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Summit X770 ports flap once following a reboot

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TitleSummit X770 ports flap once following a reboot
Symptoms
Summit X770 ports flap once following a reboot
Environment
Summit X770
Cause
Due to additional PHY programming for QSFP+ optics, there is a link flap following reboot. This is a software bug.
Resolution
EXOS has been modified to hold the link down until the additional PHY programming for QSFP+ optics takes place. This prevents the link flap from occurring.

This fix (CR xos0053091) is included in EXOS 21.1.3.7-patch1-4, as well as EXOS 22.3.1.
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