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IV28101: NOSUCHNAME EVENTS GENERATED FOR ENTITIES THAT WERE POLLING WITHOUT ERROR.

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Product:  Tivoli Network Manager
    Version: 3.8
    Component: ncp_poller
    
    
    Replication:
    Configure SNMP Link State poll policy *with* interface scoping.
    (Policies without interface scopes will not trigger this APAR).
    Failover to the Backup domain by stopping the entire Primary
    domain.
    (Failing over by stopping a monitored component will not trigger
    this APAR).
    Failback by restarting the Primary domain.
    
    
    
    Symptoms:
    On failback the SNMP Link state policy may produce alerts
    reporting No Such Name found for the monitored interfaces.
    In the default product the symptoms are intermittant and may
    not occur on every occasion.
    
    L3 can replicate consistently in a development environment where
    a delay can be hard coded into the software.
    
    
    Cause:
    When a poll policy is initialised, various ncpoller tables are
    populated with information about the poll. This includes, for
    example, the OIDs to query and the target addresses to poll.
    
    When the SNMP Link State poll policy is configured without
    interface scoping, there is no problem - we walk through the
    whole of the ifTable.
    
    To select individual rows from a table, the table index forms
    part of the requested OID, and the ifTable is indexed on
    ifIndex. With interface scoping, the individual in-scope
    instances (the ifIndex values that indicate the rows of
    interest) are added to an additional ncpoller table. When
    querying the target, we request multiple OIDs per SNMP Get
    request, where each OID is one of the base OIDs
    (ifAdminStatus/ifOperStatus) with the appropriate ifIndex
    instance value appended.
    
    There is a small margin in which the poll can be triggered
    before that instance data is available in the ncpoller data.
    When this occurs, the request is incorrectly dispatched without
    the necessary instance suffix. As an SNMP Get request is used,
    there is no such OID available to query. The SNMP Get Request
    contains just the incomplete, instance-less
    ifAdminStatus/ifOperStatus OIDs, and the device responds with a
    NO SUCH NAME error.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ITNM 3.8 poller users. Platform independent.                 *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * On failback configured SNMP Link state policies, which use   *
    * interface filtering, may start producing alerts reporting    *
    * NOSUCHNAME found  for the monitored interfaces. In the       *
    * default product the symptoms are intermittent and may not    *
    * occur on every occasion.                                     *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Suggest to upgrade to product version 3.8.0-ITNMIP-FP0007    *
    ****************************************************************
    

Problem conclusion

  • The code has been updated such that SNMP Link state and
    Threshold poll policies configure the poller data structures
    with the appropriate data required to build the OIDs prior to
    starting the polling mechanism.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV28101

  • Reported component name

    TIV NETWK MGR I

  • Reported component ID

    5724S4500

  • Reported release

    380

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-09-17

  • Closed date

    2013-07-09

  • Last modified date

    2013-07-09

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    TIV NETWK MGR I

  • Fixed component ID

    5724S4500

Applicable component levels

  • R380 PSN

       UP

  • R380 PSY

       UP

  • R390 PSN

       UP

  • R390 PSY

       UP

  • R401 PSN

       UP

  • R401 PSY

       UP

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Document Information

Modified date:
09 July 2013