How Adding Response Headers or Faults Affect In-Only MEP Operations
If you have an In-Only MEP operation, the MEP type changes if you add a response header or a fault to the operation.
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If you add a response header to an In-Only MEP operation, the MEP changes to In-Out MEP.
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If you add a fault to an In-Only MEP operation, the MEP changes to Robust In-Only MEP.