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ERS4900/5900 - 10GB-SR fiber link UP but no traffic

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TitleERS4900/5900 - 10GB-SR fiber link UP but no traffic
Symptoms
The ERS4900/5900 working in the Stack. Some fiber ports, x/49-50,  are in the status UP but traffic seems to not be received. 

Under port statistics, we can find FCS errors are increasing on the link:
#show port-statistics port 1/50
Unit: 1  Port: 50
------------------

Received

    Packets:                 3677
    Multicasts:              3556
    Broadcasts:              0
    Total Octets:            583197
    Packets 64 bytes:        9
            65-127 bytes:    2286
            128-255 bytes:   1035
            256-511 bytes:   239
            512-1023 bytes:  108
            1024-1518 bytes: 0
            1519-2047 bytes: 0
            2048-4095 bytes: 0
            4096-9216 bytes: 0
    Total Jumbo 1519-9216:   0
    Control Packets:         0
    FCS Errors:              120
Environment
  • ERS4900/5900
  • Software version 7.5 and higher
Cause
The issue is under the process of being investigated. 
Resolution
Switch reboot is a valid workaround. 
Additional notes

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