Netgear XCM8810 Chassis User Manual - Page 662
RIP Versus OSPF, Advantages of RIP and OSPF, OSPF
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NETGEAR 8800 User Manual OSPF is a link-state protocol based on the Dijkstra link-state algorithm. OSPF is a newer IGP and solves a number of problems associated with using RIP on today's complex networks. Note: RIP can be enabled on a VLAN with OSPF. RIP is described in this chapter, and OSPF is described in Chapter 24, OSPF. RIP Versus OSPF The distinction between RIP and the OSPF link-state protocols lies in the fundamental differences between distance-vector protocols and link-state protocols. Using a distance-vector protocol, each router creates a unique routing table from summarized information obtained from neighboring routers. Using a link-state protocol, every router maintains an identical routing table created from information obtained from all routers in the autonomous system (AS). Each router builds a shortest path tree, using itself as the root. The link-state protocol ensures that updates sent to neighboring routers are acknowledged by the neighbors, verifying that all routers have a consistent network map. Advantages of RIP and OSPF The biggest advantage of using RIP is that it is relatively simple to understand and to implement, and it has been the de facto routing standard for many years. RIP has a number of limitations that can cause problems in large networks, including the following: • A limit of 15 hops between the source and destination networks • A large amount of bandwidth taken up by periodic broadcasts of the entire routing table • Slow convergence • Routing decisions based on hop count; no concept of link costs or delay • Flat networks; no concept of areas or boundaries OSPF offers many advantages over RIP, including the following: • No limitation on hop count • Route updates multicast only when changes occur • Faster convergence • Support for load balancing to multiple routers based on the actual cost of the link • Support for hierarchical topologies where the network is divided into areas The details of RIP are explained later in this chapter. 662 | Chapter 22. RIP
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