![]() ![]() show mac address-table dynamic – Display only learned MAC addresses.By default this command shows the full contents of every VLAN that traverses the switch so I recommend you filter the output with one of the following variations: This command shows all MAC addresses the switch is aware of and each address’ associated VLAN and physical port. To see sample output from this command, just click the section header above. This command is probably the one I use most because it shows Layer 1, Layer 2, and Layer 3 interface status all in one screen. Just scroll down to the bottom and click on one of the images to see what these commands do. Update: I created a slideshow of sample output from all these commands. If you’d like a quick reference of these commands for your desk just click here! Update 2: I also put this information into a PDF. ![]() If you don’t see your favorite commands for Cisco switch troubleshooting here please let me know and I’ll add them! I thought a “cheat sheet” of common Cisco troubleshooting commands handy might speed his network troubleshooting so I put this list together for him. The IT Director for this particular company is a one-man IT shop who doesn’t get to work with Cisco’s command line interface very often. Last month I had the pleasure of helping a client upgrade their Cisco network infrastructure.
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