Because the Octal cable is rolled, youcan connect each cable directly to the RJ-45 console port of each lab router.However, some routers have console ports that are 25-pin interfaces instead ofRJ-45. DTE-to-DCEdevices require a straight-through cable. DTE-to-DTE connections require a rolled (null modem) cable. The async ports from the 68-pin connector are data terminal equipment (DTE)devices. See Figure 4-14 for an example.įigure 4-14Terminal Server Connectivity to Lab Routers So, R1 is attached to async 2001, R2 is connected to 2002, and so on up to2007, which is connected to the Catalyst 1900 switch, leaving 2008 unused. Each line is numbered beginning with 2001 to2008. For configurationpurposes, each rolled cable is referred to as an asynchronousline in the configuration. Each RJ-45 rolled cableis connected to the console port of each router in the lab. The 68-pin connectoris attached to Interface Async 1 of the terminal server. It provides eight RJ-45 rolledcable asynchronous (async) ports on each 68-pin connector. This cable is referred to as a CAB-OCTAL-ASYNC cable or just OCTAL cable. The Cisco 2511 series router uses a 68-pin connector and breakout cable (see Figure 4-13). To get a better idea of what the ports look like on the back of a terminal server, see Figure 4-12, which shows the back of a Cisco 2511.įigure 4-12A Cisco 2511 to Be Configured as the Lab Terminal Server Cabling Generally, a terminal serveris a router with multiple, asynchronous ports that are connected to otherdevices, such as the console port of other routers or switches, as shownpreviously in Figure 4-8.

Terminal Server OverviewĪ terminal server provides out-of-band access for several devices.Out-of-band access is through a router's console or aux port versus in-bandaccess that occurs over the network using telnet. Portassignments are as follows:Īfter completing this objective, you will learn how to maneuver from theterminal server to each individual lab router and then back to the terminalserver. In this chapter, you will accomplish the following lab objective:Ĭonfigure the Cisco 2511 router to be the terminal server for this lab.The terminal server is connected to each device's console port. Once configured, you will be ableaccess each lab router's console port through reverse Telnet. This section demonstrates how to configure a terminal server to provideaccess to the rest of the routers in the lab.

Create loopback cable rj45 step by step