code: func (client *cniClient) createBridgeNetworkConfigWithIPAM(cfg *Config) (string, *libcni.NetworkConfig, error) {
  	// Create the bridge config first
  	bridgeConfig := client.createBridgeConfig(cfg)
  
  	// Create the ipam config
  	ipamConfig, err := client.createIPAMConfig(cfg)
  	if err != nil {
  		return "", nil, errors.Wrap(err, "createBridgeNetworkConfigWithIPAM: create ipam configuration failed")
  	}
  
  	bridgeConfig.IPAM = ipamConfig
  
  	networkConfig, err := client.constructNetworkConfig(bridgeConfig, ECSBridgePluginName)
  	if err != nil {
  		return "", nil, errors.Wrap(err, "createBridgeNetworkConfigWithIPAM: construct bridge and ipam network configuration failed")
  	}
  	return defaultVethName, networkConfig, nil
  }
docs: // createBridgeNetworkConfigWithIPAM creates the config of bridge for ADD command, where
  // bridge plugin acquires the IP and route information from IPAM