public Builder setSubnetworkBytes(com.google.protobuf.ByteString value) {
      if (value == null) {
        throw new NullPointerException();
      }
      checkByteStringIsUtf8(value);
      subnetwork_ = value;
      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>

@param value The bytes for subnetwork to set.
@return This builder for chaining.
java-tpu/proto-google-cloud-tpu-v2alpha1/src/main/java/com/google/cloud/tpu/v2alpha1/NetworkConfig.java