public Builder clearSubnet() {
      subnet_ = getDefaultInstance().getSubnet();
      bitField0_ = (bitField0_ & ~0x00000002);
      onChanged();
      return this;
    }
<pre>
Optional. Specifies the subnet that the interface will be part of. Network
key must be specified and the subnet must be a subnetwork of the specified
network.
</pre>

<code>string subnet = 2 [(.google.api.field_behavior) = OPTIONAL];</code>

@return This builder for chaining.
java-telcoautomation/proto-google-cloud-telcoautomation-v1/src/main/java/com/google/cloud/telcoautomation/v1/FullManagementConfig.java