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OSPF AS external routes are removed when one of the two paths go down out of which one is inter area path and another is intra area path.

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TitleOSPF AS external routes are removed when one of the two paths go down out of which one is inter area path and another is intra area path.
Symptoms
OSPF AS external routes are removed when one of the two paths go down out of which one is inter area path and another is intra area path.
ASBR is reachable through both an intra-area backbone path and an inter-area path.  The inter-area path ends up being the preferred path and when the summary asbr lsa for this path is flushed, the external routes are removed.
Environment
  • EXOS 16.1 and higher
  • OSPF
Cause
The issue is documented and fixed under CR xos0076593.
Resolution
Upgrade EXOS to a version that includes the the fix for xos0076593.
Target Releases:    
EXOS 22.7.1.2-patch1-15
EXOS 30.5.1
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