Maybe I'm wrong but
interface GigabitEthernet1/1
switchport access vlan 64
switchport trunk native vlan 64
switchport trunk allowed vlan 64
switchport mode access
is a pretty strange interface configuration (read, as example, here).
Is the Interface 1/1 set in Access mode (in Cisco jargon) or is it set with Trunk mode (again, in Cisco jargon)?
You shouldn't have both, Access and Trunk...it is Access or Trunk.
If the Interface 1/1 is set in Access mode (so the switchport mode access is valid) then this would translate into what @Matthew wrote first above:
switch(config)# vlan 64
switch(vlan-64)# untagged 1
or, from the interface 1 standpoint, just the very same:
switch(config)# interface 1 untagged vlan 64
If, instead, your Interface 1/1 is set in Trunk mode (switchport mode trunk) then this translates into:
switch(config)# interface 1 tagged vlan 64
implying that Interface 1 is STILL untagged member of VLAN 1 (Default) but is now tagged member of VLAN 64...so this means it can transport VLAN 64 tagged packets.
Cisco side:
Potentially...you config would be - if interconnecting to Switches and passing JUST one VLAN (your VLAN 64):
interface 1/1
switchport encapsulation dot1q
switchport mode trunk
switchport trunk native vlan 64
switchport trunk allowed vlan 64
With this configuration VLAN 64 will be untagged on Interface 1/1 (note the native) and will also be the only one VLAN allowed to be transported through it (note the allowed) ...but, generally, the Trunk mode is often used when you want a switch interface - logical of physical - to carry MULTIPLE concurrent VLANs between two peer Switches (or between a Switch and a Host capable of VLAN tagging), not just simply one...still that is totally possible.