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.
