Description

In rare occurrences, few of the interfaces, on the QFX5200-32C-32Q device, do not come up post OS upgrade or a power drain. Below is the output of one such interface where a working QSFP is installed, however it is not detected in <show chassis hardware> or <show interface terse> output.

lab@qfx> show interfaces et-0/0/0
error: device et-0/0/0 not found

The interfaces are not channelized and there is no other config on the interfaces.

Similar issue is sometimes seen on QFX10002 devices as well.

Symptoms

Below are example syslogs printed in vty fpc0 prompt.


FPC0(qfx vty)# show syslog messages
Aug 28 15:30:32 qfx fpc0 qsfp_tk_get_status_indicator: qsfp-0/0/0 failed to read status byte (addr 2). Err 1000 
Aug 28 15:30:32 qfx fpc0 qsfp_tk_read_mem_page: qsfp-0/0/0 failed to select addr 127 err 1000 
Aug 28 15:30:32 qfx fpc0 qsfp-0/0/0: I2C access failures exceeded 10 times, disable periodic. Please re-insert or replace the optics 

Solution

Capture the below CLI command outputs to get more insights into the issue.

request pfe execute target fpc0 command "show qsfp list" <<<< get the qsfp ID here
request pfe execute target fpc0 command "show qsfp <id> info"
request pfe execute target fpc0 command "show qspf <id> identifier"
request pfe execute target fpc0 command "show qspf <id> alarms"
request pfe execute target fpc0 command "show qsfp <id> diagnostics"
request pfe execute target fpc0 command "show qspf <id> i2_accel_err" 


If the QSFP is not listed in the above output, check the log messages from the below output.

request pfe execute target fpc0 command "show syslog messages"

1. Try to reseat the optics and check if that helps resolve the issue.

2. Based on the PFE syslogs, if the PFE is not initialized or the interfaces are not detected after a failed upgrade, you can try to do a Junos recovery using KB36947 [juniper.net].

3. If the issue persists post a power drain or junos recovery, then the issue could be with the internal memory and we need to replace the faulty hardware. In case of QFX10002, check for fabric or FPC alarms on these devices. Contact JTAC for further assistance

Modification History

2023-09-03 - Initial Publication
2023-09-10 - Listed QFX10k where similar issue is seen
​​​​​​​2024-07-29 - Visibility modified