Tuesday, 20 September 2016

OSPF - Part 5

OSPF Network Types

1.) Point-to-Point Network

    It indicate the topology where two router are directly connected.

   A point-to-point network is, exactly two point (router).
  •  No DRs and BDRs
  • OSPF traffic sent on
  • Neighbors do not need to manually specified.

2.)  Broadcast  Network 
      Ethernet network support broadcast: a single packet transmitted by a device can be multiple by
      the medium. So that every other end point receive  a copy.


3.)  Non - Broadcast

Frame - relay  and ATM are probably the most common examples of non-broadcast transport.
On the following scenario R1 must craft and transmit an individual packet for every destination he wants to reach.
   OSPF can operate in one of two modes of non-broadcast network:

     A.)  Non-broadcast multi-access  (NBMA)
            An NBMA segment emulates the function of broadcast network. Every router on the segment
           must be configured with the IP address of each of its neighbors. OSPF hello packets are then
           individually transmitted as unicast packet to each adjacent neighbor.

    B.) Point-to-Multiple
            A point-to-multiple configuration approaches the non-broadcast limitation in a different
            manner. Rather than trying to emulate broadcast capability, it seeks to organize the PVCs
           into a collection of point to point network.

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