Why imported external routes are not displayed in the LSDB on an S series switch

Perform the following operations on the S series switch to solve the problem.
Run the display ospf interface command to check whether the interface that imports external routes is in the Up state.
Run the display ospf brief command to check whether the device that imports external routes belongs to the stub area.
Check whether the neighbor status is Full if external routes are learned from a neighbor.
Check whether the lsdb-overflow-limit command is configured, and whether the total number of external routes exceeds the maximum limit.
Check whether the asbr-summary command is configured to aggregate external routes.

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