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OSPF stops exporting static route when NSSA area export is disabled

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TitleOSPF stops exporting static route when NSSA area export is disabled
Symptoms
NSSA external routes are missing.
These are to be adverised as External Type 2 routes in the backbone area.

 
Environment
Exos 15.3.5.2 patch 1-17.
Summit and Blackdiamond.
Cause

ASBR stops to redistribute static route into OSPF backbone area 0.0.0.0, when the same static route is received as an external route with same cost from another NSSA area and then it stops receiving it.

Resolution

This is identified as a software bug.

CR xos0063567 is created to track the fix for this issue.
Fix is available in the software version 15.3.5.2 patch 1-19, 16.2.5.4 patch 1-4 and above, 21.1.5.2 patch 1-6 and above.

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