Cisco Bug: CSCvu99475 - Invalid port-resource configuration can trigger boot loop
Sep 23, 2020
- Cisco MDS 9000 Series Multilayer Switches
Known Affected Releases
Symptom: After the disruptive or non-disruptive upgrade of an MDS switch to release 8.3(1) or later from an earlier 8.x release, it is possible that the switch enters into a continuous boot loop. Messages similar to the following will be displayed: <pre> %MODULE-2-LCM_MODULE_INSERT_FAILURE_NEG_RSP: Slot-1 has failed to boot up because of service "Port manager (high)" due to module insertion failure </pre> Conditions: This issue happens only in the presence of an invalid port resource configuration. Such a configuration should have been blocked, but may have been erroneously allowed in earlier releases. 8.3(1) and later NX-OS releases will correctly block the invalid configuration if it is attempted, but if an upgrade is performed from an earlier release with such a configuration already applied, boot loop can be triggered.
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