This read-only value reports the specific node which caused the PVC failure for this leaf, identifying exactly which switch in a multi-node path is responsible for the failure reported by cktLeafFailReason. Combined with the fail reason, this pinpoints not just why but where the failure occurred, which matters enormously in a multi-hop network where the failure could be at any of several intermediate nodes. An engineer troubleshooting a failed leaf across a five-node path would use cktLeafFailNode to jump straight to the responsible switch rather than checking every node in the path sequentially.