Problem Statement and Architecture for Information Exchange Between Interconnected Traffic Engineered Networks
2016
In Traffic-Engineered (TE) systems, it is sometimes desirable to
establish an end-to-end TE path with a set of constraints (such as
bandwidth) across one or more networks from a source to a destination.
TE information is the data relating to nodes and TE links that is used
in the process of selecting a TE path. TE information is usually only
available within a network. We call such a zone of visibility of TE
information a domain. An example of a domain may be an IGP area or an
Autonomous System. In order to determine the potential to establish a
TE path through a series of connected networks, it is necessary to
have available a certain amount of TE information about each network.
This need not be the full set of TE information available within each
network but does need to express the potential of providing TE
connectivity. This subset of TE information is called TE reachability
information. This document sets out the problem statement for the
exchange of TE information between interconnected TE networks in
support of end-to-end TE path establishment and describes the best
current practice architecture to meet this problem statement. For
reasons that are explained in this document, this work is limited to
simple TE constraints and information that determine TE reachability.
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