Ports on SRX550 not working

  • 1.  Ports on SRX550 not working

    Posted 03-16-2021 08:48

    We have SRX550 cluster but devices are already out of RMA/support and on one node ethernet ports  stops working. When we checked node, device looks ok and no alarms in system or chassis. Junos on device/cluster was older JUNOS 12.1X46-D40.2. So first idea was, switch chip is dead, probably or other HW problem. But then i swapped RAM for 4GB ECC and 8GB CF card (like on HM model). And upgrade Junos to 15.1X49-D240 and for my surprise ports starts working again. Then i swapped CF and RAM for original and flash device with last supported version 12.3X48-D105 and ports stops working again, only port ge-0/0/0 goes UP and left LED is still ON but no data transmission. Then i tried to use 4GB RAM + 8GB CF with Junos 12.3X48-D105 but same problem like with non-original RAM/CF.

    Any idea where can be a problem ? On Junos 15 device work just fine but its not recommended for this device

    Thanks :)

    Patrik Pavlik