When buying a Cisco Switch from Ebay…

Whenever I buy a switch off of Ebay, I always check all the switch ports if they are working or not.
The way I do it, I use the router’s fastethernet port and connect it to each switch port then I will ping the switch’s vlan ip address from the router.  If I get “!!!!!”, then the port is working fine.  If I get the “…..”, then the port is either dead or has problem.

The thing is if the switch has 24 or 48 ports it will take some time to check all ports, so what I always do I added some extra configuration on the switch.

Switch#configure terminal
Switch(config)#int vlan 1
Switch(config-if)#ip address
Switch(config-if)#no shutdown
Switch(config)#interface range fastethernet 0/1 – 48
Switch(config-if-range)#switchport mode access
Switch(config)#spanning-tree portfast default
Switch(config)#interface vlan 1

On the router, I just address the ip address on fastethernet 0/0 then ping each switch ports. With portfast configure, I can ping the switch port once I connect the network cable to each port.

It took me less than five minutes to verify all the 48 ports 🙂

Hope this helps

About networkshinobi

My name is Karlo, I work as a Network Engineer. A little about myself. I started as a PC gamer back when I was in high school. PC gaming became my addiction and pushed me to learn more about computers. Slowly got my some certifications and landed an IT Tier 1 Helpdesk job. This job opened the door for me to work to push further on my certifications and going deeper into the IT world. My goal was to get my Cisco CCIE Routing and Switching, but my journey for CCIE has changed due to I always ended up working on non-Cisco network appliances. Therefore, I have to pivot and decided to jump to the dark side and go with Juniper. Hopefully, I would get my JNCIE in the near future. All the entries/post I made are based on my views, opinion and for educational purposes only. If you see some mistakes, feel free to drop some comments. I would appreciate all the helpful comments. Thanks
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