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Cisco Bug: CSCvu75772 - Switch may see Link Flaps with SFPs that don't squelch the RX Data Signal AND no cable connected

Last Modified

Sep 03, 2020

Products (1)

  • Cisco Industrial Ethernet 4000 Series Switches

Known Affected Releases

15.2(4)E

Description (partial)

Symptom:
interface starts to flap without any fiber cable connection to the transceiver that is plugged into Fa1/6 , for example when GLC-FE-100FX is inserted. When a cable is inserted and port is shut/no shut to come out of err-disable state, no problem is seen.

In future refer CSCvv47621 for  bug commit

Conditions:
SFPs that don't squelch  RX-LOS data signal AND with no cable connection. Problem may not happen until neighboring ports are also inserted with other sfps.
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