Set the maximum bandwidth eigrp can consume can be 100% ipv6 bandwidthpercent eigrp asnumber 1999999. Eigrp stub routing have functions common to that of an ospf stub area yet it have improved stability, reduces resource utilization and simplifies stub router configuration. Aug 16, 2001 before we configure summary routes with eigrp, lets take a look at the 1005a routing table. The eigrp stub routing feature provides four advantages when implemented in hubandspoke networks. Without the configuration of this option, eigrp will not send any static routes, including internal static routes that normally would be automatically redistributed. Cisco ios software allows administrators to select the type of routes that the stub router should advertise to the hub router. Keep in mind that the as number has to match on eigrp routers in order to become neighbors.
The eigrp stub command will automatically enable summarization of routes on r2. How to troubleshoot common eigpr issues examcollection. We will talk about what problems the feature helps overcome and we will look at how to configure and verify this feature on real. This lab will demonstrate the default eigrp stub type as shown below. Both are owned by cisco and operate only on their devices. Oct 28, 2011 so eigrp will therefore not add a summary route to either the topology table or ip routing table for these entries. I was able to test this lab by create a default route to 0. Three typical types of routing protocol are chosen as the simulation samples. The eigrp stub command prevents queries from being sent from r2 to r1. Eigrp introduction to eigrp basic eigrp conguration eigrp packets eigrp neighbor adjacency eigrp neighbor and topology table eigrp unequal load balancing eigrp variance command example eigrp.
It took me s of hours reading books and doing labs, making mistakes over and over again until i mastered all the routing protocols for ccnp. Enhanced interior gateway routing protocol eigrp is an example of a balanced hybrid routing protocol. Related documents related topic document title ciscoiosmastercommandlist, allreleases. Eigrp has a few methods to disseminate the default route. Pdf a survey of the eigrp standard and following opensource. If you like you can mix some of the options with the exception of receiveonly because it denies all advertisements. The stub router responds to all queries with the message inaccessible. The second thing in regards to network stability that eigrp stub routing gives us is automatically preventing suboptimal transit routing.
Focusing on intradomain dynamic routing protocols, the book provides an indepth understanding of ip routing and forwarding technologies, and their implementation within cisco routers. Instructor another key concept for the ccnp testas well as most modern networks is default routing. All right, as you can see, we have herea brand new topology. By this features it advertise only required routes. If your environment has need of this functionality, this blog may enlighten you as to continue reading understanding ciscos eigrp stub router. An eigrp stub router tells its neighbor that it doesnt know about the rest of the network, so theres no point querying it about other routes. Eigrp explained enhanced interior gateway routing protocol. How to configure eigrp stub routing cisco community. Different types of routing protocols are applied to specific network environment. However, one of the pieces they are keeping close to the vest is the stub feature. 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 3.
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. This means that queries will not be sent to stub routers, why send a query if its not possible to get a reply with an alternate path. Before we configure summary routes with eigrp, lets take a look at the 1005a routing table. Classless, no periodic updates, multicast updates, manual summarization, triggered partial updates at change 2 rapid convergence use dual diffusion update algorithm that keep a backup route for each best route, if available 3 loop free. The router will not advertise routes received from other eigrp neighbors to the hub router. Eigrp applies an administrative distance of 90 for. Stub routing is commonly used in hubandspoke network topologies. Eigrp stub routing have functions common to that of an ospf stub area yet it. It is a ciscoproprietary routing protocol for tcpip. Understanding ciscos eigrp stub router feature interface. The first method is via static routein conjunction with. Eigrp and troubleshooting routing protocols 69 ip routing protocols eigrp appletalk.
Summarizing ip routes with eigrp and ospf techrepublic. Only routes you specify are propagated from the stub router. Every router makes its decisions alone, based on the. There is also some situations where if you have a limited license youll only be able to enable stub routing.
Eigrp will form neighbor relationships with adjacent routers in the. Router r1 will advertise connected and summary routes only. Eigrp requires an autonomous system number because that is how it determines what routers belong to the same eigrp routing domain. It has several enhancements to scale the enterprise size network. Eigrp converges very quickly, it takes about the same time or not less than ospf takes to converge, but without the negatives of ospf. Ip routing eigrp configuration guide, cisco ios release 15seigrp stub routing.
Though it can be used for traffic engineering as well. Ill show you the configurations of eigrpcause remember eigrp is for a medium sizeto large enterprise networks. Eigrp stubs are confined to individual routers, not areas. Imagine for a second that the lan link over vlan 24 between r2 and r4 was a gigabitethernet link in a high speed corporate lan. Jun 14, 2011 the second thing in regards to network stability that eigrp stub routing gives us is automatically preventing suboptimal transit routing. Enhanced interior gateway routing protocol eigrp june 2007. The route will appear on all routers as an external route ex. Jun 24, 2017 this process is known as stuckinactive to prevent this problem, we have 2 solution methods. Now it is time to check eigrp stub and design options of eigrp. With rtp, eigrp can simultaneously multicast and unicast to different peers, which allows for maximum efficiency. Ospf stubs save resources in the stub area by blocking external routes inside the area except, of course, nssa.
The 1005a can run eigrp so no redistribution is needed between the 2500b and the 1005a. The underlying algorithm is reputed to be optimal with respect to the eigrp metric. The invention of the dual algorithm was attained by dr. The eigrp stub routing feature improves network stability, reduces resource utilization, and simplifies the stub device configuration. To enable stub routing, use the eigrp stub configuration command. 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. The stub network cannot be a transit router for eigrp instead it has only one eigrp neighbor. The purpose of ospf areas is to save resources by limiting the flooding of route updates to just inside the area. The eigrp is commonly the routing protocol of choice when using the.
Configuring the eigrp stub routing autonomous system configuration summary steps 1. The static keyword permits the eigrp stub routing feature to send static routes. Eigrp is a cisco proprietary routing protocol which means its only found on cisco equipment. Why eigrp is considered as the best routing protocol. The eigrp stub routing feature improves network stability, reduces resource utilization, and simplifies the stub. The leakmap keyword configures the eigrp stub router to advertise those routes that would previously not been advertised based on the default operation of the stub routing feature. If the rule ad enhanced interior gateway routing protocol eigrp is an advanced distance vector routing protocol based on the principles of the interior gateway routing protocol igrp. Eigrp stands for enhanced interior gateway routing protocol.
Eigrp routers do not send periodic, fulltable routing updates. In a hubandspoke network, one or more end stub networks are connected to a remote device the spoke that is connected to one or more. How to configure eigrp stub routing configuring the eigrp stub routing autonomous system configuration summary steps 1. Routing table structure routing table principles 3 principles regarding routing tables. 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. 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.
An eigrp stub advertises its own routes, but doesnt advertise routes it learns from other parts of the network. Routing information protocol distance vector routing share the most you know about the entire autonomous system share with all your direct neighbors, and them only share periodically, e. So eigrp will therefore not add a summary route to either the topology table or ip routing table for these entries. Stub routing is typically used at branches single node sites to keep the routing table small. Configuring eigrp stub routing 416 configuring a summary address for eigrp 4. Dual also helps ensure a loopfree routing environment. Stub routing is commonly used in a hub and spoke network topology in which one.
If you are keeping up with ciscos announcements regarding eigrp, you are aware that cisco has released their proprietary routing protocol into the open. What the stub feature does is to define that this is the end of the network, i am a leaf on the tree. A router that is configured as a stub sends a special peer information packet to all neighboring routers to report its status as a stub. Enable eigrp for ipv6 on the interface ipv6 eigrp asnumber.
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. Enhanced interior gateway routing protocol eigrp is an advanced distance vector routing protocol based on the principles of the interior gateway routing protocol igrp. Stub routing is commonly used in a hub and spoke network topology. Rfc contains authentication tlv format and description. 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. Jun 14, 2011 in this video you will learn about the eigrp stub routing feature. Eigrp is a ciscoproprietary hybrid routing protocol, incorporating features of both distancevector and linkstate routing protocols. Nov 30, 2010 router david and pamela should have 4. Eigrp is commonly the routing protocol of choice when using an all cisco network with no requirement for crossvendor operation. Ospf and eigrp stubs solve somewhat different problems. In a hub and spoke network, one or more end stub networks are connected to a remote router the spoke that is connected to one or more distribution routers the hub. This is possibly without the redistribution and eigrp stub static command.
Sep 21, 2011 the leakmap keyword configures the eigrp stub router to advertise those routes that would previously not been advertised based on the default operation of the stub routing feature. A manually configured route used when routing from a network to a stub network. The eigrp stub routing will prevent this issue by simply restricting a spoke. Eigrp is a classless protocol, and thus supports vlsms. Stub routing is one part of a recent series of enhancements to eigrp, which were. To enable eigrp on a router you use its router command router eigrp. That speeds up convergence by limiting the number of queries a router has to process. Rip routing information protocol is one of the oldest routing protocols still in service. 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.
What is the enhanced interior gateway routing protocol eigrp. The only thing with eigrp, that its cisco proprietarymeaning you can only use it on cisco routers. When trying to configure eigrp it always says this eigrp is restricted to stub configurations only on this platform. This paper concentrates upon one of the most popular routing protocol, which is enhanced interior gateway routing protocol 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. Its just that youre limited to those particular routers. The first one being eigrp stub which is the default eigrp stub type and will send connected and summary routes or you can use eigrp stub connected summary which will give you the same result.
Jun 09, 20 enhanced interior gateway routing protocol eigrp is another routing protocol in addition to rip and ospf. Comparison of rip, ospf and eigrp routing protocols based on. Ciscos proprietary routing protocol eigrp is one of the two most widely employed routing protocols in the internet. Static default route lets start with the rst option, the static. We will see how eigrp works to provide best routes and how it converges at the time of selected route failure. Enhanced interior gateway routing protocol eigrp is an advanced dynamic routing protocol that is used for routing decisions and configuration on the routers. Eigrp adheres to the following hybrid characteristics. What is eigrp and how does eigrp protocol work and choose the route ccna 2018 duration. Eigrp configuration guide, cisco ios xe release 3s. Pdf on the convergence of the eigrp routing protocol. You will find essential background information on ip addressing, general routing and forwarding processes, and routing table maintenance. Sep 10, 2016 what is eigrp and how does eigrp protocol work and choose the route ccna 2018 duration. Enhanced interior gateway routing protocol eigrp is another routing protocol in addition to rip and ospf. Ccnp route 300101 practice labs 2 eigrp stub sim steps to prepare for cisco ccnp route exam 300 101 2 eigrp stub sim note.
Eigrps benefits is that it requires much less processing time, much less memory and much less design than say ospf. The leak map references a route map that matches one or more acls that permit the matched subnets or addresses to be leaked. My debugging is still enabled so the neighbors will show you a message that the configuration has. When the stub routing feature is enabled on the spoke router, the router only advertises specified routes to the hub router. So r5 becomes a prime candidate to become a stub eigrp router in which case will receive all routes but only advertise connected and summary routes. You cannot run eigrp on juniper or adtran or any other router for that matter since eigrp is special only to cisco. Eigrp can call on rtp to provide reliable or unreliable service as the situation warrants. Pdf on nov 1, 2018, martin kontsek and others published a survey of the eigrp standard and following opensource. Related documents 219 standards 219 feature history for ip 219 routing chapter 3 configuring ospfv2 31 information about ospfv2 31 hello packet. Most networks cant supportand have no need for the full internet route table,instead they rely on a single default routeto reach the internet.
The eigrp stub command prevents all routes except a default route from being advertised to r1. Ccnpv7 route lab22 eigrpstubrouting instructor router. If your environment has need of this functionality, this blog may enlighten you as to continue reading understanding ciscos eigrp stub router feature. Updates are sent when a change occurs, and include only the change. Eigrp uses diffusing update algorithm dual to determine the best path among all feasible paths. When primary route fails, eigrp automatically switches to the backup route. Open vce files convert vce to pdf exam formatter vce mobile tutorial terms of service privacy policy billing policy. The following example shows how to configure eigrp. Configuring eigrp stub area networks free ccna workbook. Nov 21, 2011 when trying to configure eigrp it always says this eigrp is restricted to stub configurations only on this platform. Eigrp has a concept of stub routers, this is not the same as stub routing in ospf.
1284 914 1456 254 403 1531 622 226 106 1070 1232 1199 760 1416 728 1074 1332 503 1356 1480 1500 1022 912 735 1037 310 294 26 14 1179 118 68 1287 869