A new Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Protocol Extension Requirement for Cooperation between PCE and Distributed Routing Controller in GMPLS Networks
Author(s) : Y. Zhao, et al
Filename : draft-zhaoyl-pce-dre-02.txt
Pages : 14
Date : 2011-04-20
Path Computation Element (PCE) is proposed for path computation in
multi-layer and multi-domain networks where PCE can be implemented in
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 providing
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 and distributed network control in
local domain. A cooperative path computation architecture named Dual
Routing Engine (DRE) is necessary in the future networks, for it
based on the two path computation engines and can take the advantages
of both centralized and distributed method. The corresponding PCE
communication protocol extension and other protocol requirements for
cooperation between PCE and distributed routing controller are listed
in this document.
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