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OSPF E1 routes in NSSA area are removed/not updated properly in the routing table.

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TitleOSPF E1 routes in NSSA area are removed/not updated properly in the routing table.
Symptoms
OSPF E1 routes in NSSA area are removed/not updated properly in the routing table.
Environment
  • Summit X460-G2
  • BD switches
  • summitX-16.1.2.14-patch1-1
Cause
The issue is observed because on further disabling or re-enabling the port connected to the OSPF domain it is found that two times the device connected to OSPF sends type-7 LSA with age 3600(per disable/enable port) to the other peer. This leads to removal of the corresponding E1 route. 
Resolution
The resolution to over come this issue has two work around:
Temporary Workaround is to either refresh ospf export policy or disable/enable ospf.
Permanent workaround is to implement the CR:xos0066986 fix provided by the engineering.
Additional notes

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