>that says in the line of configuration of interface:   (Switch(config-if)#)   As @BrechtSchamp  says, the 3560G does not support 30W of output, so that is why the command is being rejected.  You would have needed a Cisco 3560-X.   Cisco stopped selling the Cisco 3560G back in 2013 - so your switch is at least 6 years old. https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-series-switches/eol_c51-696372.html You could get a nice new shiny Cisco Meraki switch to bring your infrastructure up to date ... https://meraki.cisco.com/products/switches ... View more