code: func (client *cniClient) createBridgeNetworkConfigWithoutIPAM(cfg *Config) (string, *libcni.NetworkConfig, error) {
  	networkConfig, err := client.constructNetworkConfig(client.createBridgeConfig(cfg), ECSBridgePluginName)
  	if err != nil {
  		return "", nil, errors.Wrap(err, "createBridgeNetworkConfigWithoutIPAM: construct bridge network configuration failed")
  	}
  	return defaultVethName, networkConfig, nil
  }
docs: // createBridgeNetworkConfigWithoutIPAM creates the config of the bridge for removal