IOS




How to clean up old images on IOS XE

Problem If you ever run into the following error messages: %Error copying usbflash0:cat3k_caa-universalk9.SPA.03.06.04.E.152-2.E4.bin (Not enough space on device) or % flash: requires 295884 KB of free space, but only 167160 KB is available. Operation aborted. You’ve run out of disk…


How to show hidden default Cisco IOS configurations

Where did my “switchport access vlan 1” command go? Have you ever noticed that Cisco has loaded default configurations onto the switch without showing it on your startup or running config? “switchport access vlan 1” is a good example. Take…


How to setup a simple Cisco IOS Firewall

Classic Firewall There are two configuration models to setup a firewall on IOS; the classic firewall (used to be called CBAC – Context based access control) and the zone based firewall. In this post I’m going to document how to…


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NEW Cisco IOS method for configuring Radius Server

Setting up Radius using the old IOS cli If you entered the following for setting up radius server, radius-server host 192.168.1.1 you will get the following warning message informing you that you there is a new way of configuring radius…



Cisco IOS schedule automatic configuration backup

Backing up a Cisco router or switch configuration is crucial for any network administrator. Wouldn’t it be useful if you could schedule an automatic configuration backup to an offline location? Or backup your configuration automatically to an offline location whenever…


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Cisco IOS backup config via SSH!

Did you know you can backup your running-config or startup-config via ssh? I’ve been backing up configurations via TFTP for a long time but only recently started using SSH. Here’s how to do it. If you have a Linux/Unix server…