This setting configures the name of the specific interface the device's TFTP client should use as its source when initiating outbound TFTP transfers, an alternative to specifying a raw source address via hwTftpClientSourceAddress. An administrator sets this to bind TFTP transfers to a particular interface by name, useful when the desired source interface's address might change (such as a DHCP-assigned management interface) but the interface name itself stays constant. For example, setting this to "Vlanif1" ensures the device always initiates TFTP transfers from whatever IP address is currently assigned to that VLAN interface.