Ospf Scenario - NetComm NTC-400 Series User Manual

source to a destination. The maximum number of hops allowed for RIP is 15. This hop limit, however, also limits the size of
networks that RIP can support. A hop count of 16 is considered an infinite distance. In other words, the route is considered
unreachable. RIP implements the split horizon, route poisoning and hold-down mechanisms to prevent incorrect routing
information from being propagated.
Figure 166 – RIP Scenario
3.6.2.2

OSPF Scenario

Open Shortest Path First (OSPF) is a routing protocol that uses the link state routing algorithm. It is the most widely used
interior gateway protocol (IGP) in large enterprise networks. It gathers link state information from available routers and
constructs a topology map of the network. The topology is presented as a routing table which routes datagrams based solely
on the destination IP address.
The Network administrator can deploy an OSPF gateway in a large enterprise network to get its routing table from the
enterprise backbone, and forward routing information to other routers, which are not linked to the enterprise backbone.
Usually, an OSPF network is subdivided into routing areas to simplify administration and optimise traffic and resource
utilization.
In the diagram below, the OSPF router gathers routing information from the backbone gateways in area 0, and will forward
its routing information to the routers in area 1 and area 2 which are not in the backbone.
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