This is the human-readable name assigned to a statically provisioned, unidirectional GMPLS tunnel that simply passes through this device as a mid-path (transit) node, without originating or terminating here, as opposed to its internal numeric index. Engineers refer to this label in CLI show commands, syslog messages, and alarm text instead of the raw tunnel index, so a clear naming scheme here is what turns a numeric LSP into something a technician can find quickly during a night-shift incident. A tunnel connecting two data centers might carry the name 'BOS-DC-LSP-02', instantly telling an on-call engineer which link an alarm refers to without having to cross-reference index numbers.