 2.   TCP/IP______________________________107

 Link-State Request.    .   
  ,  -  , -
,      ,   
   .

 Link-State Update.       
    .    
  LSA.      
  LSA.       
:

 Router links advertisements (RLA).    .
      , -
    .    RLA
  ,    . RLA 
  ,     .

 Network links advertisements (NLA).    .
   ,      -
 ,    , 
    .

 Summary links advertisements (SLA).    -
.     ,  
- ,     AS.  
       .
       -
 .      -
,    .

 AS external links advertisements.     AS.
 -      ,
     AS.   
 AS    AS.   -
    ,  -
     AS.    -
      .

a Link-State Acknowledgement.   . -
    .  -
      ,  -
      -
    - .

Packet Length (16 ).    ( )   
.

RouterlD (32 ).   .

ArealD (32 ).   ,   
 .