4.3.             297

    

         Token
Ring  FDDI,          .
   (Source Routing, SR)   ,  -
          -
     ,     
,    ,    -.  
     ,  -
       ,     
-        -
,         - -
     .

    Source Routing ( , SR-)
  ,   . 4.21.     , -
  .        -
. SR-    ,     
,      .

		  ; SBR	F	
 1				 2
  < 				  < /
				

 
 SBRF

. 4.21.   Source Routing

    SR-     -
  ( Routing Information Field, RIF,   Token Ring 
FDDI)       .     -
    ,    -
 ,           .
        .    
      -,   
    ,    ( )    ( -
)      1,   --
,       (     
 ).

        ,    
  ,    ,    
 RIF    1  /  (I/G)
(       ,    
 ).

 RIF   ,    .