________________________
    _______       (                        )       _______
   (       )     (        IP Network        )     (       )
  ( SR-MPLS )   (                            )   ( SR-MPLS )
 (  Network  ) (                              ) (  Network  )
(         --------                          --------         )
(        | Border |    SR-in-UDP Tunnel    | Border |        )
(        | Router |========================| Router |        )
(        |   R1   |                        |   R2   |        )
(         --------                          --------         )
 (           ) (                              ) (           )
  (         )   (                            )   (         )
   (_______)     (                          )     (_______)
                  (________________________)