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ERS 4800: ISIS Global Routing Is Disabled After Base Unit Failover

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TitleERS 4800: ISIS Global Routing Is Disabled After Base Unit Failover
Symptoms
  • Global ISIS routing is administratively disabled after a base unit fail over.
  • Issue occurs after a stack is reformed from unit 1 being a standalone unit.
Steps to Replicate:
  1. Three unit stack. Unit 1 is the base unit.
  2. Unplug and plug power from unit 1. 
  3. Unit 2 becomes temporary base. Unit 1 rejoins stack as a non base unit. ISIS is enabled.
  4. Power is removed from unit 2, unit 3. Unit 1 remains powered on and becomes a standalone unit. ISIS is disabled. ISIS is disabled on this standalone box because a sysid/nickname duplicate condition is detected. This is the expected behavior.
  5. Unit 1, unit 2 and unit 3 are powered back on. Stack is reformed with unit 1 as base. ISIS becomes enabled.
  6. Unplug and plug power from unit 1. 
  7. Unit 2 becomes temporary base. Unit 1 rejoins stack as a non base unit. ISIS becomes disabled. This is the error state.
Environment
Ethernet Routing Switching 4800 running software 5.10.1.0, 5.12.2.0.
Cause
Issue is due to a software defect. 
Resolution
Issue will be fixed in software 5.12.3 which is forecasted to be released in the first half of April 2019. Please note that release date is tentative and may change.

Actions to alleviate impact:
Disable auto save. By disabling auto save when unit 2 becomes temp base the system will not automatically save the stack's configuration with ISIS disabled. If the configuration is not automatically saved the user can recover ISIS by rebooting the entire stack rather than having to console into the stack to re-enable ISIS.
 
Additional notes
Reference JIRA ERS454800-3045.

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