code: func (n *Network) OrdererPort(o *Orderer, portName PortName) uint16 {
  	ordererPorts := n.PortsByOrdererID[o.ID()]
  	Expect(ordererPorts).NotTo(BeNil())
  	return ordererPorts[portName]
  }
docs: // OrdererPort returns the named port reserved for the Orderer instance.