Aruba 5400R zl2 (KB.16.05.0007) system uptime reset after 500 days of switch uptime

[parnassus]

Hi all!

I recall I've read something related to show uptime providing misleading values...but I don't recall if it was related to ArubaOS-CX or to ArubaOS-Switch...no matter...today we discovered that, after more than 500 days of system uptime, our two Aruba 5400R zl2 switches (both running KB.16.05.0007, yes...they were running a little bit old software version) show a system uptime of about 2 days only...as they were just rebooted two days ago (which - I'm pretty sure - didn't happen at all).

Is anybody able to help me in finding where this (probable) bug was recognized and which exact Software Branch/Versions solved it?

Thanks in advance.

[Emil_G · Accepted solution]

Hello, 

I have seen this before and I think it is normal and not a bug. It looks like the switch is obtaining the uptime from an SNMP OID (I think it is sysUpTime) which has a 32 bit counter.  This counter measures the time in hundreds of seconds and it resets itself to 0 after 497 days.

You can find some more detailed explenations on the internet. I couldnt find an HP document about it but I should be the same reason.

[parnassus]

Hi Emil!

Gosh..that's reasonable...that's the issue...centiseconds counting...if only sysUpTime polling will happen every 1 second (instead of every 1/100 of second)...the upper limit will be 49710 days...if the polling will happen every 1/10 of second the upper limit will be 4971 days...better...so...I've to say goodbye to good old days where an HP ProCurve 9308m Routing Switch easily reached this uptime:

HP_9308M#show version   
  SW: Version 07.8.00aT53 Hewlett-Packard Company
      Compiled on Oct 04 2004 at 21:29:05 labeled as H2R07800a
      (3638354 bytes) from Primary h2r07800a.bin
      J4138A HP ProCurve Routing Switch 9308M
  HW: ProCurve HP9308 Routing Switch, SYSIF version 21, Serial #: xxxxxxxxxx
==========================================================================
SL 1: J4885A EP 8 port mini-GBIC Management Module, SYSIF 2 (Mini GBIC), M4, ACTIVE
      Serial #:   xxxxxxxxxx
 4096 KB BRAM, JetCore ASIC IGC version 49, BIA version 8a
32768 KB PRAM and 2M-Bit*1 CAM for IGC  0, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC  1, version 0449
==========================================================================
SL 2: J4885A EP 8 port mini-GBIC Management Module, SYSIF 2 (Mini GBIC), M4, STANDBY
      Serial #:   xxxxxxxxxx
 4096 KB BRAM, JetCore ASIC IGC version 49, BIA version 8a
32768 KB PRAM and 2M-Bit*1 CAM for IGC  4, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC  5, version 0449
==========================================================================
SL 3: J4895A EP 16-port 100/1000-T Module, SYSIF 2
      Serial #:   xxxxxxxxxx
 4096 KB BRAM, JetCore ASIC IGC version 49, BIA version 8a
32768 KB PRAM and 2M-Bit*1 CAM for IGC  8, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC  9, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC 10, version 0449           
32768 KB PRAM and 2M-Bit*1 CAM for IGC 11, version 0449
==========================================================================
SL 4: J4895A EP 16-port 100/1000-T Module, SYSIF 2
      Serial #:   xxxxxxxxxx
 4096 KB BRAM, JetCore ASIC IGC version 49, BIA version 8a
32768 KB PRAM and 2M-Bit*1 CAM for IGC 12, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC 13, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC 14, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC 15, version 0449
==========================================================================
SL 5: J4895A EP 16-port 100/1000-T Module, SYSIF 2
      Serial #:   xxxxxxxxxx
 4096 KB BRAM, JetCore ASIC IGC version 49, BIA version 8a
32768 KB PRAM and 2M-Bit*1 CAM for IGC 16, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC 17, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC 18, version 0449
32768 KB PRAM and 2M-Bit*1 CAM for IGC 19, version 0449
==========================================================================
Active management module:
  466 MHz Power PC processor 750 (version 8/8302) 66 MHz bus
  512 KB boot flash memory
16384 KB code flash memory
  512 KB SRAM                                                     
  512 MB DRAM
Standby management module:
  466 MHz Power PC processor 750 (version 8/8302) 66 MHz bus
  512 KB boot flash memory
16384 KB code flash memory
  512 KB SRAM
  512 MB DRAM
The system uptime is 3115 days 20 hours 54 minutes 36 seconds 
The system started at 13:07:44 GMT+01 Mon Jan 10 2011

The system : started=cold start

8-)