Sharing  information 

To understand  how distance vector routing  works examine the  internet shown in  the  clouds represents local  area network . the  number  inside each cloud that LAN network ID>these LAN  can be  of any  type represented  by the boxes labelled A, B, C, D, E  and F,

Distance vector routing  simplifies  the  routing  process by  assuming  cost  of one  unit for every  link.

Shows the first  step in  the algorithm. The next  boxes  indicate the  relationship  of the  routers. Each  router  sends  its informant on about  internetwork only to  immediate neighbours.

A router  sends its  knowledge to its neighbours . the neighbours  add this  knowledge  to their  own  knowledge and send the whole table to their  own neighbours. In this way the first  router  gets its own information  back plus new information about its  neighbour  other neighbour . each  of these neighbours adds  its knowledge and sends the  updated table eon to its own neighbours  and so on.  Eventually every  router in internetwork.