This is the human-readable name assigned to the pairing of a forward and reverse unidirectional GMPLS LSP that together form one logical bidirectional (associated) tunnel, 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 'DAL-ATL-BKP-01', instantly telling an on-call engineer which link an alarm refers to without having to cross-reference index numbers.