Normally, an L3 switch can be configured to route or not to route (e.g. ip routing / no ip routing). Some models/series have routing activated by default, some have it deactivated. Additionally, the IP status (show ip) should show its routing status.

IP Routing : Enabled

All of those are missing on an L2 switch.

Apart from CLI, the CDP and LLDP frames sent out should show its capabilities (bridge, router) whether active or not. You should be able to display the local CDP info using something along show cdp tlv - look out for Capabilities: Router.

Normally, an L3 switch can be configured to work as a router (forward traffic between IP subnets) or not, e.g. ip routing / no ip routing. Some models/series have routing activated by default, some have it deactivated. Additionally, the IP status (show ip) should show its routing status.

IP Routing : Enabled

On an L2 switch you won't see this option or status.

Apart from CLI, the CDP and LLDP frames sent out should show its capabilities (bridge, router) whether active or not. You should be able to display the local CDP info using something along show cdp tlv - look out for Capabilities: Router.

And of course, you can display the device model (show system) and look up its features. If applicable, check the license as JFL has pointed out.

Normally, an L3 switch can be configured to route or not to route (e.g. ip routing / no ip routing). Some models/series have routing activated by default, some have it deactivated. Additionally, the IP status (show ip) should show its routing status. All of those are missing in an L2 switch.

Apart from CLI, the CDP and LLDP frames sent out should show its capabilities (bridge, router) whether active or not.

Normally, an L3 switch can be configured to route or not to route (e.g. ip routing / no ip routing). Some models/series have routing activated by default, some have it deactivated. Additionally, the IP status (show ip) should show its routing status.

IP Routing : Enabled

All of those are missing on an L2 switch.

Apart from CLI, the CDP and LLDP frames sent out should show its capabilities (bridge, router) whether active or not. You should be able to display the local CDP info using something along show cdp tlv - look out for Capabilities: Router.