Terms and Acronyms

• Generalized Multiprotocol Label Switching (GMPLS)—An extension to MPLS that allows data from multiple layers to be switched over label-switched paths (LSPs). GMPLS LSPs are possible between equivalent Layer 1, Layer 2, and Layer 3 devices. For more information about GMPLS and MPLS, see the JUNOS MPLS Applications Configuration Guide.
• control adjacency—A signaling path between peer devices in a GMPLS network that typically travels across virtual peer interfaces. Protocols are enabled on the control adjacency, which can have one or more associated control channels.
• control channel—The actual interfaces where protocol packets are sent and received by GMPLS peers. If more than one control channel is configured, LMP selects which control channel is active.
• forwarding adjacency—A forwarding path for sending data between peer devices in a GMPLS network.
• GMPLS label—A fiber port, TDM timeslot, DWDM wavelength, or data packet identifier of a GMPLS-enabled device used as a next-hop identifier.
• GMPLS LSP types—There are 4 types of LSPs in a GMPLS network:
  • Fiber-Switched Capable (FSC): LSPs are switched between two fiber-based devices, such as optical cross-connects (OXCs), that operate at the level of individual fibers.
  • Lambda-Switched Capable (LSC): LSPs are switched between two DWDM devices, such as such as OXCs, that operate at the level of individual wavelengths.
  • TDM-Switched Capable (TDM): LSPs are switched between two TDM devices, such as SONET/SDH ADMs.
  • Packet-Switched Capable (PSC): LSPs are switched between two packet-based devices, such as routers or ATM switches.
• Link Management Protocol (LMP)—A GMPLS-related protocol defined in RFC 4204 that is used to define control adjacencies and forwarding adjacencies between peers and to maintain and allocate resources on traffic engineering links (TE links).
• traffic engineering link (TE link)—A logical connection between GMPLS-enabled devices. TE links can have addresses or IDs and are associated with certain resources or interfaces. They also have certain inherent attributes, such as encoding-type, switching capability, and bandwidth. Each TE link represents a forwarding adjacency between a pair of devices.

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