Run the display isis lsdb verbose command to view all the routes, and search for the target IP address to view the source for a route.
For example, the source for the target IP address 120.192.197.0 is to be located. Run this command to search for this address in the command output. If this address matches the IP address 2182.0003.1212, the source is 218.200.31.212.


In addition, you can run the display isis table-name command to check the device names if mappings between the device name and system ID are configured.

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