Distributed traffic engineering route exchanger routers (TE-Xs) are used
in an open shortest path first (OSPF) routing area to collect Traffic Engineering
Link State Advertisements (TE-LSAs) and exchange the TE-LSAs with other TE-Xs.
TE-Xs store TE-LSAs and compute explicit routes required by edge routers. A single
point of failure that exists when a single centralized TE database is used is thereby
eliminated. The TE-Xs peer with other TE-Xs in a routing area and exchange TE-LSAs
to keep traffic engineering link state databases (TE-LSDBs) synchronized. Network
resources are preserved for payload traffic and resource reservation collisions
are reduced.