For example, 1.1.1.1 translates to 1,111 and 2.2.2.2 translates to 2,222 in which case 2,222 is a higher number than 1,111. When referring to a higher IP address, step back and look at the IP address as a whole number. If a router-id is not configured manually in the OSPF routing process the router will automatically configure a router-id determined from the highest IP address of a logical interface (loopback interface) or the highest IP address of an active interface. The Router-ID uniquely identifies a router in an autonomous system, no two routers in an OSPF autonomous system can have the same router-id. As discussed in Lab 9-1, there is a reason for this. In this mode, the switch supports simultaneous tagged and untagged traffic on a port.ĭefines the matching criteria to map 802.In lab 9-1, the process of the Router-ID determination was discussed and through out Section 9 labs when you’ve used the show ip ospf neighbor command and I’m sure you’ve noticed the neighbor id and that it was the IP Address of the neighbors loopback0 interface. Sets the trunk characteristics when the interface is in trunking mode. Sets the IP address of or more DNS servers that the device can use to resolve hostnames to IP addresses. Show running-config interface interface slot/numberĭisplays the running configuration for the specified interfaceĭisplays the status of a network interface as well as a detailed listing of its IP configurations and related characteristics. Sets the default gateway on the Cisco deviceĭisplays the current configuration of the deviceĭisplays the saved configuration stored in the device's NVRAM, which will be loaded when the device starts upĪssigns the specified description to an interface Shuts the interface down (shutdown) or brings it up (no shutdown) Merges the startup config with the currently active config in RAMĪssigns the specified IP address and subnet mask Replaces the startup config with the active config when the Cisco network device initializes Sets a host name to the current Cisco network deviceĬopies files from one file location to another Logs the user into Global Configuration modeĮnters interface configuration mode for the specified fast ethernet interface Privileged exec mode is indicated by the # symbol in the command prompt. Moves a user from user exec mode into Privileged EXEC mode. Global Configuration mode can be further divided into the following command modes, which permit you to configure different components: To use Global Configuration mode, you first need to enter Privileged EXEC Mode and then execute the configure terminal command although numerous shortcuts are accepted such as config t. While Exec and Privileged Exec are read-only modes, Global Configuration mode gives the user writable access to modify the active configuration file. Global Configuration mode: Global configuration commands apply to features that affect the device as a whole.Privileged exec mode - This mode provides access to all commands, enabling more detailed examination and control of the device's operation and configuration.For instance, this mode enables you to view status using certain show commands but does not enable you to view or edit configurations. It provides limited access to commands and configuration settings. User exec mode - This mode is the mode you land in when you first log onto a Cisco device.The key most common modes are the following: For instance, Setup Mode provides the user with an interactive menu guide the user to create an initial configuration file for the device. Each mode serves a slightly unique purpose. The commands are organized into the following groups:Ĭisco IOS has several command modes that fall into further categories such as operational and configuration. Being familiar with the basic Cisco console commands will aid network administrators in managing Cisco devices efficiently and in line with best practices. It includes the list of Cisco switch commands, a Cisco router commands list and Cisco network commands. This article provides a Cisco commands cheat sheet, outlining the most common Cisco IOS commands for configuring, securing and troubleshooting Cisco network equipment. For professionals working with these systems, knowing the right commands is crucial. Cisco IOS is the backbone software that powers many of Cisco's network devices.
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