Symptom
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"clear ospf process vrf all" does not work as designed. When answer the prompt "Reset all VRFs in OSPF process? [no]:", answer "yes" only clear ospf process for first VRF. And the same prompt is displayed again and answer "yes" again clear the ospf process for the second VRF and so on. Basically, we don't have a command to clear ospf processes for all VRFs
Workaround
Clear individual VRF with "clear ospf process vrf " works correctly and the user can reset each OSPF process one by one. Or the user can use "clear ospf process vrf all" and answer "yes" for each prompt till all VRFs OSPF process is reset.