Feel free to use any combination of routers as long as you fulfill the topology diagram as shown in Figure 6-1. It is not compulsory to use the same model of routers, but this will make life easier should you like to load configurations directly from the CD-ROM into your own devices. Figure 6-1. Lab 6 Topology DiagramNOTE If you have a mix of 10- and 100-Mbps Ethernet interfaces, adjust the bandwidth statements on the relevant interfaces to keep all interface speeds common. This will ensure that you do not get unwanted behavior because of differing IGP metrics. You will find some routers using a mix of 10- and 100-Mbps Ethernet interfaces. Lab TopologyPractice Lab 6 will use the topology as outlined in Figure 6-1, which you will need to create using the switch, Frame Relay, ATM, and ISDN information that follows. Cabling InstructionsYou will have all the router interfaces precabled, although you will not be using all interfaces for the Lab 6 exercises. Table 6-2 documents the cabling instructions.
Frame Relay Switch InstructionsThe Frame Relay switch is a 4000 router with 12 interfaces connecting all 6 core routers in a full mesh as shown in Table 6-3. Refer also to Figure 6-2 for the Frame Relay logical assignment and refer to the Frame Relay sample configuration from the CD-ROM.
Figure 6-2. Frame Relay Switch Logical ConnectivityConfigure a 4000 router as a Frame Relay switch or equivalent that can provide the connectivity for this lab. Keep your DCE cables at the frame switch end for simplicity and provide a clock rate of 2 Mbps to all links. Should you require detailed information on how to configure one of your routers as a Frame Relay switch, this information can be found in Appendix A, "Frame Relay Switch Configuration" (and/or from the CD-ROM). NOTE If you do not have a spare router to make up as your Frame Relay switch with 12 serial interfaces, you certainly can accommodate your needs with a smaller router for each specific lab exercise or even make back-to-back connections in some situations. ATM Switch InstructionsYou will have a back-to-back connection between R6 and the backbone router using fibers, as shown in Figure 6-3. Figure 6-3. ATM Physical ConnectivityFigure 6-4 shows the logical setup for the ATM connectivity. You should always pay attention to the PVCs that you are going to use. Figure 6-4. ATM Logical ConnectivityThe ATM connectivity in Lab 6 will be provided by a back-to-back connection between R6 and (the) BB_Router over E3 ATM interfaces. You could also use a Cisco LightStream (LS1010 Switch) if available. Configure the PVCs as requested during the lab exercise. If you are using a LightStream to provide your ATM connectivity and require information on how to set this up, this information can be found in Appendix B, "LS1010 ATM Switch Configuration." NOTE Although you are working with a back-to-back PVC environment as opposed to using an ATM switch such as a LS1010, you should consider studying other possible ATM configurations such as ATM SVC, PPPoATM, and so forth. ISDN InstructionsConnect R3 and R5 into either ISDN lines or an ISDN simulator. It is preferable that the ISDN supports command-line interface (CLI). Reconfigure the numbers as required if you are using live ISDN lines. Figure 6-5 illustrates the ISDN connectivity. Figure 6-5. ISDN ConnectivityIP Address InstructionsConfigure the IP addresses as shown in Figure 6-6. Figure 6-6. IP Addressing DiagramThe CD-ROM includes initial configuration files for all routers and switches that include the basic IP addressing as shown in Figure 6-6. |