Since you can summarize at any interface: it reduces the amount of update traffic, it reduces the length of routing tables, and sets boundaries for queries.īounding queries is an important consideration.
Which has proven most idea for multi levels of hierarchy because of the ability to summarize at any router interface.
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It uses an algorithm called DUAL (Diffuning Update Algorithm) to calculate a loop free path to each network. EIGRP was developed to be used with any media and network topology. This lack of scalability means that a link state routing protocol is unsuitable for routing across the Internet at large, and is also reason why Imps only route traffic within a single AS.Įnhanced Interior Gateway Protocol (EIGRP), a Cisco proprietary routing protocol, evolved from the evolution of its predecessor IGRP. This creates a very large OSPF database, using a large amount of memory, which would adversely affect the network integrity. By adding more routers increases the size and frequency of the topology updates, and also the length of time it takes to calculate end-to-end routes. The main disadvantage of a link state protocol is that it does not scale well as more routers are added to the routing domain. Which can be useful for traffic engineering purposes where routes can be manipulated to meet different service requirements. The main advantage of link state routing (OSPF) is that complete knowledge of topology allows routers to calculate routes that satisfy the incoming request. Tagged routes – Routes can be tagged with arbitrary values, easing interoperation. TOS routing – OSPF can route packets by different criterion based on their type of service field Hello packets – OSPF uses small hello packets to verify link operation with out transferring large tables Scalability – OSPF is specifically designed to operate with larger networks.įull subnetting support – OSPF can fully support subnetting OSPF was mentioned having many new features, but noted are: The SPF algorithm uses this metric to build a tree containing the shortest or “least cost” path to each network. OSPF adds the cost of each link along the path to the destination network. Djikstra states that OSPF’s metric is cost on Cisco routers cost is based on bandwidth the default value is 10 to the 8 th power divided by interface bandwidth. Open Shortest Path First (OSPF) is an interior gateway routing protocol developed for IP networks based on the shortest path first or link-state algorithm originated by Edgars Djikstra.
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