When troubleshooting a frame relay connection, what is the first step when performing a loopback test. Relay blocks, both large and small, are located in the engine compartment. The earth ground wire must be capable of conducting the current to blow the 15a fast blow fuse or breaker in the event of an inte rnal short circuit. In other words, when the relay control coil is not energized, the relay. The command output can provide information for troubleshooting the interface. Ce protocole est utilise par les fournisseurs dacces pour transmettre des signauxvocaux et numeriques entre reseaux locaux par lintermediaire dun reseau etendu. Instead frame relay ietf or frame relay cisco 2 ways to configure ietf encapsulation. A pvc is the logical path along an originating frame relay link, through the network, and along a terminating frame relay link to its ultimate destination. Describe advanced concepts of frame relay technology, including subinterfaces, bandwidth, and flow control. How does an mpls network differ from a frame relay network. Set the encapsulation of the get 30% discount on all your purchases at. Cisco confidential configure basic frame relay basic frame relay configuration steps. The maximum amount of data measured in bits that a frame relay internetwork is.
Issue the show frame relay lmi command on r1 and r3. The basic frame protocol, which is used in the frame relay is hdlc and the typical speed is higher than the x. This post focuses on framerelay troubleshooting for the ccie version 4. Troubleshoot problems with framerelay circuits on your. After entering the commands above to fix the frame relay problems, communication between the. Negotiated tariff metric in frame relay internetworks. From the html or pdf version of the manual, copy a configuration example into a text file, save the file with a name. The frame relay labs, unlike any of the other labs in exploration 4, have two dce links on the same router. Use the clear framerelayinarp command to clear dynamically created frame relay maps that are created using inverse arp. Ccnav5 s4 connecting networks chapter 4 frame relay download.
In this tutorial ill explain to you why we use d framerelay and how it works. Frame relay configuration commands huawei technical support. Notice another very useful troubleshooting command applicable to the frame relay switches. Following the leading flags field are 2 bytes of address information. Internetworking troubleshooting handbook, second edition. Scenario your isp has provisioned frame relay pvcs for the international travel agency wan. Frame relay digital service unit users manual installation guide pub. Frame format the frame relay frame is shown in figure 181. Instead framerelay ietf or framerelay cisco 2 ways to configure ietf encapsulation. Telstra our customer terms frame relay services section. If you use puttygen, convert generated keys to right type. This will show you if the lmi packets are being sent and received properly. The router connected to the frame relay network learns dlci information from the lmi status messages sent by the frame relay switch to the router.
Jun, 20 in the previous article, demystifying frame relay, we had a long journey trying to understand the subtleties of frame relay technology as well as its configuration. Frame relay is a widearea network with the following features. The structure of the frame relay frame shown in the figure. Unlike leased lines, frame relay requires only a single access circuit to the frame relay. As an interface to a network, frame relay is the same type of protocol as x. This tutorial explains how to configure frame relay step by step. Get 30% discount on all your purchases at this is one time offer. In this tutorial ill explain to you why we use d frame relay and how it works.
Comprehensive guide to configuring and troubleshooting frame. Issue the show frame relay pvc command on r1 and r3. This conversion contains the necessary instructions to eliminate the electronic warning signals on some models. Configure a basic frame relay permanent virtual circuit pvc, including configuring and troubleshooting frame relay on a router serial interface and configuring a static frame relay map. Originally designed for transport across integrated services digital network isdn infrastructure, it may be used today in the context of many other network interfaces. The frame relay map command is used to configure static addresstodlci tables. Frame relay frame relay is a highperformance wan protocol that operates at the physical and data link layers of the osi reference model. Thus, in general, framerelay is less expensive than dedicated wan lines, but customers are not guaranteed bandwidth. It describes specific frame relay symptoms, the problems that are likely to cause each symptom, and the solutions to those problems. Configuring frame relay control bit translation 10. Even though several advanced technologies such as vpn, atm are available today, frame relay still rocks and will be in near future due to its features, benefits and lower cost in comparison with other point to point wan services. It identifies the logical connection that is multiplexed into the physical channel. In figure 33, spans frame relay network uses permanent virtual circuits pvc. A m o n g these factors, the electrical installation is the most important and should always be.
Use the debug framerelay lmi command to verify the operational status of the router and the frame relay switch. Jul 21, 2005 troubleshoot problems with frame relay circuits on your cisco router by david davis ccie in networking on july 21, 2005, 12. As the administrator, you are responsible for configuring frame relay among regional offices. Frame relay services section, then the frame relay services section applies instead of the general terms, to the extent of the inconsistency. Frame relay digital service unit users manual installation. In the basic not extended by the lmi mode of addressing, dlcis. Relay locations relays are located throughout the entire vehicle. Click on the links below to get to the proper section. Mar 29, 2011 troubleshooting frame relay, ppp and hdlc wan connections. The ultimate goal of a frame relay network is to enable hosts on a lan communicate with hosts on remote lans.
After configuring frame relay pvc and you are troubleshooting network issue, verify that frame relay is operating correctly on that interface using the show interfaces interface number command. However, if problems arise in the frame relay network, proven techniques can be applied to isolate and solve them. Cisco confidential troubleshoot frame relay troubleshooting frame. Frame relay is one of the most popular wan service deployed over the past decade. Of course, useful troubleshooting information, such as the dlci, the name of the. From 199197 all models and 200010 crown victoria and. This frame is very similar to the hdlc frame except for the missing control field here. Home downloads download cisco ccnp routing pdf study guide. The frame relay, frame relay lmitype, and frame relay inversearp commands are used to configure frame relay. Frame relay troubleshooting if a framerelay dlci attains a state other than active meaning inactive or deleted, you can check the framerelay configuration to make sure its configuration matches the configuration of the router acting as the framerelay dte device.
Supported mqc frame relay traffic shaping commands 194. Configure a frame relay subinterface background scenario frame relay is a highperformance wan protocol that operates at the physical and data link layers of the osi reference model. This should not cause problems since arp does not rely on these fields and in fact. Rfc 2427 multiprotocol interconnect over frame relay ietf tools. Once a frame relay line has been properly provisioned by the provider, the installation of a frame relay network using cisco routers is usually a troublefree task involving minimal configuration. Drill a 6mm hole in an unused location on the frame for the walkaway relay figure 20b. Cable a network that is similar to the one in the topology diagram. All locations plug into the frame relay cloud, which is a conglomeration of dozens or hundreds of framerelay switches and routers.
Framerelay is one of the wan protocols you need to understand if you plan to become ccna certified. For any troubleshooting attempt to be successful, you need to have a good understanding of the technology, so you may want to spend some time reading the first article about frame. Install the walkaway relay using the 6mmx20 bolt, lock washer, walkaway relay, lock washer 2 and nut. Basic concepts of frame relay explained in easy language. Ccna portable command guide, 2nd edition cisco press. Traffic is translated by a protocol converter that provides communication among dissimilar. Be sure to change your cabling to reflect the topology diagram. Frame relay troubleshooting the frame switch ine blog. In general, the moss motors video site and mg guru site have excellent technical articles. Frame relay is a scalable wide area network solution which makes use of packetmode transmission. Follow the steps listed below to troubleshooting a connectivity problem involving frame relay on a cisco router. This is not an electrical relay it is a purely mechanical device utilizing either one, or two levers depending on how the parking brake is configured. Chapter 18 troubleshooting frame relay connections frame relay technology basics figure 181 the frame relay frame the 10bit dlci value is the heart of the frame relay header. In fact, you can think of frame relay as a way of utilizing existing t1 and t3 lines owned by a service provider.
The operation of a normally closed relay is the same to that of a normally open relay, except backwards. This lever relay is located on the driver side frame rail, near the transmission. Most telephone companies now provide frame relay service for customers who want connections at 56 kbps to t1 speeds. Subbase and amplifier are required to complete the system. Compare this to the physical path used by a dedicated connection. The physical component defines the mechanical and electrical specifications for the connection between the devices. Frame relay is a highperformance wan protocol that operates at the physical and data link layers of the osi reference model. Frame relay is a standardized wide area network technology that specifies the physical and data link layers of digital telecommunications channels using a packet switching methodology. Its also one of the most difficult protocols to understand for most ccna students.
Relays are often grouped together or with other components like. Congestion control in frame relay basic working mechanisms. Frame relay is one of the wan protocols you need to understand if you plan to become ccna certified. The frame relay protocol allows network designers to reduce costs by using shared facilities that are managed by a frame relay service provider. Frame relay allows for a single serial interface on the router to connect multiple remote sites with the help of virtual circuits. The cloud is the frame providers network, and the customer has no control or even. Perform these steps for the local and remote router. Digital service unit users manual installation guide pub. Troubleshooting frame relay connections cisco systems.
The show interfaces command displays how the encapsulation is set up, along with useful layer 1 and layer 2 status information, including. Drill a 4mm hole in an unused location on the frame for the walkaway fuse figure 20a. The frame relay is the packet switched network as well as it may compare with the x. In frame relay implementation, the connection between a dte router device and a dce frame relay switch device consists of both a physical layer component and a link layer component. The flags fields delimit the beginning and end of the frame. The three wan topologies used to interconnect remote sites are star, partialmesh, and fullmesh. Both frame relay beginners, who need to understand the technology, and advanced readers, who need information on the wide range of frame relay features cisco offers, will benefit from this book. However, cisco frame relay solutions guide is a useful design, implementation, and configuration guide for networking professionals of all levels. Users pay fixed charges for the local connections from each site in the frame relay network to the first point of presence pop in which the provider maintains a frame relay switch. You can configure backtoback frame relay between two routers connected directly via a serial link without any frame relay switch in between. Ten bits of these 2 bytes make up the actual circuit id called the dlci, for data link connection identifier. Troubleshoot problems with framerelay circuits on your cisco. Ec7840l relay module 66202704 4 a the rm7840 must have an earth ground providing a connection between the subbase and the control panel or the equipment. Issue the show frame relay map command on r1 and r3.
1474 219 438 57 406 1311 814 356 924 235 773 1363 506 180 845 441 272 476 353 1463 100 1278 1441 817 1015 801 1429 1184 354 616 244 999 127