How many times have you locked yourself out of your device? In my professional career, this happened to me several times when I was either configuring AAA or making any routing related changes. Usually, the reason for this is the human error associated with invalid configuration. Some vendors offer a commit model that allows you to apply the configuration and then save it to the system by committing the change. As we know not all vendors offer the commit model approach and when a change is introduced in the system, such a change is pushed immediately. This approach means that sometimes, as a result of an erroneous change, we may lose access to the device, create loops, shutdown the interface we didn’t want, etc. In such a situation, we often have to use the console to gain access back to the device, if we have one, in the worst case, if the configuration has not been saved to the device, we can ask someone who has physical access to the device to reboot the device.Continue reading
In this post I would like to show you some useful commands available on the Arista switches that you can use in your daily work.
The first command that is very useful is the watch command, which repeats the given command at a specified interval and can additionally display the differences between individual performances.
For example, if we want to monitor CRC errors on a given interface, instead of repeating the show int x / x several times, we can use the watch command, which will run the above mentioned command automatically every 2s and display information as shown below.Continue reading