@moviebox On EXOS switches, MAC addresses won’t populate in the FDB unless the device is actively passing traffic on that VLAN, so if the PC or printer isn’t generating traffic and isn’t a member of any data VLAN, the MAC simply won’t show up. Since you’ve removed ports from the default VLAN and only have VOIP configured, the switch only learns the phone MACs. Try temporarily adding the access ports back to a data VLAN and generate traffic, then run `show` or `show mac-address-table` again. Also, checking the official Extreme documentation online through the provided URL can help confirm the exact command for the 5420 series.
