OSPFv3 to OSPFv3 to support IPv6. OSPFv3

 

OSPFv3 is the modified version of OSPF that is used to support routing
in IPv6. In

OSPFv3, some basic techniques used in OSPF are still maintained. These
techniques include designated router election, flooding, shortest path first
calculation, and area support. While these basic mechanisms are still
maintained in OSPFv3, some necessary changes have also been introduced because
of the difference in protocol structure between IPv4 and IPv6. (Coltum et al,
2008). OSPF was developed by the IETF in 1987. The version now used in IPv4 is
OSPFv2. It was published in RFC 2328. OSPFv2 was later updated to OSPFv3 to
support IPv6. OSPFv3 was release in 1999 and was published in RFC 5340. OSPFv3
is a link state protocol which works by using Dijkstra’s algorithm to determine
the shortest path to a destination within a network. To determine the shortest
path to each destination, OSPFv3 first constructs a shortest path tree from the
network. The shortest path tree contains all paths

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leading to remote networks. From the shortest path tree, OSPFv3 then
selects all resulting best paths and use them to populate its routing table
(Lammle, 2007). OSPF supports hierarchical network design, enabling network
designers to separate larger networks into smaller ones called Areas.
Separating larger networks into areas minimizes the amount of routing
information that can be propagated at a time. This reduces convergence time of
the network. Also, when any fault occurs in the whole network it can be traced
to each area within the

 

Changes for
OSPFv3

 

As discussed by Teare (2010), one of the major changes introduced in
OSPFv3 is that

the protocol’s header has been redesigned. The header is no longer
complex as compared to the header in OSPFv2. The header now includes an
instance ID field. Routing in IPv6 is done on a per–interface basis not on
per–subnet. Each IPv6 routing protocol is more concerned 16 about the link on
which it is configured but not the subnet. The addition of the new instance ID
field to the protocol structure therefore makes it possible for several OSPFv3
instances or addresses to be enabled on the same link. By default, instance ID
is 0. When there is an additional instance, it is increased. Each OSPF instance
is assigned a separate instance ID.

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