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LACP OperLastChange Not Representative Of Last Change

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TitleLACP OperLastChange Not Representative Of Last Change
Symptoms
  • Value of Link Aggregation Control Protocol (LACP) OperLastChange is stuck
  • Calculation method not easy to understand when LACP OperLastChange viewed in show lacp interface command.
Using example below:
  • Calculation based on SysUpTime and port state change for port member of LACP/MLT.
  • Subtract 240 days from May 17, 2018 to get September 19, 2017
  • September 19, 2017 matches port 1/39 admin down since boot
  • Port 1/40 is member of LACP MLT-ID 40 showing 8 days
  • Add 8 days from LACP OperLastChange to Sept 19, 2017 equals Sept 27, 2017
Session log Thu May 17 16:13:44 2018
SysUpTime    : 240 day(s), 06:40:54
----------------------------------------------------------------------------------------------------
                    OPER             OPERLAST
MLTID IFINDEX       STATE             CHANGE
----------------------------------------------------------------------------------------------------
40    6183            up              8 day(s), 05:21:46

====================================================================================================
                                   Port State
====================================================================================================
PORT NUM   ADMINSTATUS  PORTSTATE   REASON        DATE
----------------------------------------------------------------------------------------------------
1/39       down         down        --            09/19/17 09:33:02
1/40       up           up          --            09/27/17 15:28:05

 
Environment
  • VSP 7200
  • VSP 8000
  • VSP 4000
  • Release 6.1.x,x
  • Release 7.0.0.0
Cause
Software defect VOSS-10551
Resolution
  • Upgrade to 7.1.0.0
Additional notes
Fix will not be in 6.1.x.x release.

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