Reasons for Stack unit going into Reserve state

[Smiley]

Issue: Unit 3 status is showing as reserve state under the show stack output below:

ICX7750-26Q Router# show stack

T=1d17h49m48.5: alone: standalone, 😧 dynamic cfg, S: static

ID      Type                   Role             Mac Address            Pri     State       Comment

1 S ICX7750-26QXG active      cc4e.2438.7280            128     local         Ready

2 S ICX7750-26QXG member   748e.f8f9.6300           128     remote       Ready

3 S ICX7750-26QXG member   0000.0000.0000           0        reserve

4 D ICX7750-48XGF member   609c.9f7f.9400            128     remote      Ready

Reasons:

-If unit stuck in boot loop.    

-If there is a physical layer issue such as stacking cable, stacking module.

-If unit is faulty or hardware issue.

Recovery Steps:

If unit stuck in boot loop.

-Try software recovery by taking console access for this unit.

https://docs.commscope.com/bundle/fastiron-08095-upgradeguide/page/GUID-9B5D5A56-039D-44FB-8FD2-B9B5...

-Try power cycling the switch after removing it from the stack.

-Check if it’s related to any known defect.

-Try factory resetting the switch.

-Try below steps by removing switch from the stack taking console access.

>>Enter switch boot mode
>>Give command: use default-configuration
>>Reload the switch.

If there is a physical layer issue such as stacking cable, stacking module.

-Try changing the stacking cables and stacking ports.

If unit is faulty or hardware issue

-Switch not powering on try checking the power cable and power source.

-Replace the switch with the same model if switch fails to power on.