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rx_fcs error or link flapping on Broadcom Network Interface Card (Doc ID 2752165.1)

Last updated on FEBRUARY 16, 2021

Applies to:

Cisco Nexus Switch - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

One or both  of the following symptoms may be observed.

Symptom1:  Excessive link flapping observed in the messages files 

Aug 1 08:56:05 dbadm01 kernel: [2066283.866070] bnxt_en 0000:af:00.0 eth3: FEC autoneg off encodings: None
Aug 1 08:56:05 dbadm01 kernel: [2066284.115241] bnxt_en 0000:af:00.0 eth3: NIC Link is Down
Aug 1 08:56:06 dbadm01 kernel: [2066284.364861] bnxt_en 0000:af:00.0 eth3: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit
Aug 1 08:56:06 dbadm01 kernel: [2066284.364864] bnxt_en 0000:af:00.0 eth3: FEC autoneg off encodings: None
Aug 1 08:56:25 dbadm01 kernel: [2066304.067813] bnxt_en 0000:af:00.0 eth3: NIC Link is Down
Aug 1 08:56:26 dbadm01 kernel: [2066304.317445] bnxt_en 0000:af:00.0 eth3: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit
Aug 1 08:56:26 dbadm01 kernel: [2066304.317449] bnxt_en 0000:af:00.0 eth3: FEC autoneg off encodings: None
Aug 1 08:56:46 dbadm01 kernel: [2066325.019584] bnxt_en 0000:af:00.0 eth3: NIC Link is Down
Aug 1 08:56:47 dbadm01 kernel: [2066325.267650] bnxt_en 0000:af:00.0 eth3: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit
Aug 1 08:56:47 dbadm01 kernel: [2066325.267653] bnxt_en 0000:af:00.0 eth3: FEC autoneg off encodings: None
Aug 1 08:56:50 dbadm01 kernel: [2066328.509695] bnxt_en 0000:af:00.0 eth3: NIC Link is Down
Aug 1 08:56:50 dbadm01 kernel: [2066328.759401] bnxt_en 0000:af:00.0 eth3: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit
Aug 1 08:56:50 dbadm01 kernel: [2066328.759404] bnxt_en 0000:af:00.0 eth3: FEC autoneg off encodings: None
Aug 1 08:56:53 dbadm01 kernel: [2066332.001416] bnxt_en 0000:af:00.0 eth3: NIC Link is Down
Aug 1 08:56:54 dbadm01 kernel: [2066332.251055] bnxt_en 0000:af:00.0 eth3: NIC Link is Up, 10000 Mbps full duplex, Flow control: ON - receive & transmit
Aug 1 08:56:54 dbadm01 kernel: [2066332.251058] bnxt_en 0000:af:00.0 eth3: FEC autoneg off encodings: None
Aug 1 08:56:54 dbadm01 kernel: [2066333.000622] bnxt_en 0000:af:00.0 eth3: NIC Link is Down

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Symptom 2: Excessive rx_fcs errors observed in the output of ethtool -S

 

Symptom 3: Attached Switchport becomes errordisable state due to link flapping up and down

Cause

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In this Document
Symptoms
Cause
Solution
References

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