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Abstract:
Path Computation Element (PCE) is proposed for path computation in
multi-layer and multi-domain networks where PCE can be implemented in
either centralized method or distributed method. In the former case,
PCE can serve tens or hundreds of nodes simultaneously, while in the
later case, each node is equipped with a PCE, which can be regarded
as a distributed routing controller (DRC) in GMPLS networks and each
one of those provides similar path computation capability. PCE and
DRC have different advantages in path computation respectively. PCE
is suitable for cross-layer and cross-domain path computation,
especially in multi-constraints environment. But distributed routing
controller is good at path computation in parallel ways and
distributed network control in local domain. A cooperative path
computation architecture named Dual Routing Engine (DRE) is necessary
to be used in the future networks, for it based on the ideas of the
cooperation of these two types of path computation engines and can
take the advantages of both centralized and distributed method by
which the PCE is implemented. The corresponding PCE communication
protocol extension and other protocol requirements for cooperation
between PCE and distributed routing controller are listed in this
document to recommend the standard interfaces between different
components in DRE architecture.
Authors:
Yongli Zhao <yonglizhao@bupt.edu.cn>
Jie Zhang <lgr24@bupt.edu.cn>
Ruiquan Jing <jingrq@ctbri.com.cn>
Dajiang Wang <wang.dajiang@zte.com.cn>
Xihua Fu <fu.xihua@zte.com.cn>
(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid)
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