public Builder clearSubnetwork() {
      subnetwork_ = getDefaultInstance().getSubnetwork();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
The name of the subnetwork for the TPU node. It must be a preexisting
Google Compute Engine subnetwork. If none is provided, "default" will be
used.
</pre>

<code>string subnetwork = 2;</code>

@return This builder for chaining.
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/NetworkConfig.java