MRTG down since IOS upgrade

[jim]

Last week MRTG began failing on four of six 3640's following IOS update from ver 12.3(1a) to 12.3(4)T2. After MRTG launches on each, I get the following error:

Received SNMP response with error code

error status: noSuchName

index 1 <OID:1.3.6.1.2.1.2.2.1.10.27>

SNMPv1_Session <remote host...info all correct...

ERROR: Target [10.9.0.1_27][_IN_] ' $target->[0]{$mode} ' did not eval into defined data

ERROR: Target [10.9.0.1_27][_OUT_] ' $target->[0]{$mode} ' did not eval into defined data

Use of uninitialized value in numeric lt <<> at mrtg line 371.

Use of uninitialized value in numeric lt <<> at mrtg line 375.

All six units were upgraded the same way. Why would four of the six fail? Would upgrading to the latest ver of MRTG help? Appreciate any advice.

[rmushtaq]

After the IOS upgrade and reboot of the devices, the ifIndex may changed (http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080134eec.shtml), which you need to check and update the MRTG cfg file accordingly.

[jpandzik]

Good call! In addition to the IOS upgrade, new interface card added which changed index numbers. Thank you.