Hi all, We've submitted a draft for the extensions of PCEP to support associated bidirectional lsp, below is the link: http://tools.ietf.org/html/draft-he-pce-pcep-associated-lsp-extensions-00.
The MPLS-TP requirements [RFC5654] and control plane framework documents[RFC6373]describe that MPLS-TP MUST support associated bidirectional point-to-point LSPs. Path Computation Element (PCE), see [RFC4655], may be used for path computation of a GMPLS LSP,and consequently an associated bidirectional LSP, across domains and in a single domain. As described in http://tools.ietf.org/html/draft-ietf-ccamp-mpls-tp-rsvpte-ext-associated-lsp-02 , the associated bidirectional LSP can be deployed by Single Sided Provisioning model or Double Sided Provisioning model.For the double sided provisioning, the path computation of the forward and the backward LSP are submitted by the head-end and the tail-end separately.For the single sided provisioning, the path computation can be realized by the concurrent or successive computation. The concurrent computation means that the head-end submits the computation request for both two directional LSPs concurrently. As to the successive computation, the head-end and the tail-end send the forward LSP and backward LSP computation requests separately. We have extended PCEP protocol to support the Concurrent computation for Single Sided Provisioning model. Concurrent computation can ensure that the paths for the associated bidirectional LSP is optimal, as described in http://tools.ietf.org/html/rfc5557. In this draft， an A-bit is added to the flag bits of the RP object to indicate the request is about an associated bidirectional LSP or not. futhermore，REVERSE_LSP object is added in a PCReq message to specify the information of the reverse LSP。 Please provide comments and feedback. Thanks Wenjuan
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