Why does not an LSDB display redistributed external routes

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Perform the following steps to solve this problem:

Run the display ospf interface command to check whether the interface on which external routes are redistributed is in the Up state.
Run the display ospf brief command to check whether the router that redistributes external routes belongs to a stub area.
Check whether the external routes are learnt from neighbors and whether the neighbor relationship is in the Full state.
Check whether the lsdb-overflow-limit parameter is configured and whether the total number of external routes redistributed exceeds the configured upper limit.
Check whether the asbr-summary command is configured to summarize external routes.

Other related questions:
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.

Why cannot an OSPF route that exists in the LSDB be found in the routing table
Perform the following steps to solve this problem: Check whether the IP address is valid. Check whether the forwarding address is known and reachable. Check whether the routes are summarized or redistributed correctly. Check whether different masks or IP addresses are used in the Peer-to-peer (P2P) connection. Check whether route lists are advertised. Check whether the backbone area is disconnected. Check whether OSPF is enabled on the secondary address but not on the primary address. Parent topic: IP Routing

Why cannot an OSPF route contained in the LSDB/LSA be queried in the routing table on an S series switch
Question: Why cannot an OSPF route contained in the LSDB/LSA be queried in the routing table? Answer: Perform the following operations on the S series switch to solve the problem. Check whether the IP address is valid. Check whether the forwarding address is known and reachable. Check whether the route aggregation or route import is correct. Check whether a different mask or IP address is used in P2P connection. Check whether the advertise route list is configured. Check whether the connection with the backbone area is proper. Check whether OSPF is enabled on the secondary IP address instead of the primary IP address.

Why does the switch not select a direct route as the optimal route
By default, the switch selects routes in the following order: Longest mask > route preference > route cost When a direct route is not selected as the optimal route, check whether the switch has imported an external route with a longer mask than the direct route. If such a route exists, check whether the switch imports the more exact external route. This may be caused by incorrect routing configuration.

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