Preview Tool

Cisco Bug: CSCvu99475 - Invalid port-resource configuration can trigger boot loop

Last Modified

Sep 23, 2020

Products (1)

  • Cisco MDS 9000 Series Multilayer Switches

Known Affected Releases


Description (partial)

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:

%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 

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.
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.