I have 2 HP 2920 switches and they aren't stacking as I'm expecting.
Both models are the J9729A, however one is Aruba branded and one is the original HP brand. Everywhere I read this shouldn't be an issue, and the Aruba rebrand was simply that - a rebrand with no technical change.

Both switches are detecting the stacking module in the rear - both have the module light lit. However there doesn't appear to be a link between the switches as the port 1 and/or port 2 lights are not lit. As well running show stacking detail shows both ports as inactive. I've tried connecting the stacking ports in all combinations 1>1 , 1>2 , 2>1 and 2>2.

Stacking is enabled on both, and I've tried following the procedures here with no luck. http://h22208.www2.hpe.com/eginfolib/networking/docs/switches/WB/15-18/5998-8156_wb_2926_atmg/content/ch06s02.html

I've tried firmwares 16.03.0003, 16.03.0007, and 16.05.0007 (Latest).

I've now tried doing an erase all and stacking factory-reset on both, then powered on one switch fully, entered stacking set-stack, then the other. Still not detecting the link and both switches are acting as their own Commander.

Do you have any idea what could be going on here?

  • Sounds like the cable is bad - have you tried another one? I think they are standard SFF-8614/8644 cables like the ones used for SAS.
    – Zac67
    May 22, 2018 at 10:50
  • Had that thought as well, and I'm currently getting another one sent. I hope that's it - will update with my findings once received. May 22, 2018 at 10:54
  • Can you share the information from show stacking stack-ports? May 23, 2018 at 10:56
  • @Roger So executing that was showing both ports as Down. After replacing the cable it's working as expected, both ports showing up on both switches. May 23, 2018 at 12:38

1 Answer 1


This was due to either a faulty or incompatible cable

The cable which I was having trouble with has Amphenol branding on it and part number;
HP P/N: 691970-001 REV G

The cable which is working is HP branded and has the J9735A Part Number on it.

  • You should accept your answer so that the question doesn't keep popping up forever, looking for an answer.
    – Ron Maupin
    May 23, 2018 at 12:53
  • @Ron Will do in 20hrs - when I'm allowed. May 23, 2018 at 12:59

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