This Article explains the steps need to be taken to root cause and/or resolve the issue when port/s does not come up after upgrade on QFX switch.

Port or multiple ports does not come up after upgrade on QFX switch

In case when port stays down after an upgrade, please follow below steps to resolve the issue and collect outputs to root cause the issue.

• In case if it is a one off issue, follow the below steps to recovery
  1. Bounce the ports from cli.
  2. If the issue persist, perform a soft OIR from shell following the KB [QFX] Port remains down after an upgrade.  It is recommended to perform this under JTAC guidance.
  3. If the port still stays down, perform the troubleshooting mentioned in the KB [Junos] Layer 1 troubleshooting - Physical interface down/flapping 
• If it is a recurring issue or reported on multiple devices, it is recommended to involve JTAC and collect below outputs before and after performing recovery. Recovery steps are same as mentioned above.

  • Data collection plan:

    show chassis hardware
    show interfaces extensive <>
    show interfaces diagnostics optics <>
    show chassis pic fpc-slot 0 pic-slot 0
    show chassis led
    
    start shell
    vty fpc0
    show syslog messages
    show qsfp list >>>>>> get the index ID for affected ports
     
    show qsfp <$id> alarms
    show qsfp <$id> diagnostics
    show qsfp <$id> info
    show qsfp <$id> identifier
    show qsfp <$id> i2c_accel_err
    show dcbcm ifd all >>>>>>> get the port-name

• • Bcm commands: JTAC guidance is highly recommended to run these commands
    set dcb diag >>>>>>>> [to get into bcm shell]
    show unit
    ps
    phy info
    port <port name>
    phy control <port-name>
    phy diag <port-name> dsc
    phy diag <port-name> pcs
    phy diag <port-name> dsc config
    phy diag <port-name> dsc (Run this command twice)
    phy diag <port-name> eyescan (This will take time and can throw timeout errors)