This article will help us with a small hardware testing tool which helps verify whether interface port is working or not. The small testing tool is an RJ45 based Ethernet Testing tool which can be created within minutes by connecting wires as per defined below-
Before that, following are required to make Ethernet Loopback Tester tool
- Cat5 or Cat6 Cable
- Crimping tool
- RJ-45 Connector
Remove the jacket of CAT5/6 Cable and cut out one pair (2 Wires) of approx. 4-5 inch length from total of 4 pairs.
Follow below pin connectivity:
- Pin 1 <-> Pin 3
- Pin 2 <-> Pin 6
Crimp the wires in RJ45 connector through Crimping Tool.
Once the Ethernet Loopback testing tool is ready, let’s verify Ethernet ports on Cisco hardware.
1st, issue “show interface” command to verify the Ethernet port status. By default the interface output should be “Interface is up and line protocol is down”
Next, insert the RJ45 testing tool into interface to be verified
Finally, issue command “show interface” to verify Ethernet port status. The expected output is “Interface is up and line protocol is down”
If the above output is not received, i.e. up/up status, this confirms the interface hardware is malfunctioning.