What is the enhanced interior gateway routing protocol eigrp. Now have a look on the technology used in this routing protocol. 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. Configuring ip routing protocols on cisco routers page 2 of 59 file. 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. Eigrp adheres to the following hybrid characteristics.
Advertised distance cost between next hop and a destnation. Rip prevents routing loops by implementing a limit on the number of hops allowed in a path from source to destination. Distancevector protocols in use today include routing information protocol rip and ripv2, enhanced interior gateway routing protocol eigrp, and border gateway protocol. It support for variable length subnet mask vlsm, it maintain three type of tables i. It took me years to work out that the problem with this question is the question itself, not the answer. Before eigrp hit our scenes we had igrp, interior gatway routing protocol. Eigrp enhanced interior gateway routing protocol routing. Apply bandwidth, routing, and security policies across a variety of mediums mpls, internet, or 3g4g lte with a single consistent, intuitive workflow softwaredefined wan is a new approach to network connectivity that lowers operational costs and improves resource usage for multisite deployments to use bandwidth more efficiently. You also will see how to troubleshoot problems with eigrp. It is a scalable routing protocol, even the largest eigrp installation in the world network is running successfully with no eigrp offset. Igrp sends out periodic routing updates every 90 seconds. It would be scalable for any core backbone network to use eigrp as igp protocol for mpls labels switching since eigrp is the only protocol that maintains three tables neighbor, topology and routing. Enhanced interior gateway routing protocol eigrp is an interior gateway protocol suited for many different topologies and media. Mar 26, 2017 enhanced interior gateway routing protocol eigrp is an advanced dynamic routing protocol that is used for routing decisions and configuration on the routers.
Enhanced interior gateway routing protocol eigrp is one of the most popular internal routing protocols used on medium to large businesses and education networks today. Routing information protocols rip rip routing information protocol is a forceful protocol type used in local area network and wide area network. Cisco sr 500 series secure routers retirement notification. Mar 11, 20 only link state protocols have that capability but i know eigrp also uses some linksate protocol features to discover and update the neighbor. Where there are some dynamic routing protocol can be used to configuring routing tables in the router. Repeat for each advertised destination if destination is not in my routing table add the destination to my table else if nexthop field is the same replace existing entry with the new advertised one. Many software implementations exist for most of the common routing protocols. Out of scope eigrp pece for mpls l3vpn eigrp over the top otp eigrp stub site iwan eigrp multi topology routing mtr in named mode 2. Configuring mutual eigrp and rip redistribution free ccna. Enhanced interior gateway routing protocol eigrp border gateway protocol bgp intermediate systemtointermediate system isis lets discuss each of above protocols as below. Technology used in eigrp diffused update algorithm is similar to distance vector protocol. Igrp manages the flow of routing information within connected routers in the host network or autonomous system.
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. Dec 20, 2016 enhanced interior gateway routing protocol eigrp is an advanced distance vector routing protocol based on the principles of the interior gateway routing protocol igrp. There is interior gateway protocol igp than should be used for the routers in same domain network such as routing information protocol rip, enhanced interior gateway routing protocol eigrp, open shortest path first ospf and is. Routing protocol classification both types of routing protocols have advantage and disadvantages. Oct 09, 2014 interior gateway routing protocol igrp is a proprietary distance vector routing protocol used to communicate routing information within a host network. Exterior gateway protocols exchange routing information between autonomous systems. Enhanced interior gateway routing protocol eigrp enhanced interior gateway routing protocol eigrp is a ciscoproprietary hybrid routing protocol, incorporating features of both distancevector and linkstate routing protocols. Short for enhanced interior gateway routing protocol, eigrp is a proprietary cisco protocol based on igrp that combines the advantages of linkstate protocols with distance vector protocols. Eigrp basics eigrp was developed as a hybrid distance vector routing protocol that uses many of the same composite metrics as the interior gateway routing protocol igrp. Nov 12, 2019 eigrp supports classless ip subnets and improves the efficiency of the routing algorithms compared to older igrp.
Originally created as a proprietary protocol runnable only on cisco family devices, eigrp was designed with the goals of easier configuration and better performance than ospf. Enhanced interior gateway routing protocol eigrp exterior gateway protocols. Eigrp cheat sheet successor primary route to a destination. Exterior gateway protocol egp border gateway protocol bgp routing software. In a well designed network, eigrp scales well and provides extremely quick convergence times with minimal network traffic.
Top 5 network routing protocols explained lifewire. 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 intermediate systemtointermediate system isis. The protocol ensures that every router has routing. Cisco developed igrp in the mid1980s as an answer to the limitations of rip, the most significant of which are the hop count metric and the 15hop network size. Igrp adheres to the following distancevector characteristics. Enhanced interior gateway routing protocol eigrp is an example of a balanced hybrid routing protocol. Enhanced interior gateway routing protocol wikipedia. What is the interior gateway routing protocol igrp. Routing info routing info routing computation is distributed among routers within a routing domain computation of best next hop based on routing information is the most cpumemory intensive task on a router routing messages are usually not routed, but exchanged via layer 2 between physically adjacent routers internal. Rip v2, eigrp, ospf, bgp v4, and isis routing protocols routing protocols job is to maintain routing tables and route packets appropriately. Eigrp is being considered as the more scalable protocol in both medium and large scale networks. I have been working with cisco firewalls since 2000 where we had the legacy pix models before the introduction of the asa 5500 and the newest asa 5500x series. Sep 18, 2012 in this video you will see how to configure eigrp and explain the processes what are happening on the background.
C connected, s static, i igrp, r rip, m mobile, b bgp. Enhanced interior gateway routing protocol enhanced interior gateway routing protocol eigrp is a cisco proprietary protocol, which is an improved version of the interior gateway routing protocol igrp. This tutorial explains how to configure eigrp routing protocol in cisco routers step by step with practical example in packet tracer. Routing information protocol rip is a distancevector routing protocol used for both the tcpip and ipxspx protocol suites. Comparison of rip, ospf and eigrp routing protocols based. The enhanced interior gateway routing protocol is an enhanced distance vector routing protocol. Eigrp converges very quickly, it takes about the same time or not less than ospf takes to converge, but without the negatives of ospf. Eigrp explained enhanced interior gateway routing protocol. Igrp interior gateway routing protocol igrp is a ciscoproprietary distancevector protocol, designed to be more scalable than rip, its standardized counterpart. What is eigrp enhanced interior gateway routing protocol.
Is eigrp a hybrid routing protocol or advanced distance. If you want support information for the cisco sr 500 series secure. Dec 03, 2017 understand the basics of eigrp routing protocol with lab and packet captures. The protocol was designed by cisco systems as a proprietary protocol, available only on cisco routers. Eigrp is a successor to the interior gateway routing protocol igrp. Interior and exterior routing o an internet can be so large that one routing protocol cannot handle the task of updating routing table of all routers o thus, an internet is divided into autonomous systems as n as is a group of networks and routers under the authority of a single administration. Comparison of rip, ospf and eigrp routing protocols based on. Add one to the hop count for each advertised destination 2. For the distance vector type, eigrp enhanced interior gateway routing protocol will be used. You can view a listing of available routers offerings that best meet your specific needs. The cisco sr 500 series secure routers has been retired and is no longer supported endofsale date. Introduction to eigrpenhanced interior gateway routing protocol. Both are owned by cisco and operate only on their devices. Is eigrp a hybrid routing protocol or advanced distance vector routing protocol.
Three typical types of routing protocol are chosen as the simulation samples. Learn eigrp terminology neighbor table, topology table, routing table, pdm, rtp, dual algorithm autonomous system and administrative distance step by step with examples. By default, enhanced interior gateway routing protocol eigrp chooses a route based on minimum path bandwidth and accumulative delay, however in the past the formula that computes these values loses resolution on single links or etherchannel links above two gigabit. Different types of routing protocols are applied to specific network environment. Eigrp general hybrid rputing protocol uses dual algorithm protocol independant classless routing protocol. Eigrp stands for enhanced interior gateway routing protocol, it is also called balanced hybrid routing protocol or advanced distance vector routing protocol. Hop count is the metric that rip uses and the hop limit limits the network size that rip can support. This command is executed in router configuration mode of rip, eigrp or ospf to configure the routing process to redistribute routes from a different source into the configured routing process such as static into rip or rip into ospf.
Dynamic routing protocol uses a route that a routing protocol adjusts automatically for topology or traffic changes. Rip routing information protocol is one of the oldest routing protocols still in service. 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. It is also known as hybrid routing protocols that shares the attributes of both distance vector and link state. This question was discussed recently on the cisco ccie routing and switching study group website. Eigrp a fast routing protocol based on distance vectors. Pdf on the convergence of the eigrp routing protocol. Rip routing information protocol, distance vector ospf open shortest path first, link state isis intermediate systemintermediate system eigrp enhanced interior gateway routing protocol, distance vector, cisco proprietary exterior gateway protocols egp exterior gateway protocol, replaced by bgp. 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. Ciscos proprietary routing protocol eigrp is one of the two most widely employed routing protocols in the internet. Enhanced interior gateway routing protocol eigrp wide.
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