Topic: cisco switch bug

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  • Cisco Switch Reboot Loop Caused by DNS Bug
    January 10, 2026
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    Cisco Switch Reboot Loop Caused by DNS Bug

    A firmware bug in Cisco switches' DNS client service is causing widespread, continuous reboot cycles by treating routine DNS lookup failures as critical errors. The issue affects multiple Cisco switch series, including the CBS250/350 and Catalyst C1200, and is triggered by attempts to resolve dom...

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Related Topics

temporary workarounds (1) affected models (1) network disruption (1) dns resolution (1) dns client errors (1) reboot loops (1) cisco support (1) global trigger (1)