
member link status
differential delay between links
IMA performance error counters

Imported Objects

From HUAWEI-MIB

hwDatacomm

OBJECT-IDENTITY

From IF-MIB

InterfaceIndex
InterfaceIndexOrZero
ifIndex	OBJECT-TYPE

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
Integer32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
enterprises

From SNMPv2-TC

DateAndTime
RowStatus
TEXTUAL-CONVENTION

How to Use in IPNetwork Monitor

Example using hwImaGroupNumTxActLinks OID:

Select a Huawei router/access device with ATM IMA (Inverse Multiplexing for ATM) interface 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 hwImaGroupNumTxActLinks 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 links which are configured to transmit and are currently Active in this IMA group. 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, 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
hwImaMIB	1.3.6.1.4.1.2011.5.25.176			The MIB is mainly used to configure Inverse Multiplexing for ATM (IMA) interfaces.
hwImaMibObjects	1.3.6.1.4.1.2011.5.25.176.1
hwImaGroupTable	1.3.6.1.4.1.2011.5.25.176.1.1		not-accessible	The IMA Group Configuration table.
hwImaGroupEntry	1.3.6.1.4.1.2011.5.25.176.1.1.1		not-accessible	An entry in the IMA Group table.
NUM hwImaGroupIfIndex	1.3.6.1.4.1.2011.5.25.176.1.1.1.1	InterfaceIndex	read-only	This object identifies the logical interface number ('ifIndex') assigned to this IMA group, and is used to identify corresponding rows in the Interfaces MIB. Note that re-initialization of the management agent may cause a client's 'hwImaGroupIfIndex' to change.
IMA hwImaGroupNeState	1.3.6.1.4.1.2011.5.25.176.1.1.1.2	ImaGroupState	read-only	The current operational state of the near-end IMA Group State Machine.
IMA hwImaGroupFeState	1.3.6.1.4.1.2011.5.25.176.1.1.1.3	ImaGroupState	read-only	The current operational state of the far-end IMA Group State Machine.
IMA hwImaGroupSymmetry	1.3.6.1.4.1.2011.5.25.176.1.1.1.4	ImaGroupSymmetry	read-only	Symmetry of the IMA group.
I32 hwImaGroupMinNumTxLinks	1.3.6.1.4.1.2011.5.25.176.1.1.1.5	Integer32	read-create	Minimum number of transmit links required to be Active for the IMA group to be in the Operational state.
I32 hwImaGroupMinNumRxLinks	1.3.6.1.4.1.2011.5.25.176.1.1.1.6	Integer32	read-create	Minimum number of receive links required to be Active for the IMA group to be in the Operational state.
NUM hwImaGroupTxTimingRefLink	1.3.6.1.4.1.2011.5.25.176.1.1.1.7	InterfaceIndexOrZero	read-only	The ifIndex of the transmit timing reference link to be used by the near-end for IMA data cell clock recovery from the ATM layer. The distinguished value of zero may be used if no link has been configured in the IMA group, or if the transmit timing reference link has not yet been selected.
NUM hwImaGroupRxTimingRefLink	1.3.6.1.4.1.2011.5.25.176.1.1.1.8	InterfaceIndexOrZero	read-only	The ifIndex of the receive timing reference link to be used by near-end for IMA data cell clock recovery toward the ATM layer. The distinguished value of zero may be used if no link has been configured in the IMA group, or if the receive timing reference link has not yet been detected.
I32 hwImaGroupTxImaId	1.3.6.1.4.1.2011.5.25.176.1.1.1.9	Integer32	read-only	The IMA ID currently in use by the near-end IMA function.
I32 hwImaGroupRxImaId	1.3.6.1.4.1.2011.5.25.176.1.1.1.10	Integer32	read-only	The IMA ID currently in use by the far-end IMA function.
IMA hwImaGroupTxFrameLength	1.3.6.1.4.1.2011.5.25.176.1.1.1.11	ImaFrameLength	read-create	The frame length to be used by the IMA group in the transmit direction. Can only be set when the IMA group is startup.
IMA hwImaGroupRxFrameLength	1.3.6.1.4.1.2011.5.25.176.1.1.1.12	ImaFrameLength	read-only	Value of IMA frame length as received from remote IMA function.
MIL hwImaGroupDiffDelayMax	1.3.6.1.4.1.2011.5.25.176.1.1.1.13	MilliSeconds	read-create	The maximum number of milliseconds of differential delay among the links that will be tolerated on this interface.
I32 hwImaGroupAlphaValue	1.3.6.1.4.1.2011.5.25.176.1.1.1.14	Integer32	read-only	This indicates the 'alpha' value used to specify the number of consecutive invalid ICP cells to be detected before moving to the IMA Hunt state from the IMA Sync state.
I32 hwImaGroupBetaValue	1.3.6.1.4.1.2011.5.25.176.1.1.1.15	Integer32	read-only	This indicates the 'beta' value used to specify the number of consecutive errored ICP cells to be detected before moving to the IMA Hunt state from the IMA Sync state.
I32 hwImaGroupGammaValue	1.3.6.1.4.1.2011.5.25.176.1.1.1.16	Integer32	read-only	This indicates the 'gamma' value used to specify the number of consecutive valid ICP cells to be detected before moving to the IMA Sync state from the IMA PreSync state.
G32 hwImaGroupNumTxActLinksEx	1.3.6.1.4.1.2011.5.25.176.1.1.1.17	Gauge32	read-only	The number of links which are configured to transmit and are currently Active in this IMA group.
G32 hwImaGroupNumRxActLinks	1.3.6.1.4.1.2011.5.25.176.1.1.1.18	Gauge32	read-only	The number of links which are configured to receive and are currently Active in this IMA group.
I32 hwImaGroupTxOamLabelValue	1.3.6.1.4.1.2011.5.25.176.1.1.1.19	Integer32	read-only	IMA OAM Label value transmitted by the NE IMA unit.
I32 hwImaGroupRxOamLabelValue	1.3.6.1.4.1.2011.5.25.176.1.1.1.20	Integer32	read-only	IMA OAM Label value transmitted by the FE IMA unit. The value 0 likely means that the IMA unit has not received an OAM Label from the FE IMA unit at this time.
NUM hwImaGroupFirstLinkIfIndex	1.3.6.1.4.1.2011.5.25.176.1.1.1.21	InterfaceIndex	read-only	This object identifies the first link of this IMA Group.
hwImaLinkTable	1.3.6.1.4.1.2011.5.25.176.1.2		not-accessible	The IMA group Link Status and Configuration table.
hwImaLinkEntry	1.3.6.1.4.1.2011.5.25.176.1.2.1		not-accessible	An entry in the IMA Group Link table.
NUM hwImaLinkIfIndex	1.3.6.1.4.1.2011.5.25.176.1.2.1.1	InterfaceIndex	not-accessible	This corresponds to the 'ifIndex' of the MIB-II interface on which this link is established. This object also corresponds to the logical number ('ifIndex') assigned to this IMA link.
NUM hwImaLinkGroupIfIndex	1.3.6.1.4.1.2011.5.25.176.1.2.1.2	InterfaceIndex	read-create	This object identifies the logical interface number ('ifIndex') assigned to this IMA group. The specified link will be bound to this IMA group.
IMA hwImaLinkNeTxState	1.3.6.1.4.1.2011.5.25.176.1.2.1.3	ImaLinkState	read-only	The current state of the near-end transmit link.
IMA hwImaLinkNeRxState	1.3.6.1.4.1.2011.5.25.176.1.2.1.4	ImaLinkState	read-only	The current state of the near-end receive link.
IMA hwImaLinkFeTxState	1.3.6.1.4.1.2011.5.25.176.1.2.1.5	ImaLinkState	read-only	The current state of the far-end transmit link as reported via ICP cells.
IMA hwImaLinkFeRxState	1.3.6.1.4.1.2011.5.25.176.1.2.1.6	ImaLinkState	read-only	The current state of the far-end receive link as reported via ICP cells.
ROW hwImaLinkRowStatus	1.3.6.1.4.1.2011.5.25.176.1.2.1.51	RowStatus	read-create	The hwImaLinkRowStatus object allows create, change, and delete operations on hwImaLinkTable entries. To create a new conceptual row (or instance) of the hwImaLinkTable, hwImaLinkRowStatus must be set to 'createAndWait' or 'createAndGo'. A successful set of the imaLinkGroupIndex object must be performed before the hwImaLinkRowStatus of a new conceptual row can be set to 'active'. To change (modify) the imaLinkGroupIndex in an hwImaLinkTable entry, the hwImaLinkRowStatus object must first be set to 'notInService'. Only then can this object in the conceptual row be modified. This is due to the fact that the imaLinkGroupIndex object provides the association between a physical IMA link and the IMA group to which it belongs, and setting the imaLinkGroupIndex object to a different value has the effect of changing the association between a physical IMA link and an IMA group. To place the link 'in group', the hwImaLinkRowStatus object is set to 'active'. While the row is not in 'active' state, both the Transmit and Receive IMA link state machines are in the 'Not In Group' state. To remove (delete) an hwImaLinkTable entry from this table, set this object to 'destroy'.
hwImaMibConformance	1.3.6.1.4.1.2011.5.25.176.2
hwImaMibGroups	1.3.6.1.4.1.2011.5.25.176.2.1
hwImaGroupGroup	1.3.6.1.4.1.2011.5.25.176.2.1.1			A set of objects providing configuration and status information for an IMA group definition.
hwImaLinkGroup	1.3.6.1.4.1.2011.5.25.176.2.1.2			A set of objects providing status information for an IMA link.
hwImaMibCompliances	1.3.6.1.4.1.2011.5.25.176.2.2
hwImaMibCompliance	1.3.6.1.4.1.2011.5.25.176.2.2.1			The compliance statement for network elements implementing Inverse Multiplexing for ATM (IMA) interfaces.

RFC description

Huawei vendor-private MIB for Inverse Multiplexing over ATM (IMA) management, configuring IMA groups and monitoring frame delivery on ATM interfaces.

Start monitoring Huawei router/access device with ATM IMA (Inverse Multiplexing for ATM) interfaces 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 HUAWEI-IMA-MIB