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@@ -165,10 +165,47 @@
      is  to be turned off. A process may ignore all messages from
      the routing socket by doing a  shutdown(3SOCKET) system call
      for further input.
 
 
+     By  default, underlying IP interfaces  in  an IPMP group are
+     not visible  to  routing sockets.  As  such, routing sockets
+     will not receive events related  to underlying IP interfaces
+     in an IPMP group.  For consistency,  when an IP interface is
+     placed into an IPMP   group, *RTM_DELADDR* messages  will be
+     generated for each  of the *IFF_UP*  addresses that are  not
+     migrated to the    corresponding IPMP IP interface,   and an
+     *RTM_IFINFO*  message will    be  sent indicating that   the
+     interface  is   now down.    Similarly, when   an underlying
+     interface is removed   from an IPMP   group, an *RTM_IFINFO*
+     message will be sent indicating  that the interface is again
+     up, and *RTM_NEWADDR*  messages will  be generated for  each
+     *IFF_UP* address found on the interface.
+
+
+     The *RT_AWARE* socket option at the *SOL_ROUTE* level allows
+     an application    to  indicate  its  awareness   of  certain
+     features, which  controls  routing   socket  behavior.   The
+     supported values are:
+
+        *RTAW_DEFAULT*    Default awareness.
+
+        *RTAW_UNDER_IPMP* IPMP  underlying  interface  awareness.
+                          When  this is  enabled, underlying   IP
+                          interfaces in an IPMP group will remain
+                          visible to     the routing  socket  and
+                          events related to them will continue to
+                          be generated.
+
+
+     An *RTM_ADD* request tied  to an underlying IP  interface in
+     an IPMP group will be translated to an *RTM_ADD* request for
+     its corresponding  IPMP IP  interface.   All routing  socket
+     requests other than  *RTM_ADD* and *RTM_GET* will  fail when
+     issued on an underlying IP interface in an IPMP group.
+
+
      If a route is in use when it is deleted, the  routing  entry
      is  marked  down and removed from the routing table, but the
      resources associated with it are  not  reclaimed  until  all
      references to it are released.