110  Internet

  " " ( / -
/   .)     -
. ,      
    " ". -
 " "      -
 (hello interval)     (poll interval).  -
      -
 .      -
 .

")   (Neighbor reachability).  , -
     ,  
      .  -
 ,  -   ,  -
       . 
      .

-        -
  (hello)     (i heard you). 
       -
     ,   -
      ,   -
 .   EGP     
    ,       -
    .

  (Poll).      AS,
EGP       -
.     EGP  
  ,     .  -
          
 IP (source network).    ,  
     .

   (Routing update).   -
    EGP   -
      AS.

        -
  .     (number of
interior gateways)     , -
  .     (number of exterior
gateways)     ,   -
.    IP (IP source network)  IP-
 ,    .     -
   (gateway blocks).   
  IP -    ,  
,     .