This paper is an introduction to the interior gateway routing protocol igrp suite of routing protocols designed and developed by cisco systems. When the connectoin drops, they have static routes pointing to the t1s. Loadthis is a measure of the utilization of the interface. Ill show you the configurations of eigrpcause remember eigrp is for a medium sizeto large enterprise networks. Eigrp adheres to the following hybrid characteristics. Eigrp has a few methods to disseminate the default route. Sr technical university,avadi 2 assistant professor, dept.
Its just that youre limited to those particular routers. Configuring basic eigrp eigrp is an extremely common routing protocol due to its simplicity and ease of configuration. In this update i will explore how to merge an existing ospf network with an existing eigrp network and also touch on some other subjects which you can read about in the objectives below. It is not considered in the eigrp metric calculation by default, but you can include it into the metric calculation by changing the default values more about that later. Redistribution between cisco eigrp into ospf and vice. Contents chapter 1 readmefirst 1 chapter 2 eigrp 3 findingfeatureinformation 3 informationaboutconfiguringeigrp 3 eigrpfeatures 3 eigrpautonomoussystemconfiguration 4. No, routes from different routing protocols are compared using administrative distance, not the metric. When the connections are up, they have routes directly through the fiber.
Les caracteristiques du protocole eigrp sont les suivantes. However, we have not configured redistribution yet. Also, eigrp is responsible for redistributing routes learned by other ip routing protocols. Basic cisco router eigrp configuration select the contributor at the end of the page this article is the third in a series of articles covering the basics of cisco networking. Now we have to remember the other aspect of the network command. Eigrp for ip is a concise, complete, and practical guide to understanding and working with eigrp.
Enhanced interior gateway routing protocol eigrp is an advanced distance vector routing protocol based on the principles of the interior gateway routing protocol igrp. Two seperate eigrp groups, and static routes for the other sites through the t1 routers, with a hop count of 254. Eigrp explained enhanced interior gateway routing protocol. To enable eigrp on a router you use its router command router eigrp. Eigrp cheat sheet successor primary route to a destination. Eigrp is a successor to the interior gateway routing protocol igrp. Interior gateway protocol routage avancees enhanced interior. Instructor another key concept for the ccnp testas well as most modern networks is default routing. By including that interface in the process, you are making it part of the autonomous system. This router is the junction between the two networks and runs both ospf and eigrp.
Eigrp configuration with example stepbystep icnd2 200105. In any case, having a multiple routing protocol and different autonomous system in networks then without route redistribution. Eigrp metric weights eigrp uses the minimum bandwidth on the path to a destination network and the total delay to compute routing metrics. C connected, s static, i igrp, r rip, m mobile, b bgp.
After static routing configuration, and dynamice routing configuration we are going to introduce hybrid routing configuration here now. And now we can configure ospf redistribution into our eigrp network on r3 with the router process command redistribute ospf 10. Introduction this document describes the enhanced interior gateway routing protocol eigrp, a routing protocol designed and developed by cisco systems, inc. Unlike eigrp automatic summarization, eigrp manual route summarization is configured and implemented at the interface level using the ip summaryaddress eigrp asn network mask distance leakmap interface configuration command. Lets setup eigrp on our branch router and our hq router. Eigrp general hybrid rputing protocol uses dual algorithm protocol independant classless routing protocol support equal unequal path load balancing eigrp tables neighbor table topology table routing table eigrp routing table terms active state router is trying to find a route. Eigrp is activated on a router by entering configuration mode and the eigrp command. Eigrp equal and unequal cost load sharing posted by admin on 19 september 2011, 11. Eigrp troubleshooting eigrp routing table icnd2 200105. Survey on the rip, ospf, eigrp routing protocols v. Eigrp requires an autonomous system number because that is how it determines what routers belong to the same eigrp routing domain. For example a router with an eigrp as of 1 and another with an as of 150 will not form adjacency they will simply ignore each other. Keep in mind that the as number has to match on eigrp routers in order to become neighbors. Eigrp has several advantages over routing information protocol rip and interior gateway routing protocol igrp, and even some advantages over open shortest path first ospf and.
Basic cisco router eigrp configuration pluralsight. Enhanced interior gateway routing protocol eigrp a routing protocol owned by cisco that works on routers and the internal route processors contained in the core layer switches and distribution layer switches cisco. You should also set the defaultmetric with the command defaultmetric 0 100 255 1 1500 or your routes will not be redistributed properly. Advertised distance cost between next hop and a destnation. If you look at the red fonts you can see that we are looking at the eigrp topology table for as autonomous system number 1. Eigrp shares some basic features with igrp, for example, the use of composite metrics, maximum number of next hops and support for multiple network protocols 2. Eigrp as123 has been preconfigured for you and is advertising all networks. Of computer science and engineering pune institute of computer technology, pune. You are not allowed to use eigrp autosummarization. Therefore, its routing table contains the routes from both networks.
And lets ensure that hq has the ability to route to the 10. Both are owned by cisco and operate only on their devices. Most networks cant supportand have no need for the full internet route table,instead they rely on a single default routeto reach the internet. In this lab, you will configure eigrp for the topology and networks shown above. Multiple eigrp as on the same router solutions experts. The first method is via static routein conjunction with. Adaptive cutthrough il combine les modes storeandforward et cutthrough. This type of routing is allowed for rapid convergence but consume. Understanding the eigrp best path selection intense school. It focuses on eigrp in the context of ip, although the principles learned from this guide can be applied to the other major network protocols that eigrp supports, including ipx and appletalk. If you are unfamiliar with distance vector and rip i highly recommend to read my introduction to rip first before continuing eigrp stands for enhanced interior gateway routing protocol and is a routing protocol created by cisco. In this lesson, well take a look at eigrp enhanced interior gateway routing protocol which is ciscos routing protocol.
Eigrp overview eigrp is a cisco proprietary routing protocol loosely based on their original igrp interior routing protocol. Pdf eigrp a fast routing protocol based on distance. Ensure router cole and santiago only have a single 172. By default, eigrp uses only up to 50% of an interfaces bandwidth for eigrp information, which prevents the eigrp process from overutilizing a link and not allowing enough bandwidth for the routing of normal traffic. The only thing with eigrp, that its cisco proprietarymeaning you can only use it on cisco routers. Ospf est desormais mis en oeuvre sur toutes les plateformes. This paper should be used as an informationonly document intended as a technology introduction and does not represent a protocol specification or product description. Developing computer network based on eigrp performance. This lab will discuss and demonstrate the configuration and verification of the cisco eigrp dynamic routing protocol. All right, as you can see, we have herea brand new topology. Il converge tres rapidement et il est multiprotocoles ipv4ipv6. Company a has bought company b and must merge its network into its own. We will use rip and eigrp together and merge them to get the benefits of distance vector and link state.
If the eigrp routes are better than other dyn protocols, static, connected and are placed in the routing table as the best routes yes, as numbers does not give preference. One of the great unique features eigrp brings to the table is the ability to loadbalance traffic across unequal links. Articulate the leader in rapid elearning and communications. Eigrp converges very quickly, it takes about the same time or not less than ospf takes to converge, but without the negatives of ospf. Enhanced interior gateway routing protocol eigrp is a powerful distance vector routing protocol and is relatively easy to configure for basic networks. Enhanced interior gateway routing protocol eigrp is another routing protocol in addition to rip and ospf. So when you use both rip and eigrp together then the most accurate metrics to determine the best path to destination automatically get changed with change in network topology. By default, an eigrp summary address is assigned a default administrative distance value of 5. Eigrp was developed by cisco systems as a proprietary protocol, which can be used only on cisco routers but in 20 partial functionality of eigrp was converted to an open standard.
Eigrp enhanced interior gateway routing protocol eigrp is a ciscoproprietary hybrid routing protocol, incorporating features of both distancevector and linkstate routing protocols. Eigrp uses diffusing update algorithm dual to determine the best path among all feasible paths. Eigrp routes are denoted in the routing table with a d, which stands for dual diffusing update algorithm, which is the routing algorithm used by eigrp. Enhanced interior gateway routing protocol eigrp is an evolved version of igrp that addresses the demands of largescale internetworks and the changes in network technology that have been developed since the implementation of igrp routers that already use igrp can use eigrp because the metrics for both protocols are directly translatable, i. Eigrp is a distance vector protocol that classes and enhanced. Dual, the algorithm used to converge the control plane to a single set of loopfree paths is based on research conducted at sri international. The website was founded in late 2009 with the goal of providing free cisco ccna labs that can be completed using the gns3 platform. Enhanced interior gateway routing protocol eigrp is an example of a balanced hybrid routing protocol. Its time for the exciting part of our enhanced interior gateway routing protocol, or eigrp, discussion, configuration.
To properly configure r1 to load balance traffic on a 5. Eigrp general hybrid rputing protocol uses dual algorithm. Eigrp is a very popular routing protocol selection for those. Eigrp is an advanced distancevector routing protocol, it can only use it in an allcisco network, but eigrp more than makes up for this deficiency by being easy to configure, fast, and reliable. Eigrp equal and unequal cost load sharing eric leahy. The default behavior for rip, igrp and eigrp is to advertise directly connected routes when a network statement under the routing protocol. In eigrp, the delay used in computation is actually the sum of all the delays of the link. Configuring the enhanced interior gateway routing protocol variablelength subnet masking vlsm support eigrp is a classless routing protocol, which means that it advertises a subnet mask for each destination network. This article takes a look at the configuration of the enhanced interior gateway routing protocol eigrp. I want you to think that the network command enables the routing protocol for interfaces, but another thing will help you build that understanding better.
What is the enhanced interior gateway routing protocol. In 2008 free ccna workbook originally started as a sharable pdf but quickly evolved into the largest ccna training lab website on the net. Enhanced interior gateway routing protocol eigrp is an advanced dynamic routing protocol that is used for routing decisions and configuration on the routers. Eigrp utilise le split horizon ou annonce quune route est inaccessible. This part explains these values with neighborship building process in detail with example.
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