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Cisco Bug: CSCvv99136 - Link does not come up if IOS version differs and FEC option is on

Last Modified

Oct 14, 2020

Products (1)

  • Cisco Catalyst 9500H Series Switches

Known Affected Releases

16.12.4 16.9.6

Description (partial)

1. Interface status is down/down, Optical power Tx/Rx is OK
2. Shutdown / no shutdown does not resolve the issue, neither reload.
3. Replacing the transceiver SFP-25G-SR-S slot - no changes. Interface down/down status.

1. C9500-24Y4C-A
2. 25G connection between two Cat9500 switches with SFP-25G-SR-S transceivers on both ends.
3. IOS version: 16.9.3; 16.9.6; 16.12.4
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