ANR

from The Free On-line Dictionary of Computing (8 July 2008)

Automatic Network Routing
ANR

   <protocol> (ANR) A {source routing protocol} used to route
   {LU6.2} session and control traffic from {node} to node
   through a {High Performance Routing} network or {subnet}.  ANR
   operates at the lower end of the {SNA} {Path Control layer}.

   [Relationship to {OS/390}?]

   (1997-05-08)