A Backward Recursive PCE-initiated inter-domain LSP Setup

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Last updated 2017-09-14 (latest revision 2017-03-13)
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The Path Computation Element (PCE) working group (WG) has produced a set of RFCs to standardize the behavior of the Path Computation Element as a tool to help MPLS-TE, GMPLS LSP tunnels and Segment Routing paths placement. This also include the ability to compute inter-domain LSPs or Segment Routing path following a distributed or hierarchical approach. In complement to the original stateless mode, a stateful mode has been added. In particular, the new PCInitiate message allows a PCE to directly ask a PCC to setup an MPLS-TE, GMPLS LSP tunnels or a Segment Routing path. However, once computed, the inter-domain LSPs or Segment Routing path are hard to setup in the underlying network. Especially, in operational network, RSVP-TE signaling is not enable between BGP border routers. But, such RSVP- TE signaling is mandatory to setup contiguous LSP tunnels or to stitch or nest independent LSP tunnels to form the end-to-end inter- domain LSP tunnels. This draft propose to combine a Backward Recursive method with PCInitiate message to setup independent LSP tunnels per domain and stitch or nest the different LSP tunnels to setup end-to-end inter-domain LSP tunnels without the need of inter- domain signaling between BGP border routers. A new Stitching Label definition and new LSP-TYPE code points are proposed for that purpose.


Olivier Dugeon (olivier.dugeon@orange.com)
Julien Meuric (julien.meuric@orange.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)