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  • Hirofumi Takahashi thinks this is interesting:

Certain conditions must be met before a static route is written into the route table. IP routing must be enabled, the next-hop address, if used, must be reachable, the exit interface must have an IP address configured on it, and the exit interface must be up.

From

Cover of Routing TCP/IP, Volume 1, 2/e

Note

Conditions for Static Route to appear in the route table