May 02, 2012 this document describes how to configure mutual redistribution between enhanced interior gateway routing protocol eigrp and border gateway protocol bgp. You have been tasked with establishing connectivity between these two corporations. If youve completed lab 102 configuring mutual ospf and rip redistribution and lab 103 configuring mutual ospf and eigrp redistribution then you should be no stranger to mutual route redistribution if you did not complete the previous labs then to summarize mutual route redistribution up in a pretty little nut shell. Eigrp it is a cisco standard routing protocol now open standard protocol from 20 it supports maximum 255 routers in the network. Perhaps company a runs ospf, and company b runs eigrp, and the two companies merge. Ospf open shortest path first is the most widely used igp interior gateway protocol large enterprise networks. Mutual route redistribution is a common remedy when companies acquire other companies that use different routing protocols. Pdf performance analysis and redistribution among ripv2. Eigrp doesnt have this equivalent and needs the metric defined.
An example enterprise network that consists of two routing instances. Now its time to actually configure some redistribution. And now we can configure ospf redistribution into our eigrp network on r3 with the router process command redistribute ospf 10. Configuring mutual eigrp and rip redistribution free. Oneway redistribution will occur with ospf routes being redistributed into eigrp. Anyway, coke utilizes an eigrp based ipv6 network while pepsi chose to go with ipv6 and ospf because well, the coin landed on tails. Configuring cisco route redistribution between eigrp and ospf. Now lets check iosv4 to confirm he can see those three networks. Lab 102 configuring mutual ospf and rip redistribution, then you should have a basic understanding of mutual route redistribution. Comparison of rip, eigrp, ospf, igrp routing protocols in. Redistributionmigration performed one segment at a time. Ospf and eigrp are without doubt, two of the best internal routing protocols out there. Company a runs the eigrp routing protocol and company b runs the ospf routing protocol.
This is a quick video tutorial on how to redistribute eigrp routes into ospf routers and ospf routes in eigrp routers. This lab will discuss and demonstrate the configuration and verification of mutual ospf and eigrp redistribution. Configuring mutual eigrp and rip redistribution free ccna. Administrative distance internal 90 external 170 external routes when the routes redistributed in eigrp it shows ad value 170 in routing table eigrp is now an open standard, cisco made it open standard in year 20. Rip routing information protocol is one of the oldest routing protocols still in service. It is a advance distance vector routing protcol therefore it also do rouing by rumour. If not then to summarize it all up for you in a pretty little nut shell. There is no tagging osfp while redistributing in bgp but did not go too deep into configs 2 4, i just checked the first. All the routes that are redistributed will have that default metric. Pdf performance analysis of route redistribution among. Great, they showed up as ospf external type 2 routes, they prefer the path of iosv2.
Suboptimal routing when redistributing between ospf. Hop count is the metric that rip uses and the hop limit limits the network size that rip can support. Lab 10 two way distribution between ospf and eigrp router 1 router 2 router 3 router 4 serial 0 10. Mututal redistribution between ospf and eigrp is uncommon however it is used. Lets start with the redistribution between ospf and rip. However, eigrp will not autosummarize external routes unless a connected or internal eigrp route exists in the. Pdf in a network topology, it is very usual to use various kinds of routing. Path manipulation via eigrp and ospf redistribution techstat. Finally, eigrp was configured to redistribute all ospf routes from processid 20, and apply a metric of 0 bandwidth. How to configure route redistribution between eigrp and ospf. Eigrp is denoted by d for internal and dex for external in routing table eigrp is the only protocol that have backu.
Network administrators will usually be more comfortable with ospf because its more commonly deployed. Ospf uses areas which means you can segment the network more logically. Ospf redistribution among different ospf processes cisco. The router will share the eigrp learned routes with the ospf routers in area 20. Dec 16, 2015 for ospf, it uses a default metric of 20 if you dont specifically set the metric parameters on the redistribution of eigrp ospf. We have one router which runs eigrp r3, one runs ospf r2, and third r1 runs both. Company a has bought company b and must merge its network into its own. First ive set up an ospf relationship between r3 and r4. Comparison of rip, ospf and eigrp routing protocols based on. Eigrp to ospf redistribution question cisco community. Keywords eigrp, ospf, route summarization, route redistribution. Chapter 4 lab 42, redistribution between eigrp and ospf.
Twoway redistribution will occur between the ospf and eigrp routing domains. However, ospf does not do any ospf route selection between processes for instance, ospf metrics. Now we will continue by configuring redistribution. Ccnp route chapter 4 exam answers version 7 score 100%. Mutual redistribution between eigrp and bgp configuration. Ra router is running ospf and rc router is running isis. Eigrp, ospf, rip, redistribution, asbr, routing protocols. When enabling multiple ospf processes on a router, from the software perspective, the processes are independent. Suboptimal routing when redistributing between ospf processes. So, even though includeconnected is added to redistribute ospf and redistribute eigrp it does not seem to work. Mar 16, 2018 ospf and eigrp are without doubt, two of the best internal routing protocols out there. Specify default metric for all the routes and issue redistribution command.
Hello all, wanted to confirm an eigrp ospf mutual redistribution behavior which i tested in my lab, only question i had is when injecting eigrp 170 routes redistributed from another router into an ospf process, these injected routes do not appear in the routing table but i do see them in the eigrp topology table and will only appear in the route table if the ospf routes dissapear. From the command line, eigrp doesnt allow redistribution of eigrp from vrf. We will use the network shown in figure1 to learn how to configure routing redistribution. This document describes how to configure mutual redistribution between enhanced interior gateway routing protocol eigrp and border gateway protocol bgp.
Luckily, we found a router in a janitors closet that randomly happened to be connecting the two companies, so that made it easy. Route redistribution is the process of using a routing protocol to advertise routes that were learned by another means e. Mututal redistribution between ospf and eigrp is uncommon however it is used mostly in company acquisitions or band aiding poorly architected networks. This router is the junction between the two networks and runs both ospf and eigrp. Not only do they support vlsm and manual route summarization, both keep backup routes with ospf going the extreme by keeping all available routes to a destination. Review of route redistribution best cisco ccna ccnp and. The purpose of routing protocols is to learn of available routes that exist on the enterprise network, build routing tables and make routing decisions. We have assumed that the basic routing protocol configuration on all routers is present. Since the ospf route has a lower administrative distance, it will get placed in r2s routing table and the r3provided route will be ignored.
Cisco mutual redistribution between eigrp and bgp and match. Advertise networks in ospf area 0 with specific wildcard mask. It organizations that want to migrate from eigrp to ospf have three options. Pdf performance analysis and redistribution among ripv2, eigrp. Oct 25, 2011 redistributing via eigrp 100, ospf 100. Instructor while ospf redistributionconfigures similarly to eigrp redistribution,its fairly different under the hood. How to configure redistribution between ospf into eigrp and also between eigrp into ospf on cisco routers. Let me break down the various parts of the above command. Without route redistribution, the routers in the rip instance do not have knowledge of the destinations in the ospf instance, and viceversa. Ospf does have default metrics but in eigrp must set them. Eigrp enhanced interior gateway protocol designed by cisco system which can be used only in cisco routers, but in 20 it became open source, so it can be used in other routers 5 7. Neighbor table and topology table are maintained by the eigrp enhanced interior gateway protocol 10.
Basic redistribution between cisco eigrp and ospf 1. Feb 02, 2017 this is a quick video tutorial on how to redistribute eigrp routes into ospf routers and ospf routes in eigrp routers. Route redistribution routemaps and tagging daniels. If so then yes you will only see the eigrp routes if the ospf routes disappear. How to configure route redistribution between eigrp. The engineer will also need to take several other objectives into account such as route summarization, redistribution and the actual connection between the two companies over a leased line. Now r1 with r3 should be eigrp neighbors and r1 with r2 ospf neighbors, check them with show ip eigrp neighbors and show ip ospf neighbor commands. Dec 26, 2014 now r1 with r3 should be eigrp neighbors and r1 with r2 ospf neighbors, check them with show ip eigrp neighbors and show ip ospf neighbor commands. Ospf uses lsas to represent external routes and apply a different logic to calculate routes to external subnets. Route redistribution has been configured from an ospfv3 domain into an eigrp for ipv6 domain. Until there is one routing protocol to rule them all, there is a need to have multiple routing protocols peacefully coexist on the same network. Ospf protocol, inside one ospf process, always prefers the internal route over the external route. This video is made with packettracer simulating cisco routers.
Review of route redistribution pdf file free download, mutual route redistribution, eigrp ospf and bgp redistribution, seed metric,route distribution configuration step by step pdf file download free. Refer to cisco technical tips conventions for more information on. This approach is suited for those who are adding osfp devices to a network and will migrate existing devices from eigrp to ospf. There any many things which are in the basics of eigrp. The major role of routing protocol is to find the best route from source to destination. Cisco mutual redistribution between eigrp and bgp and. You can also see that r3 is now aware of the ospf routes of company b. In this lesson well cover redistribution between ospf and rip. Oneway redistribution will occur with eigrp routes being redistributed into ospf. Integrateda new network buildout combined with a protocol migration.
Ospf redistribution into eigrp it tips for systems and. In this lab i will show you how to do a basic redistribution from ospf into eigrp. R3 retrieves route with ad 170 from r4, redistributes into ospf with ad 110. In the example above, r1 is participating in both ospf and eigrp while redistributing between them. In this last video in a series of eigrp videos, ill show you how to introduce another routing protocol into eigrp, in this case ospf and how to redistribute routes from eigrp into ospf and vise. First we will redistribute rip into ospf on r3 and r4. For ospf, it uses a default metric of 20 if you dont specifically set the metric parameters on the redistribution of eigrp ospf. Therefore, its routing table contains the routes from both networks. Administrative distances help with route selection among different. Redistribution between isis and ospf knowledge base. A cisco catalyst 6509 switch chassis is running both eigrp and ospf, and this is where the redistribution occurs. Nov 21, 2017 eigrp it is a cisco standard routing protocol now open standard protocol from 20 it supports maximum 255 routers in the network. Eigrp, by default, will autosummarize internal routes unless the no autosummary command is used. On the router thats running eigrp 200 and ospf 10, youll do dual redistribution.
Chapter 4 lab 42, redistribution between eigrp and ospf topology. In a previous lesson i explained the basics of redistribution. Same goes with eigrp when you redistribute ospf into eigrp, all the routes from ospf will be carried over to eigrp and advertised through out the autonomous system. Ill do this stepbystep so you can see what will happen. Microsoft word two way distribution between ospf and eigrp. Since i will want the ospf path to be the primary path the radio link, and the eigrp opteman to be the secondary path, would it. The ospf routes should be advertised into the isis domain as external routes. However, we have not configured redistribution yet. At the same time, on r2, ripng redistribute connected ospf networks.
To do redistribution from another routing protocol into eigrp you have to use redistribute command as a router eigrp subcommand. Find answers to cisco mutual redistribution between eigrp and bgp and match statements from the expert community at. Second, the policybased functionality of rr makes it resemble bgp. Redistribution from ospf into eigrp and viceversa issues. Basic redistribution between cisco eigrp and ospf the most common scenario for big enterprise networks with multiple routers is to have a single igp routing protocol igp interior gateway protocol running between the routers in order to distribute all the routing information of the network. Jun 12, 2015 basic redistribution between cisco eigrp and ospf 1. If youve completed lab 102 configuring mutual ospf and rip redistribution and lab 103 configuring mutual ospf and eigrp redistribution then you should be no stranger to mutual route redistribution. Predusca 4, has compared the rip, eigrp and ospf protocols using cisco packet tracer by various simulation scenarios to compare their performance. I wont tell you the answer completely, but lets use the eigrp network. To solve the problems, the analysis and comparison of performance between the enhanced interior gateway routing protocol eigrp and open shortest path first ospf will be applied. How to convert pdf to word without software duration. Lets add explicit redistribute connected statements on r3. Configure mutual redistribution at rb router by using summarization wherever possible.
Dec 03, 2014 administrative distance internal 90 external 170 external routes when the routes redistributed in eigrp it shows ad value 170 in routing table eigrp is now an open standard, cisco made it open standard in year 20. If you are interested in a tutorial about redistribution eigrp routes into ospf take a look at online dating sites in 2019 tutorial. If the routes are for different destinations then on the router doing the redistribution between eigrp and ospf you should see the eigrp routes are ad 170 and only downstream ospf routers will then see those routes as ospf routes with an ad of 110. Redistribution between cisco eigrp into ospf and vice. Ospf is link state so it has a better view of the entire network than eigrp before it runs the spf algorithm. Network routing protocols igrp, eigrp, ospf, isis, bgp. Comparison of rip, ospf and eigrp routing protocols based. The configurations in this document are based on the cisco 7200 series router with cisco ios software release 15. It is link state routing protocol means in ospf every router has topological information in the form of lsas. Dec 20, 2011 company a has bought company b and must merge its network into its own. Redistribution is a process of passing the routing information from one routing. Total delay is 500120 microseconds, minimum bandwidth is 0 kbit. The route from r4 will be in ospf admin distance of 110 because r2 is also running ospf while the route from r3 will be an external eigrp route administrative distance of 170 by default.
This document also highlights some changes introduced in cisco ios software. Next, eigrp was configured to advertise the network of 10. As redistribution removes the metric and other information used by the protocol to avoid routing loops, a routing domain might use the redistributed route instead of its own route. When make redistribution into ospf external routes can be of two types. Redistribution will occur automatically between igrp and eigrp on a router, if both processes are using the same autonomous system number. Hello experts im working on a mutual redistribution problem between eigrp and bgp the idea is set a tag 210 to traffic coming from our lan on r22 so that it can be matched and denied on r37. For example, if a router is being configured to redistribute ospf into eigrp, only those ospf routes that are actively in the redistributing routers routing table will be redistributed into eigrp. This document provides guidelines for the redistribution of open shortest path first ospf between different processes. Ospf will also create a unique lsa for each external route. Mar 25, 2014 in this last video in a series of eigrp videos, ill show you how to introduce another routing protocol into eigrp, in this case ospf and how to redistribute routes from eigrp into ospf and vise. Redistribution between different processes is difficult, and special measures are necessary for the proper operation of the network. When redistributing routes from other igps into eigrp you have to keep in mind that you must specify the metric for the redistributed routes which can be done in two ways.
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