Fix for “%ADJ-5-RESOLVE_REQ_FAIL: Adj resolve request failed for (IP)”

Some high-security devices that don’t respond to ping triggered the following:

%ADJ-5-RESOLVE_REQ_FAIL: Adj resolve request failed for 192.168.1.1 on GigabitEthernet1/0/1

Cisco advised me that these are not an issue, and can be safely disabled with:

no ip cef optimize neighbor resolution

This apparently used to be disabled by default, but has since been enabled.
Sauce

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