IV11270: CDP AGENT RUNS INTO INFINITE LOOP - CAUSING OUT OF MEMORY CONDITION

ITNMIP_Patch_V3.8.0.89_Win32
3.8.0-TIV-ITNMIP-Solaris-REF-FP0007
3.8.0-TIV-ITNMIP-Linux-REF-FP0007
ITNMIP_Patch_V3.8.0.89_AIXPPC32
IBM Tivoli Network Manager IP 3.9.0 Fix Pack 3, 3.9.0-TIV-ITNMIP-FP0003
IBM Tivoli Network Manager IP 3.9.0 Fix Pack 4, 3.9.0-TIV-ITNMIP-FP0004
IBM Tivoli Network Manager IP Edition 3.9.0 Fix Pack 5, 3.9.0-TIV-ITNMIP-FP0005

APAR status

• Closed as program error.

Error description

• ITNM 3.8 FP6
  Sun OS 10
  Customer discovers a device that is causing the CDP agent to go
  into a loop until it runs out of memory.  Excerpt from the CDP
  agent trace:
  
  CRivValidAddress::RVAIsIpValid( ipLong =
  xxx.xx.xxx.xx,
  allowMulticast = False, allowLoopback = True, isSubnet = False).
  Returning validIp = True
  found something good
  CDiscoCDPAgent: CDPCreateLocalNbr done
  CDiscoCDPAgent: CDPCreateLocalNbr()
  
  
  Final entry from CDP agent log file:
  
  11/03/11 23:19:57: Fatal: [29t] CRivError.cc(359) Out-of-memory
  - This process has run out of memory or exceeded the operating
  system memory limit for a 32 bit application - You must take
  action to reduce the amount of data this application is having
  to process new handler called
  11/03/11 23:19:57: Information: [29t] CDP shutdown
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ITNM-IP 3.8 on all platform, i.e. Windows, Linux, Solaris    *
  * and AIX                                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * 1) The CDP agent ran into infinite loop while discovering    *
  * Cisco NX-OS n7000 device which at the end, results in out of *
  * memory message being generated in the trace file.            *
  * 2) Warning messages are flooded in agent log file:           *
  * Thu Dec  8 14:19:13 2011  Warning: A generic non-fatal error *
  * has occurred found in file CDiscoProcessedData.cc at line    *
  * 167 - failed to add data                                     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * The fix for this APAR is contained in the following          *
  * maintenance packages:                                        *
  * |fix pack|3.8.0-ITNMIP-FP0007|                               *
  * |fix pack|3.9.0-ITNMIP-FP0001|                               *
  ****************************************************************
  

Problem conclusion

• 1) Fix CDP agent code to avoid running into infinite loop
  2) Avoid the warning message being generated by adding check for
  duplicate cefexBindingExtenderIndex value, e.g.:
  SNMPv2-SMI::enterprises.9.9.691.1.1.1.1.2.369098852 = Gauge32:
  101
  SNMPv2-SMI::enterprises.9.9.691.1.1.1.1.2.440442880 = Gauge32:
  101
  

Temporary fix

Comments

APAR Information

• 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

  NC/PREC DISCOVY

• Fixed component ID

  5724O52DS

Applicable component levels

• R380 PSY

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