Pdf frame relay is a protocol used for connecting devices on a wide area network. The hub and spoke topology refers to a network topology where there is a central connection point to which multiple devices are connected. Many of us understand hub and spoke to be remote routers connected directly to a central hub router while a star is remote routers where some of the remote routers have direct connections to other remotes. Hubandspoke is generally chosen because most traffic is between the spokes and the hub. One central site that acts as a hub and hosts the primary. I have two cisco 2610xm with one of them got a serial nm4as 4 serial ports asyncsync and this would be my frs router. Depending on the topology of a customers frame relay network, packets traveling over a frame relay network may experience high latency relative to ip networks with anytoany connectivity. Sample hub and spoke frame relay network this simple network is an example of a frame relay hub and spoke topology and should give you a good idea of how dlci mappings work in a frame relay network. Disable ip splithorizon for eigrp autonomous system 10 on r1s frame relay hub interface. Frame relay basic configurations hub and spoke cisco. Youll learn how to change the encapsulation of each interfaces and why you should know both of frame relay encapsulation types, ietf as well as cisco. Dec 18, 2011 the previous article on configuring frame relay on cisco packet tracer explains it on a simulator, in this article ill show how a cisco router can be used as a frame relay switch.
Pdf establishing frame relay connections using packet tracer. Frame relay shares the bandwidth among multiple users and. Graph of approximate vcs required by network topology. Star topologies require the fewest pvcs, making them. The second configuration, figure 6, shows mgre at the hub and spoke routers, which will allow the spoke routers. The network requirements along with the considerations outlined above on the number of pvcs required in a design need to be addressed in using the various topology. On a cisco router, frame relay is most commonly supported on synchronous serial interfaces. Frame relay is a layer 2 data link widearea networking wan protocol that. A multipoint interface offers greater security compared to pointtopoint subinterface configurations. Each format has its advantageous and disadvantageous. Figure 5 may be a configuration some have seen before, but it will force the tunneled nbma network into a hub and spoke topology so the spoke routers will not be able to dynamically build a vpn to another spoke router. Configuracion hub and spoke estrella punto a multipunto desde 0link.
Every network or network segment can be viewed as being one of three topology types. By default, cisco ios uses eui64 to automatically generate the ipv6 linklocal address on an interface. Nhrp is a layer two resolution protocol and cache like arp or reverse arp frame relay it is used in dmvpn to map a tunnel ip address to an nbma address like arp, nhrp can have static and dynamic entries. Lets assume that in our lab today we have a basic frame relay hub and spoke topology with r2 being our hub, and r4, r5, and r6 being our spokes. Frame relay lab in this lab weve diagrammed a hub and spoke topology and dissect for your its connection, routing paths, and explain how these configurations work.
You only have to specify encapsulation framerelay on the physical interface. The hub and spoke design is the design that many frame relay networks use. You need to consider the topology from to understand the network and the equipment used to build the network. If you completed the previous lab you should have noticed on all routers in the frame relay hub and spoke topology that the adjacencies were flapping with the hub. The hub router acts as a frame relay switch, switching between isdn and serial.
Also you say that the hub has point to point subinterfaces and this is generally the best practice for frame relay. Which interface configuration commands are required on router a. Review a basic configuration of eigrp on a serial interface. For example, in a hub and spoke configuration, traffic must first travel. Frame relay basic configurations hub and spoke part 1. Jul 15, 2018 please note that this is not called a hub and spoke design because there is a network hub in the drawing. You want to use the ospf routing protocol between all three locations. Configuracion framerelay hub and spoke cisco packet. To provide efficient ip multicast support in frame relay networks, the underlying frame relay network architecture should be designed in a hub and spoke topology hierarchical topology. Remote sites are connected to a central site, which usually provides a service. Configuracion framerelay hub and spoke cisco packet tracer. The connection through a frame relay network between.
For example, if there is a hub and spoke frame relay topology where the hub. A star topology, also known as a hub and spoke configuration, is the common network topology. Frame relay hub and spoke topology is also known as star topology, which have a single hub or central router provides access to different core services and all other routers are connected to this hub are called spoke. Provides greater bandwidth than leased line reduces cost because it uses less equipment easy to implement frame relay is associated with layer 2 of the osi model and encapsulates data packets in a frame relay frame frame relay is configured on virtual circuits. The hub sites ethernet uni speed is determined by the amount of bandwidth required from all spoke sites and projected future growth of bandwidth or new spoke sites to be added. Frame relay is the most widely used wan technology because it. In a hub and spoke topology, spoke sites need to connect through the hub. A more scalable, less expensive solution is needed that also does not cause a bandwidth bottleneck at the hub router. One central site that acts as a hub and hosts the primary services connections from et 0718 at singapore polytechnic. It is also used with other protocols, for example dmvpn. In this lab, configure ospf as a pointtomultipoint network type so that it operates efficiently over a hubandspoke frame relay topology. It avoids splithorizon issues with distance vector routing protocols. A multipoint interface offers greater security compared to pointtopoint subinterface.
The topology of a frame relay network is comprised of different design formats. Aug 12, 2019 frame relay configuration isr router configuration frame relay hub router configuration r0 the hub router is configured with two subinterfaces to create a virtual circuit with each spoke. Wan architectures and design principles cisco live. Verify that routes from r2 and r3 are now being propagated through the hub to r4 and r5. Mar 02, 2020 the exhibit is a frame relay hub and spoke topology with router a as the hub. Which frame relay topology provides a connection from every site to every other site and maintains a high amount of reliability. In a dmvpn topology, the internet is used to connect the hub to the spokes and, because the. Frame relay topology frame relay is a nonbroadcast multiaccess nbma connection scheme. A free powerpoint ppt presentation displayed as a flash slide show on id. This means that although frame relay interfaces support multipoint connections by default, broadcast routing updates are not forwarded to remote sites.
The solution here is we can use 512 6 85 kbps on each subinterface of hub by using bandwidth 85 command. Nmba and pointtomultipoint, nbma neighbors must be statically configured on one subnet for all routers, it acts like lan environment with drbdr elections except broadcasts and multicast are not allowed. What is the advantage of using a multipoint interface instead of pointtopoint subinterfaces when configuring a frame relay hub in a hub and spoke topology. Hello, i am trying to solve a lab, but i got stuck. The same hub and spoke topology is used, only the frame relay switch router configuration is explained here refer the previous article for the hub router and spoke. Dmvpn, multiprotocol label switching mpls and frame relay. The second configuration, figure 6, shows mgre at the hub and spoke. For today, i prepared a presentation about how you can create a framerelay hub and spoke topology in gns3, save and use it whenever you need it. The most hard part is regarding fr switch, but luckily you dont have to deal with it, as this is usually a provider equipment, and they will do the l2 to l3 framerelay routing, providing you with the need dlci information. Read the wikipedia article to learn more about frame relay. Frame relay huband spoke topologies and subinterfaces.
How to configure a cisco router as a frame relay switch. What is the purpose of applying the command frame relay map ip 10. Nonbroadcast multiaccess nbma networks such as frame relay, x. In future work, different frame relay topologies such as. Frame relay networks are often designed in a hubandspoke topology, such as the topology shown in figure 117. Nhrp is a layer two resolution protocol and cache like arp or reverse arp frame relay it is used in dmvpn to map a tunnel ip address to an nbma address like arp, nhrp can have static and dynamic entries nhrp has worked fully dynamically since release 12. One example of where we can use a hub and spoke topology is in a frame relay network. A single core device the hub that connects to multiple remote devices the spokes.
Equivalent to a full mesh, or to a hubless hubandspoke. The network requirements along with the considerations outlined above on the number of pvcs required in a design need to be addressed in using the various topology layouts. In the previous lab you configured static neighbors on a frame relay hub and spoke between r1 and r2, r1 and r3, r1 and r4. In a hub and spoke topology, spoke sites need to connect through the hub site to communicate with any other site. In 2008 free ccna workbook originally started as a sharable pdf but. Which technology allows a layer 3 ipv4 address to be dynamically obtained from a layer 2 dlci. This is a cost effective solution except the hub is a single point of failure. A topology of twenty routers would need a total of 190 virtual circuits and 380 map statements. The main frame relay interface on hub router is 512kpbs which is not enough to use for 6 links of 128 kbps 768 kbps. Dmvpn topology behaves like a pointtomultipoint topology, where multipointgre is configured in the hub. If you have multiple sites, you can place all routers from all the sites on one subnet. My question is how do i connect them physically back to back with a db60 dtedce cable to make them a hub and spoke network. Question 7 what occurs on a frame relay network when the cir is exceeded. Frame relay networks can be designed using star, fullmesh, and partialmesh topologies.
Ping r2s lo0 interface from r5s lo0 interface to ensure ip reachability. Network designers should be careful when adopting this configuration to prevent splithorizon problems. This will cause the hub to have adjacencies with neighbors with different timers on the same physical network thus causing flapping adjacencies. Configure a basic frame relay permanent virtual circuit pvc, including. The setup here will use the hub and spoke configuration, router0 is the hub, router1 and router2 are the spokes. For example, in our frame relay topology a hub is connected with 4 spoke routers. Frame relay tutorialnetwork,frame,switch,topology,service. This tutorial does not include the configuration of the devices which form framerelay hub and spoke, but only the gns3 lab topology. The hub and spoke design is basically a star design utilizing frame relay s advantage of provisioning multiple vcs on a single physical connection often referred to as the access circuit. Dec 05, 2020 what is frame relay hub and spoke topology networking virtualization ccna 200 301 v1 0 frame relay explained with examples orbit computer solutions com frame relay analyzer frame relay part i ccna blog how frame relay works switch switches telco edge data center.
The nbma next hop address in this example is a frame relay dlci number. Here is the configuration for the hub and spoke routers. Frame relay is inherently a nonbroadcast multiaccess nbma network. If you completed the previous lab you should have noticed on all routers in the frame relay hub and spoke topology that the adjacencies were flapping with the hub router. How to configure framerelay hub and spoke in simple. Frame relay is associated with layer 2 of the osi model. In a hubandspoke network environment, the number of vcs required can be represented. Dec 18, 2015 configuring a frame relay hub in a hub and spoke topology. According to the route cert library of cisco, if you have a multipoint frame relay hub spoke topology configuration, the bandwidth of the hub router is set based on the lowest bandwidth multiply by the number of pvc.
However, every network or network segment can be viewed as being one of three topology types. The most common topology used in frame relay today is the hubandspoke. This implementation uses a star or hub and spoke topology in which frame relay devices are not connected to every other device in the frame relay cloud. The hub and spoke topology is also named a star topology, because the central hub acts as the center of a star and. To configure framerelay hub and spoke is not very difficult. C explanation an example of the output of show frame relay map command is shown below. Frame relay topologies a topology is the map or visual layout of the network. Each frame relay subinterface is mapped with the dlci number of the corresponding circuit configured in the packet tracer wan emulation cloud. In this step, you configure ospf for hub and spoke over frame relay using the nbma ospf network type, which is the default. D division of computer and information engineering, dongseo university, a free powerpoint ppt presentation displayed as a flash slide show on id. The hub and spoke topology is a network design where we have a central device the hub that is connected to multiple other devices the spokes. There are a couple of options for creating a frame relay topology. Use the ip address command to set the ipv4 address of the interface. You can also try this on live routers and other network simulators, but the frame relay switch configuration varies.
This drawing is to show how a star or hub and spoke network resembles the hub and spokes of a wheel. Here, topology is hub and spoke, with r1 the hub each pvc connects two interfaces pointtopoint, so requires separate ip subnet r1s s000 interface must be configured with two subinterfaces 21. Ip addresses can be conserved if vlsm is not being used for subnetting. Ratings 100% 1 1 out of 1 people found this document helpful. How to configure frame relay in cisco packet tracer. Subinterfaces in a hubandspoke frame relay topology, the hub router can be. In a wan environment this might be implemented using mpls, dmvpn, frame relay, etc. This document shows voice over ip voip over a frame relay network sample. Frame relay basic configurations hub and spoke part 1 of 4frame relay is wellsuited for a hub and spoke design. How to configure frame relay in cisco packet tracer jesins.
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