Eigrp is an enhanced version of igrp developed by cisco. A neighbor to a stub router would queue a query to the stub for a network it owns, but would not send it to the stub. The route will appear on all routers as an external route ex. 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. First create a topology like this,and configure ip address to. The eigrp stub routing feature allows a network administrator. When a router detects a topology change, the routing protocol can advertise this change to other routers. Only routes you specify are propagated from the stub router. Literature survey performance analysis of wireless local area network wlan was performed by using opnet simulator earlier through delivery. Redistributing static routes on eigrp stub routers gatestec. 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. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Jun 24, 2017 stub network means the network that is going to nowhere.
However, one of the pieces they are keeping close to the vest is the stub feature. To improve network stability and reduce resource utilization on the hq network you have decided to configure one of the branch routers, r2 as an eigrp stub router. To ensure that traffic from distribution devices are not routed through a remote device, you can configure route summarization on the distribution device and the remote device. You can make it a stub nosummary so that it doesnt receive type 3, 4 or 5 lsas further reducing memory resources. I was able to test this lab by create a default route to 0.
Specific dynamic routing protocols are covered in great detail in other guides. The pain of ipbase, cisco switches and eigrp routing i thought this was worth a post as i come across an issue where we use the ipbase ios on our core and access switches 4506 and 3560s at multiple sites and wanted to run eigrp as the routing protocol to advertise all our networks but cisco have locked down to allow stub only eigrp so. How to configure enhanced interior gateway routing. Chapter routing protocols rip, ospf, and bgp pdf created with fineprint pdffactory pro trial version. Sep 21, 2011 the stub routing feature prevents suboptimal routing in typical hubandspoke networks by preventing stub routers from being used as transit routers. Stub area an area that has a single exit point and blocks type 57 lsa types and receives type 34 lsas with a default route 0. Certain prerequisites need to be considered when configuring eigrp stub routing. Eigrp applies an administrative distance of 90 for routes originating within the local autonomous system. Aug 30, 2011 this is possibly without the redistribution and eigrp stub static command. If we consider an example, the eigrp packets that are encapsulated in the ip can be sent and receive by using the advantage of the ip eigrp module.
If you omit the connected which is default btw, and specified eigrp stub summary, then it will not advertise the connected route even if you have the network command specified to advertise. We will talk about what problems the feature helps overcome and we will look at how to configure and verify this feature on real. The main difference between the igrp and eigrp is that, interior gateway routing protocol is classful routing technique, while enhanced interior gateway routing protocol. Eigrp stub router functionality ip routing cisco systems. 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. Eigrp stub routing is often used in the hub and spoke topology where the eigrp stub is enabled on the spoke routers. Though it can be used for traffic engineering as well. Maybe if you can paste the output of debug eigrp packet terse.
Catalyst 6500 series switch and cisco 7600 series router firewall services module configuration guide using the cli. This lab uses cisco 1941 routers with cisco ios release 15. Eigrp applies an administrative distance of 170 for external routes coming from outside the local autonomous system eigrp. Based on the exhibited routing table, how will packets from a host within the 192. Any neighbor that receives a packet informing it of the stub status will not query the stub router for any routes. For the redundancy between them, i am running hsrp. It is also worth saying that this eigrp stubsite command resets the peers on wan interfaces and initiates relearning of routes from wan neighbors.
The eigrp stub routing feature allows a network administrator to prevent from cmit 350 at university of maryland, college park. Ospf and eigrp stubs solve somewhat different problems. Protocol rip, enhanced interior gateway routing protocol eigrp, open shortest path first ospf, and interior gateway routing protocol igrp are used and compared for testing the performance 9. Eigrp stub routing feature enable you to limit the eigrp query messages scope in the network. The leak map references a route map that matches one or more acls that permit the matched subnets or addresses to be leaked.
The first method is via static routein conjunction with. Eigrp has a few methods to disseminate the default route. Eigrp has the fastest router convergence among the three protocols we are testing. Most networks cant supportand have no need for the full internet route table,instead they rely on a single default routeto reach the internet. Unlike igrp and rip, eigrp does not send out periodic route updates. You can verify that routers have become neighbors by using the show ip eigrp neighbors command on either router.
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. An openshortestpathfirst ospf area with one default ospf routing domain path the area may have multiple routers that know of only one default exit route. The most useful command for checking neighbor status is show ip eigrp. Like other linkstate routing protocols, eigrp uses eigrp hello packets to establish relationships with neighboring eigrp routers. Eigrp updates are sent out only when the network topology changes. By this features it advertise only required routes. The second thing in regards to network stability that eigrp stub routing gives us is automatically preventing suboptimal transit routing. 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.
When the stub routing feature is enabled on the spoke router, the router only advertises specified routes to the hub router. If you are keeping up with ciscos announcements regarding eigrp, you are aware that cisco has released their proprietary routing protocol into the open. Eigrp stands for enhanced interior gateway routing protocol and is a routing protocol created by cisco. Enhanced interior gateway routing protocol is routing protocol like interior gateway routing protocol. The network depicted above consists of only two routers. The remote device can be dualhomed to two or more distribution devices. Eigrp routers do not send periodic, fulltable routing updates.
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. Scaling eigrp networks with stub routers nil learning. 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. A stub network is a network accessed by a single route, and the router has no other neighbors. 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. Instructor another key concept for the ccnp testas well as most modern networks is default routing. Configuring a router spoke as stub means the connecting hub router wont propagate the query further to the spoke. 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. Site devices acting as stub result in reducing the query domain thereby enhancing improved performance. Eigrp stubs are confined to individual routers, not areas. Lets look at some configuration examples for the different stub types. Routers configured as stubs do not forward eigrp learned routes to other neighbors. Nov 30, 2010 router david and pamela should have 4.
Jun 14, 2011 in this video you will learn about the eigrp stub routing feature. Eigrp stub routing cisco ios cookbook, 2nd edition book. Eigrp is a classless protocol, and thus supports vlsms. A stub router builds a neighbor adjacency with its hub routers, and will inform neighbors of its stub status. Cisco ios software allows administrators to select the type of routes that the stub router should advertise to the hub router. Comparison of rip, ospf and eigrp routing protocols based on. A stub network, or pocket network, is a somewhat casual term describing a computer network, or part of an internetwork, with no knowledge of other networks, that will typically send much or all of its nonlocal traffic out via a single path, with the network aware only of a default route to nonlocal destinations. Eigrp stub routing is one of the feature of eigrp routing protocol to improve the stability and reduce resource utilization. View and download cisco 7604 configuration manual online. Multicast stub routing and igmp helper multicast stub routing can be used for remote sites that are connected to the main site using low bandwidth links. More detailed description of these three routing protocols will be. Providing ease of routing table maintenance in smaller networks that are not expected to grow significantly. 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. Examples of routing protocols include rip routing information protocol, eigrp enhanced interior gateway routing protocol, and ospf open shortest path first.
Routers exchange routing information to learn about remote networks. Jun 14, 2011 the second thing in regards to network stability that eigrp stub routing gives us is automatically preventing suboptimal transit routing. An eigrp stub router would inform its stub status to. Eigrp configuration step by step guide this tutorial explains how to configure eigrp routing protocol in cisco routers step by step with practical example in packet tracer. 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. 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. Basics of routing static routing dynamic routing classification of dynamic routing administrative distance and metric link state routing and distance slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The router shares routing messages and routing information with other routers that are using the same routing protocol. This type of stub can be used in conjecture with the other stub types excluding receiveonly. Pdf a survey of the eigrp standard and following opensource.
As you can see the figure above, router 3, router 4 and router 5 are stub. In this video you will learn about the eigrp stub routing feature. 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. In ospf, you make an area stub so that it does not receive type 5 or 4 lsas thus reducing the size of the lsdb and saving memory resources. Also, eigrp stub can limit the query when the upstream routers go to active state searching for the route. Eigrp stub routing feature improves network stability, reduce resources utilization and simplifies stub router configuration. Stub router functionality, which cisco introduced in cisco ios software release 12. Stub routing is typically used at branches single node sites to keep the routing table small.
When you use pim dense mode these links might become overburdened with multicast traffic because of the flood and prune behavior of pim dense mode. Comparison of rip, eigrp, ospf, igrp routing protocols in. This lab will demonstrate the default eigrp stub type as shown below. To enable stub routing, use the eigrp stub configuration command. Eigrp and troubleshooting routing protocols 67 170603i. 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. In eigrp topology,to prevent unnecessary querying, spoke routers in a hubandspoke environment can be configured as stub routers. Now, when i check the distribution routers, there is the route, pretty as a sunrise on a morning in may. The times at which routing decisions are made depend on whether the network uses datagrams or virtual circuits. They connect to my corportate networe via gre tunnels using dmvpn as part of a 24 network. Configuring eigrp stub area networks free ccna workbook. How to configure eigrp stub routing configuring the eigrp stub routing autonomous system configuration summary steps 1.
If parameter is unset then dn bit is used according to rfc. Eigrp applies an administrative distance of 90 for. Once the card reaches the postal code, the appropriate delivery post of. The pain of ipbase, cisco switches and eigrp routing. Redistribution is the importing and exporting of routing information from one routing protocol to another. The eigrp stub site command is mutually exclusive with the eigrp stub command. Designate passive interfaces passiveinterface default. Updates are sent when a change occurs, and include only the change. The stub router responds to all queries with the message inaccessible. A dynamic routing table is created, maintained, and updated by a routing protocol running on the router. 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. Eigrp is a ciscoproprietary hybrid routing protocol, incorporating features of.
Two routers connected to each other, r2 has a loopback interface. Now it is time to check eigrp stub and design options of eigrp. Originally, it was only available on cisco hardware but since a few years, its now an open standard. On the other hand, branch eigrp routing is simple for a single router defaultgateway site. Now we are going to see eigrp routing configurations with simple network topology using packet tracer, eigrp routing configuration full video step 1. Ospf stubs save resources in the stub area by blocking external routes inside the area except, of course, nssa. Enhanced interior gateway routing protocol is ciscos proprietary routing protocol based on diffusing update algorithm. 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. Introduction to enhanced interior gateway routing protocol. The router will not advertise routes received from other eigrp neighbors to the hub router. Enable the eigrp protocol on both routers so that hosts on the both routers can. Pdf on nov 1, 2018, martin kontsek and others published a survey of the eigrp. Eigrp stub routing following steps are used to enable the asa as a stub router, they are.
Each router has a directly connected subnet that needs to be advertised through eigrp. The only route for ip traffic to reach the remote device is through a distribution device. To demonstrate the different stub types i will use the following topology. Eigrp is called a hybrid or advanced distance vector protocol and most of the rules that apply to rip also apply here. Command arranges the interfaces and the network used in the particular routing task.
Comparison of rip, ospf and eigrp routing protocols based. Routing table eigrp routing table terms active state router is trying to find a route. For this well match the desired networks in an accesslist and then implement eigrp stub leak map. My debugging is still enabled so the neighbors will show you a message that the configuration has. Eigrp stub routing with hsrp and dmvpn cisco community. Routing protocol packets share a common protocol header routing protocol packets are sent with type of service tos of 0 five types of ospf routing protocol packets hello packet type 1 database description packet type 2 linkstate request packet type 3 linkstate update packet type 4 linkstate acknowledgement. A basic routing problem in the postal network, then, is as follows. A good stub network analogy is an island that relies on a bridge as the sole mode of transportation to the mainland.
This is mainly used for protocolspecific requirements and is responsible for the network layer. 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. Adtran stub routing configuration manual pdf download. Use the eigrp stub command to configure a router as a stub where the router directs all ip traffic to a distribution router. The stub feature does not prevent routes from being advertised to the remote router. Ccna lab manual router infotech, confidential document only for internal circulation page 3 procedure. Static routes are commonly used when routing from a network to a stub network. Configures an eigrp router as a stub router that will only advertise redistributed routes. Pdf distance vector routing protocols were popular choice among network.
Before we understand what the stub routing does we need to understand how eigrp routing works internally. If we configure router 3, router 4 and router 5 as stub, router 3, router 4 and router 5 say that i am stub to router 2 when neighborship is being established. Understanding ciscos eigrp stub router feature interface. Eigrp administrative distance 5 summary 90 internal 170 exernal eigrp multicast address 224. 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. There is also some situations where if you have a limited license youll only be able to enable stub routing. Eigrp stub routing is commonly used over dmvpn networks having multiple sites with single device in each site. The stub network cannot be a transit router for eigrp instead it has only one eigrp neighbor. Feb 09, 2012 eigrp stub static now, when i check the distribution routers, there is the route, pretty as a sunrise on a morning in may.
Eigrp adheres to the following hybrid characteristics. How to configure eigrp routing protocol with simple. Disable automatic route summarization no autosummary. An eigrp stub router would never receive a query from neighbors regardless if the downed network is being advertised by a neighbor or not. Useful in some ce pe scenarios to inject intra area routes into vrf. When a neighbor changes a metric, or when a topology change occurs, and the successor route is removed or changes, dual checks for feasible successors for the route and if one is found, dual uses. Ccnp route chapter 2 lab 22, eigrp stub routing version 7. It is the link state routing protocol as well as vector routing protocol.
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