Show processes memory

The show memory exec command is often used to check the amount of a router’s free memory. In troubleshooting cases where router performance is the focus, this is a major command used to see the statistics about the router’s memory. To show…
Configure logging in Cisco IOS

Knowing how to properly use logging is a necessary skill for any network administrator, and the Cisco IOS offers many options for logging. Logging can use for fault notification, network forensics, and security auditing. Cisco routers log messages can handle…
Show module command

Show modules: To display the module status and information, use the show module command in user EXEC or privileged EXEC mode. This example shows how to display information for all modules on a Catalyst 6500 series switch that is configured…
Show controllers command

“I’m a little confused on what the “show controllers” commands really do… can someone clarify? Based on the output, I’m inclined to suspect that it provides mostly physical layer type information about an interface. From a troubleshooting perspective, when is…
Show interfaces

Show interfaces: Use the show interfaces EXEC command to display statistics for all interfaces configured on the router or access server. The resulting output varies, depending on the network for which an interface has been configured. show interfaces [type number]…
Show running-config

Show running-config: To display the configuration information currently running on the terminal, use the show running-config EXEC command. This command replaces the write terminal command. Syntax Description: This command has no arguments or keywords. Command Mode: EXEC Usage Guidelines This…
Cisco Show Version Command

Show version: Displays information about the router’s internal components, including the IOS version, memory, configuration register information, etc. The most common use of the show version command is to determine which version of the Cisco IOS a device is running.…
Cisco Show Stacks Command

Show stacks is an exec command that is commonly used to diagnose system crash situations. The first section of this command’s output displays stack utilization of processes and interrupt routines, and the reason for the last system reboot. When a system…
Conditional Route Origination in OSPF Domain

Cisco device uses “default-information originate” statement to generate a default route in OSPF domain. There are two ways to originate default route by using this command: 1) When you configure “default-information originate”  under OSPF process  without any argument after this statement, OSPF process…
Switchport Security & Configuration

One of the most overlooked security areas is the configuration of individual switchport security configuration. The reason may be that it requires a more granular configuration; this is because a typical configuration requires the knowledge of the specific MAC address(es)…
NAC Appliances: Shortcut to Access Control

To share a article about NAC Appliances From https://searchnetworking.techtarget.com/feature/NAC-appliances-Shortcut-to-access-control Infrastructures that check endpoint health before network access have generated plenty of buzz, but precious little deployment. Some companies are waiting for a winner to emerge from the chief contenders: Cisco’s Network Admission…