AN Lesson-16

Configuring and Managing Routing Protocols-I

RIP

•            RIP is a dynamic routing protocol that helps routers determine the best path through which to send given data.

•             RIP discards routes that are determined to have a cost higher than 15. This feature effectively limits the size of the network in which RIP can operate. Another important feature of RIP is that RIP-enabled routers advertise their entire routing tables to each other every 30 seconds. The service therefore generates a substantial amount of network traffic.

RIP Environment

A RIP routed environment is best suited to a small-to-medium-sized, multipath, dynamic IP internetwork:

■ A small-to-medium-sized internetwork is defined as 10 to 50 networks. In addition, the diameter of a RIP network cannot exceed 15 routers.

■ Multipath means that multiple paths are available for packets to travel between any two endpoints on the internetwork.

■ Dynamic means that the topology of the internetwork changes over time.

Advantages of RIP

The main advantage of RIP is that it is easy to deploy. You can implement it on your network simply by enabling the protocol on each router.

Disadvantages of RIP

RIP does not scale well to large networks because of the 15-hop limitation. Other disadvantages of RIP include its high convergence times in medium-sized networks

OSPF

• OSPF is designed for exchanging routing information within a large or very large internetwork.
• OSPF requires little network overhead even in very large internetworks.
• OSPF uses a Shortest Path First (SPF) algorithm to compute routes in the routing table. The SPF algorithm computes the shortest (least cost) path between the router and all the networks of the internetwork.
• Instead of exchanging routing table entries like RIP routers, OSPF routers maintain a map of the internetwork that is updated after any change to the network topology.
• This map, called the link state database, is synchronized between all the OSPF routers and is used to compute the routes in the routing table.

Advantages

• Scale to large or very large internetworks.
•  No hop limit with faster convergence time.
•  It uses less network bandwidth for network update.
• Calculates by tree tree routes.

Disadvantages

• Complex to deploy.
• Difficult to configure or administer.

RIP vs OSPF

RIP is dynamic routing protocol i.e is east to deploy but resource intensive and unsuitable for large networks.

            OSPF is dynamic routing protocol i.e difficult to deploy but scalable,smart and efficient for any kind of network.