Redistributing static routes on eigrp stub routers gatestec. The eigrp stubsite command is mutually exclusive with the eigrp stub command. 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. In this example, we will configure eigrp on packet tracer. The route will appear on all routers as an external route ex. The network administrator does not understand the convergence of eigrp. Eigrp stands for enhance interior gateway routing protocol and it is enhanced distance vector and open standard routing protocol which uses dual algorithm to. Ccnp route chapter 2 lab 22, eigrp stub routing version 7.
Aug 30, 2011 this is possibly without the redistribution and eigrp stub static command. How to configure eigrp stub routing configuring the eigrp stub routing autonomous system configuration summary steps 1. Eigrp adheres to the following hybrid characteristics. Bigbids incorporated is a worldwide auction provider. Configure r1 s0, e0, r2 s1, s0, e0 in eigrp as 100 and r3 s02 in eigrp as 200. The network uses eigrp as its routing protocol throughout the corporation. Here is the collection of most frequently asked eigrp interview questions, if you are looking for basic networking interview questions or ccna interview questions you can go here what is eigrp. We will talk about what problems the feature helps overcome and we will look at how. The eigrp stub routing feature improves network stability, reduces resource utilization, and simplifies the stub router configuration. 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. Oct 28, 2011 so eigrp will therefore not add a summary route to either the topology table or ip routing table for these entries. To help explain this i will not only be covering the concepts behind eigrp stub routing but also the syntax options available and what impact each have on your routing design. Stub routing is commonly used in a hub and spoke network topology in which one. High availability campus network designrouted access layer.
Enhanced interior gateway routing protocol eigrp is an example of a balanced hybrid routing protocol. 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. This lab will demonstrate the default eigrp stub type as shown below. Access switch eigrp routing process stub configuration 15. Now, when i check the distribution routers, there is the route, pretty as a sunrise on a morning in may. Why eigrp is called an advanced distance vector or hybrid routing protocol. The stub network cannot be a transit router for eigrp instead it has only one eigrp neighbor.
What is the enhanced interior gateway routing protocol eigrp. Eigrp stub routing following steps are used to enable the asa as a stub router, they are. Enhanced interior gateway routing protocol eigrp page 1 of 2 cisco systems, a leader in the world of internetworking and routing technology, developed the interior gateway routing protocol igrp in the mid1980s as an alternative protocol to rip for use in tcpip autonomous systems. 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. The only route for ip traffic to reach the remote device is through a distribution device. Updates are sent when a change occurs, and include only the change.
How to configure eigrp routing protocol basic eigrp. Having said that it will advertise static routes does not mean that it will happen automatically. With rtp, eigrp can simultaneously multicast and unicast to different peers, which allows for maximum efficiency. Pdf on the convergence of the eigrp routing protocol. If your environment has need of this functionality, this blog may enlighten you as to continue reading understanding ciscos eigrp stub router feature. Jun 14, 2011 in this video you will learn about the eigrp stub routing feature. Then the first router learns about the network of the gre tunnels, and the ipsla comes back up again. Stub routing is commonly used in a hub and spoke network topology.
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. The eigrp stub routing is an effective method for limiting or restricting the query range, hence conserves the bandwidth due to the unnecessary queries, improves network stability and prevents the sia events. That speeds up convergence by limiting the number of queries a router has to process. 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. We will talk about what problems the feature helps overcome and we will look at how to configure and verify this feature on real. Stub routing is an eigrp feature primarily designed to conserve local router resources, such as memory and cpu, and improve network stability. It is also worth saying that this eigrp stubsite command resets the peers on wan interfaces and initiates relearning of routes from wan neighbors. Eigrp converges very quickly, it takes about the same time or not less than ospf takes to converge, but without the negatives of ospf. Jun 14, 2011 the second thing in regards to network stability that eigrp stub routing gives us is automatically preventing suboptimal transit routing. Stub routing is commonly used in a hubandspoke network topology. Set the maximum bandwidth eigrp can consume can be 100% ipv6 bandwidthpercent eigrp asnumber 1999999. Igrp represented a substantial improvement over rip, but like any successful company, cisco was not content. There is also some situations where if you have a limited license youll only be able to enable stub routing.
Stub routing can play a critical part in scaling eigrp to larger networks as it can directly help to reduce the chance of routes becoming stuck in active when they converge. I was able to test this lab by create a default route to 0. An eigrp stub advertises its own routes, but doesnt advertise routes it learns from other parts of the network. Enhanced interior gateway routing protocol eigrp is an advanced dynamic routing protocol that is used for routing decisions and configuration on the routers. Different types of routing protocols are applied to specific network environment. Three typical types of routing protocol are chosen as the simulation samples. Eigrp enhanced interior gateway routing protocol, is a cisco proprietary hybrid routing protocol. Eigrp is a ciscoproprietary hybrid routing protocol, incorporating features of both distancevector and linkstate routing protocols.
Eigrp can call on rtp to provide reliable or unreliable service as the situation warrants. Configuring eigrp stub area networks free ccna workbook. Designate passive interfaces passiveinterface default. In this video you will learn about the eigrp stub routing feature. Eigrp uses diffusing update algorithm dual to determine the best path among all feasible paths. Command arranges the interfaces and the network used in the particular routing task. 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. 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. We have different flavors so you can choose to which types of routes the stub router should receive queries or. 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 enhanced interior gateway routing protocol eigrp stub routing feature improves network stability, reduces resource utilization, and simplifies stub router configuration. Eigrp will form neighbor relationships with adjacent routers in the. Ip routing eigrp configuration guide, cisco ios release 12.
This feature is configured only on the spoke routers. Use the ip defaultnetwork command to accomplish this task. It is also worth saying that this eigrp stub site command resets the peers on wan interfaces and initiates relearning of routes from wan 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. How to configure eigrp filtering with prefixlists, distributelists and routemaps.
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. The eigrp stub site command is mutually exclusive with the eigrp stub command. Eigrp routers do not send periodic, fulltable routing updates. The eigrp stub routing feature improves network stability, reduces resource utilization, and simplifies the stub device configuration. Eigrp stub routing with hsrp and dmvpn cisco community. Enhanced interior gateway routing protocol eigrp is an advanced distance vector routing protocol based on the principles of the interior gateway routing protocol igrp. Ccnp route chapter 2 lab 24, named eigrp configuration. Eigrp is a ciscoproprietary hybrid routing protocol, incorporating features of. When trying to configure eigrp it always says this eigrp is restricted to stub configurations only on this platform. Here you will find answers to eigrp simlet question.
The leak map references a route map that matches one or more acls that permit the matched subnets or addresses to be leaked. Eigrp is a successor to the interior gateway routing protocol igrp. However, one of the pieces they are keeping close to the vest is the stub feature. Enabling the eigrp routing protocol configuring the proper network statements. The following six keywords can be used with the eigrp stub command to modify this behavior. Enable eigrp for ipv6 on the interface ipv6 eigrp asnumber. The first method is via static routein conjunction with. So, to prevent query packages fro m bei ng sent in all directions and eigrp losing the pedals, we will tell our r11, r12, r, r14, r15 and r16 routers that they are peripheral routers and that they have the right only to broadcast the networks they are directly connected to. How to configure eigrp routing protocol with simple network.
Disable automatic route summarization no autosummary. Instructor another key concept for the ccnp testas well as most modern networks is default routing. The required metric and the interface where the metric needs to be applied should be specified. The configuration of eigrp is similar to other routing protocols. 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. Though it can be used for traffic engineering as well. R3 is the new router from which they can reach all corporate subnets. Eigrp and troubleshooting routing protocols 69 ip routing protocols eigrp appletalk. This tutorial explains how to configure eigrp routing protocol in cisco routers step by step with practical example in packet tracer. Jun 24, 2017 this process is known as stuckinactive to prevent this problem, we have 2 solution methods. With this eigrp config, we will see important eigrp commands on cisco packet tracer. What is the enhanced interior gateway routing protocol. 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. The stub routing feature is most commonly used in hubandspoke networks.
When i disconnect the internet on the first router, the ip sla fails, and the secondary router works. Eigrp has a few methods to disseminate the default route. The most useful command for checking neighbor status is show ip eigrp. Ciscos proprietary routing protocol eigrp is one of the two most widely employed routing protocols in the internet. If you are keeping up with ciscos announcements regarding eigrp, you are aware that cisco has released their proprietary routing protocol into the open.
Understanding ciscos eigrp stub router feature interface. Comparison of rip, ospf and eigrp routing protocols based on. In order to raise network stableness and lower the memory usage and broadband utilization to r3, tut corporation makes use of route summarization together with the eigrp stub routing feature. Dual also helps ensure a loopfree routing environment. Metrics that need to be applied to specific interfaces, for eigrp traffic engineering. My debugging is still enabled so the neighbors will show you a message that the configuration has. First create a topology like this,and configure ip address to. Any neighbor that receives a packet informing it of the stub status will not query the stub router for any routes. Eigrp explained enhanced interior gateway routing protocol. Between the dmvpn routers and the remote site with the routers running hsrp, i am running eigrp with the remote routers set up a an eigrp stub.
Eigrp stub sim question by increasing the first distant office, js manufactures has extended their business. The second thing in regards to network stability that eigrp stub routing gives us is automatically preventing suboptimal transit routing. Routing table eigrp routing table terms active state router is trying to find a route. Study plan cisco ccnp routingswitching 300101 route. 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. So eigrp will therefore not add a summary route to either the topology table or ip routing table for these entries. Both are owned by cisco and operate only on their devices. A stub router builds a neighbor adjacency with its hub routers, and will inform neighbors of its stub status. Use the eigrp routerid command to configure the eigrp router id for the ipv4 address family. Eigrp and that need to be advertised per individual router. Eigrp applies an administrative distance of 90 for. The eigrp neighbor relationship and authentication are discussed with configuration and verification. Stub routing is commonly used in hubandspoke network topologies.
This is possibly without the redistribution and eigrp stub static command. 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. A device that is configured as a stub with the eigrp stub command shares connected and summary routing information with all neighbor devices by default. The underlying algorithm is reputed to be optimal with respect to the eigrp metric. Stub routers do not advertise all the information to the neighbors plus if a router is configured s stub query packets will not be received by that router. Now we are going to see eigrp routing configurations with simple network topology using packet tracer, eigrp routing configuration full video step 1. Eigrp stub configuration command increases scalability by limiting the. Rip routing information protocol is one of the oldest routing protocols still in service. Eigrp is a classless protocol, and thus supports vlsms. How to configure eigrp routing protocol with simple. Stub router functionality, which cisco introduced in cisco ios software release 12. They configured the remote office router r3 from which they can reach all corporate subnets. Stub routing is typically used at branches single node sites to keep the routing table small.
In eigrp topology,to prevent unnecessary querying, spoke routers in a hubandspoke environment can be configured as stub routers. Known as eigrp stuck in active is a state which occurs if a router does not receive a reply to a query within the configured active time 3 min. Eigrp administrative distance 5 summary 90 internal 170 exernal eigrp multicast address 224. In order to raise network stableness and lower the memory usage and broadband utilization to r3, js manufactures makes use of route summarization together with the eigrp stub routing feature. Enhanced interior gateway routing protocol eigrp is another routing protocol in addition to rip and ospf. Eigrp stub routing feature improves network stability, reduce resources utilization and simplifies stub router configuration.
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