Regarding the MTU command configuration issue on the interface

Regarding the MTU command, does the mtu command configure L3 MTU or L2 MTU? Or does it include both L2 and L3 MTUs?

Command mtu: Default value is 1500. After modifying this parameter, it takes effect for all transport layer payload lengths, regardless of whether the payload is IPv4, IPv6, or other non-IP protocols. 

Command ip mtu: No default value. After modifying this parameter, it applies to the link layer payload length of IPv4 packets. Its precedence is higher than the MTU parameter value and is not displayed in the output of the `display interface` command (the `display interface` output only shows the MTU value). 

Command ipv6 mtu: No default value. After modifying this parameter, it applies to the link layer payload length of IPv6 packets. Its precedence is higher than the MTU parameter value and is not displayed in the output of the `display interface` command (the `display interface` output only shows the MTU value).