Issue

A 40GB Optical QSFP does not appear in the output of cl-sfputil, and is unable to establish a link when brought up.

Environment

• Cumulus Linux 1.5.3
• Edge-Core 5600-52X
• Optical QSFP

Root Cause

The 40 GB Optical QSFP module not being taken out of reset mode.

Diagnostic Steps

A switch may be affected by this issue if it matches the environment described above, and the following command output is observed: 

• cl-sfputil shows SFP not detected:

  root@switch:~# cl-sfputil -p swp50
  swp50: SFP not detected 
  

• Link state is state DOWN after interface is brought up:

  root@switch:~# ip link set swp50 up
  root@switch:~# ip link show swp50
  52: swp50: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT qlen 500
      link/ether 08:9e:01:ce:e4:bf brd ff:ff:ff:ff:ff:ff
  

Resolution

There are no known workarounds. This issue is being tracked in bug CM-2161, and the fix is currently targeted for the release of Cumulus Linux 2.0.

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