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Cisco Bug: CSCvu11868 - "Link not connected" error after reboot when using QSFP-40G-LR4 transceiver on FPR9K-NM-4X40G

Last Modified

Aug 12, 2020

Products (1)

  • Cisco Firepower 9300 Series

Known Affected Releases


Description (partial)

The FP9300 40Gbps interface will display down/down.
The adjacent switch will display "Link not connected" if errordisable detection is disabled.

This is a rare interoperability issue that requires the following to all be TRUE in order to encounter this issue:

1. The FPR9300 must be using an interface on an FPR9K-NM-4X40G network module
2. The FPR9300 Interface must be using the QSFP-40G-LR4 transceiver
3. The connected peer must be a Cisco N9K-C93180LC-EX 
4. The connected peer port must be in the lower 28 port range (i.e. port 0-27).  Upper range ports are not affected.
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Bug Details Include

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