This article is explain How to Access Cisco Catalyst & Switch CLI , Cisco catalyst switches & Accessing the cisco IOS CLI.
Cisco uses the concept of a command-line interface (CLI) with its router products and most of its Catalyst LAN switch products. The CLI may be a text-based interface during which the user, typically a network engineer, enters a text command and presses Enter. Pressing Enter sends the command to the switch, which tells the device to do something. The switch does what the command says, and in some cases, the switch replies with some messages stating the results of the command.
Cisco Catalyst switches also support other methods to both monitor and configure a switch. for instance , a switch can provide an internet interface, so that an engineer can open an internet browser to connect to an internet server running within the switch. Switches can also be controlled and operated using network management software. This book discusses only Cisco Catalyst enterprise-class switches, and especially , the way to use the Cisco CLI to watch and control these switches. This first major section of the chapter first examines these Catalyst switches in additional detail, then explains how a network engineer can get access to the CLI to issue commands.
Also Read : How can we Cabling the Console Connection
Cisco Catalyst Switches
Within the Cisco Catalyst brand of LAN switches, Cisco produces a good sort of switch series or families. Each switch series includes several specific models of switches that have similar features, similar price-versus-performance trade-offs, and similar internal components. for instance , at the time this book was published, the Cisco 2960-X series of switches was a current switch model series. Cisco positions the 2960-X series (family) of switches as full-featured, low-cost wiring closet switches for enterprises. meaning that you simply would expect to use 2960-X switches as access switches during a typical campus LAN design. Chapter 10, “Analyzing Ethernet LAN Designs,” discusses campus LAN design and therefore the roles of various switches.
Figure 6-1 shows a photograph of 10 different models from the 2960-X switch model series from Cisco. Each switch series includes several models, with a mix of features. for instance , a number of the switches have 48 RJ-45 unshielded twisted-pair (UTP) 10/100/1000 ports, meaning that these ports can auto negotiate the use of 10BASE-T (10 Mbps), 100BASE-T (100 Mbps), or 1000BASE-T (1 Gbps) Ethernet.
Cisco refers to a switch’s physical connectors as either interfaces or ports, with an interface type and interface number. The interface type, as used in commands on the switch, is either Ethernet, Fast Ethernet, Gigabit Ethernet, then on for faster speeds. For Ethernet interfaces that support running at multiple speeds, the permanent name for the interface refers to the fastest supported speed. for instance , a 10/100/1000 interface (that is, an interface that runs at 10 Mbps, 100 Mbps, or 1000 Mbps) would be called Gigabit Ethernet regardless of what speed is currently in use. To uniquely number each different interface, some Catalyst switches use a two-digit interface number (x/y), while others have a three-digit number (x/y/z). as an example , two 10/100/1000 ports on many older Cisco Catalyst switches would be called Gigabit Ethernet 0/0 and Gigabit Ethernet 0/1, while on the newer 2960-X series, two interfaces would be Gigabit Ethernet 1/0/1 and Gigabit Ethernet 1/0/2, for instance .
Accessing the Cisco IOS CLI
Like any other piece of hardware , Cisco switches need some kind of OS software. Cisco calls this OS the Internetwork OS (IOS). Cisco IOS Software for Catalyst switches implements and controls logic and functions performed by a Cisco switch. Besides controlling the switch’s performance and behavior, Cisco IOS also defines an interface for humans called the CLI. The Cisco IOS CLI allows the user to use a terminal emulation program, which accepts text entered by the user. When the user presses Enter, the terminal emulator sends that text to the switch. The switch processes the text as if it’s a command, does what the command says, and sends text back to the terminal emulator. The switch CLI are often accessed through three popular methods—the console, Telnet, and Secure Shell (SSH). Two of those methods (Telnet and SSH) use the IP network during which the switch resides to reach the switch. The console may be a physical port built specifically to permit access to the CLI. Figure 6-2 depicts the choices.
Console access requires both a physical connection between a PC (or other user device) and the switch’s console port, as well as some software on the PC. Telnet and SSH require software on the user’s device, but they rely on the existing TCP/IP network to transmit data. The next few pages detail how to connect the console and set up the software for each method to access the CLI .
Questions related to this topic
- What is IOS command line interface?
- How do I show interfaces on a Cisco switch?
- How upgrade Cisco switch IOS via console cable?
- What CLI command is used to enable or activate an interface on a Cisco router?
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