ABSTRACT
Otherwise, GMPLS functions much like MPLS. LSPs are established by using RSVP-TE or CR-LDP to send a path/label-request message. This message contains a generalized label request, often an ERO, and specific parameters for the particular technology. The generalized label request is a GMPLS addition that specifies the LSP encoding type and the LSP payload type. The encoding type indicates the type of technology being considered, whether it's SONET or Gigabit Ethernet, for example. The LSP payload type identifies the kind of information carried within that LSP's payload. The ERO more or less controls the path that an LSP takes through the network.
