Creating Virtual Machine on Virtualbox is very easy. First what you need of course is to have Virtualbox installed, here is link for Downloading it for your system https://www.virtualbox.org/wiki/Downloads After installing and running Virtualbox, you will see something like this With button New (1) you will open windows for creatingnew VM (VM means Virtual Machine). Creating new VM windows looks something like this, in first line you can add name to VM Here you can choose folder for your VM, there will be stored its virtual hard drive and necessary files Then you can choose type of OS what you want to install on your VM Next you can choose version of OS Click next. Now you will see Memory windows, where you need to add memory for VM. Click next. Now you need to create new Hard Disk for VM. Here you have choose to create new, add existing or with no Hard Disk, in our case you need check “Create a virtual hard disk now” Click create. Choose “VDI (Virtual Disk Image)” and click next.
Enable Portfast on Cisco switch port Switch>en Switch#conf t Switch(config)#int fa 0/24 (interface number) Switch(config-if)# spanning-tree portfast %Warning: portfast should only be enabled on ports connected to a single host. Connecting hubs, concentrators, switches, bridges, etc... to this interface when portfast is enabled, can cause temporary bridging loops. Use with CAUTION %Portfast has been configured on FastEthernet0/24 but will only have effect when the interface is in a non-trunking mode. Switch(config-if)#do wr Building configuration... [OK] Switch(config-if)#exit Portfast CLI command This notes are for everyone, who will find them helpful. Comments, questions, corrections are Welcome.