Thursday, 8 September 2016

Open Shortest Path First - Part 1

Open Shortest Path First (OSPF)

1.) It is link state protocol, which elect best way from source to destination base on highest bandwidth.
2.) It support both FLSM and VLSM subnetting.
3.) Every ospf router interface work in single area, which represent in area-id.
4.) It use Dijkstra algorithm.
5.) OSPF is fast convergency protocol as camper to eigrp.
6.) It support unlimited hope count.
7.) It also use PID (process ID) number for identification of each ospf process.
8.) It use wildcard mask for network adjacency.


9.) OSPF Router:
       In OSPF environment following  router work:

       A.) Designated Router (DR) :
              Every single area have DR, the router that keeps the highest database for the subnet, it
                 became DR.
       B.) Backup Designated Router (BDR) :
              Which router have second highest ip address, became BDR.

       C.) Area Border Router (ABR) :
              This types of router have entry of multiple areas. Its one interface connected with the area 0
               (Backbone Area) and another is with different area.

       D.) Autonomous System Border Router (ASBR) :
              It is placed on ISP. It is use to create connection between multiple different areas. It always
              represent area 0.
              Note: Area 0 (Backbone area) is must be require to create connection different multiple

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