A New Internet-Draft is available from the on-line Internet-Drafts
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Title : Path Computation in Multiple Autonomous Systems Networks with Path Computation Element
Author(s) : H. Xia, D. Li
Filename : draft-xia-pce-hybrid-network-00.txt
Pages : 9
Date : 2007-7-3
The Path Computation Element (PCE) provides functions of path
computation in support of traffic engineering in Multi-Protocol Label
Switching (MPLS) and Generalized MPLS (GMPLS) networks.
One key application of the PCE-based architecture is the computation
of inter-domain Traffic Engineering Label Switched Path (TE-LSP)
paths(i.e. inter-area, inter-AS, inter-provider, etc.). In this case,
cooperation between PCEs is desirable due to the partial topology
visibility available to each separate PCE. Per-domain path
computation is another method that can be used to determine paths for
inter-domain TE-LSPs when PCE cooperation is not applied in the
network.
In practice, some Service Providers may choose not to implement PCEs
within their network that can cooperate with PCEs that are outside
their network. In this case, a scenario may exist where an LSP spans
multiple autonomous systems (ASes), some of which have PCEs capable
of cooperation with external PCEs and some of which do not. For
example, some ASes may be PCE-enabled, while others consist of just
normal LSRs.
Another scenario arises if a PCE fails or becomes unreachable. This
gives rise to the same lack of inter-PCE cooperation.
Both cases are named Hybrid PCE Networks in this document. This
document describes the specific issues introduced for end-to-end path
computation in Hybrid PCE Networks and defines extensions to the PCE
Communication Protocol (PCEP) to perform inter-domain LSP computation
in Hybrid PCE Networks.
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