Distance vector routing

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  • Most routing protocols fall into one of two classes: distance vector or link state. The basics of distance vector routing protocols are examined here; the next section covers link state routing protocols. Most distance vector algorithms are based on the work done of R. E. Bellman, L. R. Ford, and D. R. Fulkerson, and for this reason occasionally are referred to as BellmanFord or FordFulkerson algorithms. A notable exception is EIGRP, which is based on an algorithm developed by J. J. Garcia Luna Aceves....

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  • Upon completing this lesson, you will be able to: Describe the features offered by distance vector routing protocols and give examples of each Describe the issues associated with distance vector routing and identify solutions to those issues

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  • The following will be discussed in this chapter: Identify the characteristics of distance vector routing protocols, describe the network discovery process of distance vector routing protocols using Routing Information Protocol (RIP), describe the processes to maintain accurate routing tables used by distance vector routing protocols,...

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  • Objectives: Identify the characteristics of distance vector routing protocols. Describe the network discovery process of distance vector routing protocols using Routing Information Protocol (RIP). Describe the processes to maintain accurate routing tables used by distance vector routing protocols.

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  • In this chapter: Identify the characteristics of distance vector routing protocols, describe the network discovery process of distance vector routing protocols using Routing Information Protocol (RIP), describe the processes to maintain accurate routing tables used by distance vector routing protocols,...

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  • Trước khi network 1 bị down thì thì tất cả router đều xem đường route tới network là tốt. Router C nhận định rằng muốn tới network 1 thì fải qua router B với metric là 3 (ví dụ ta chạy RIP).

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  • Identify the characteristics of distance vector routing p y g protocols. Describe the network discovery process of distance vector routing protocols using Routing Information Protocol (RIP). Describe the processes to maintain accurate routing tables used by distance vector routing protocols. Identify the Id tif th conditions l di t a routing l diti leading to ti loop and explain th d l i the implications for router performance.

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  • Bài 3 giới thiệu giao thức định tuyến distance-vector. Sau khi học xong bài học này người học có thể: Nhận biết biết được các giao thức định tuyến Distance Vector Routing Protocol; giải thích thích được đặc điểm và cách RIPv1/RIPv2 hoạt động; trình bày bày được đặc điểm, thuật toán DUAL sử dụng trong giao thức định tuyến EIGRP; cấu hình hình được các giao thức định tuyến RIPv1/RIPv2/EIGRP.

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  • Link-State Routing Protocols. Objectives: Describe the basic features & concepts of link-state p routing protocols. Distance vector routing protocols are like road signs because routers must make preferred path decisions based on a distance or metric to a network. Link-state routing protocols are more like a road map because they create a topological map of the network and each router uses this map to determine the shortest path to each network. The ultimate objective is that every router receives all of the link-state information about all other routers in the routing area.

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  • Small frequently issued packets Discover neighbours and negotiate "adjacencies" Verify continued availability of adjacent neighbours Hello packets and Link State Advertisements (LSAs) build and maintain the topological database Hello packets are addressed to 224.0.0.5.

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  • Enhanced Interior Gateway Routing Protocol (EIGRP)  Distance vector.  Classless routing protocol.  Released in 1992 with Cisco IOS Software Release 9.21.  Enhancement of Cisco Interior Gateway Routing Protocol (IGRP).  Both are Cisco proprietary.  Operate only on Cisco routers.The term hybrid routing protocol is sometimes used to define EIGRP.  Misleading, not a hybrid between distance vector and link-state  Solely a distance vector routing protocol.

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  • There are advantages and disadvantages to using any type of routing protocol.  Some of their inherent pitfalls, and.  Remedies to these pitfalls.  Understanding the operation of distance vector routing is critical to enabling, verifying, and troubleshooting these protocols.RIP: Routing Information Protocol originally specified in RFC 1058.  Metric: Hop count  Hop count greater than 15 means network is unreachable.  Routing updates: Broadcast/multicast every 30 seconds

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  • Distance Vector Routing Protocols Objectives: Identify the characteristics of distance vector routing p y g protocols. Describe the network discovery process of distance vector routing protocols using Routing Information Protocol (RIP). Describe the processes to maintain accurate routing tables used by distance vector routing protocols. Identify the Id tif th conditions l di t a routing l diti leading to ti loop and explain th d l i the implications for router performance. Recognize that distance vector routing protocols are in use today. ...

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  • Distance vector routing protocols are like road signs because routers must make preferred path decisions based on a distance or metric to a network. – Link-state routing protocols are more like a road map because they create a topological map of the network and each router uses this map to determine the shortest path to each network. – The ultimate objective is that every router receives all of the link-state information about all other routers in the routing area.

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  • Identify the characteristics of distance vector routing p y g protocols. Describe the network discovery process of distance vector routing protocols using Routing Information Protocol (RIP). Describe the processes to maintain accurate routing tables used by distance vector routing protocols.

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  • Xác định các đặc tính của giao thức định tuyến vector khoảng cách. Mô tả quá trình khám phá mạng lưới giao thức định tuyến vector khoảng cách sử dụng giao thức thông tin định tuyến ( RIP ). Mô tả các quá trình để duy trì các bảng định tuyến chính xác được sử dụng bởi các giao thức định tuyến vector khoảng cách. Xác định các điều kiện dẫn đến một vòng lặp định tuyến và giải thích ý nghĩa đối với routerperformance.

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  • This chapter covers an overview of routing, including how to set up static routes and how dynamic routing protocols—distance vector, link state, and hybrid protocols— function. Chapter 10 covers the configuration of two distance vector routing protocols, and Chapter 11 covers the configuration of a link state routing protocol and a hybrid routing protocol.

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  • In the preceding chapter, you gained an overview of routing protocols, including the different types and their advantages and disadvantages. This chapter covers the basic configuration of distance vector protocols, specifically the IP Routing Information Protocol (RIP) and the Interior Gateway Routing Protocol (IGRP). It focuses on the basics of these protocols; advanced configuration of these protocols is beyond the scope of this book. However, by the end of the chapter, you’ll be able to configure routers running RIP and IGRP that will route traffic in a network....

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  • Traditional Distance Vector Routing Protocols. • Use the Bellman-Ford or Ford-Fulkerson algorithm. • Age out routing entries and uses periodic updates. • Keep track of only the best routes; the best path to a destination network. • When a route becomes unavailable, the router must wait for a new routing update. • Slower convergence due to holddown timers.

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  • Objectives: Describe the basic features of EIGRP. Scenario: EIGRP was introduced as a Distance-Vector routing protocol in 1992. It was originally designed to work as a proprietary protocol on Cisco devices only.

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