31.2.2.0.3 Class NetworkInterface

This is a simple connector that is placed on each link. It affixes its label id to each packet that traverses it. The packet id is used by the destination node incident on that link to identify the link by which the packet reached it. The label id is configured by the Link constructor. This object is an internal object, and is not designed to be manipulated by user level simulation scripts. The object only supports two methods: rX [ifid]label & assigns ifid that this object will affix to each packet.
[]label & returns the label that this object affixes to each packet.
The global class variable, ifacenum
_, specifies the next available ifid number.