•Paths consisting of several links are collapsed into multi-component single entities
 •Instantaneous paths:
 
 •(source
 destination route-name)
 •Delaying paths: 
 •(source destination (member routes) queue)
 •Network from
 example:
 •(sender
 receiver (out1 link in2) nil)
 •(receiver
 sender (out2 link in1) nil)