[mpls] I-D Action: draft-ietf-mpls-rsvp-shared-labels-00.txt

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Subject: [mpls] I-D Action: draft-ietf-mpls-rsvp-shared-labels-00.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Multiprotocol Label Switching WG of the IETF.

        Title           : Signaling RSVP-TE tunnels on a shared MPLS forwarding plane
        Authors         : Harish Sitaraman
                          Vishnu Pavan Beeram
                          Tejal Parikh
                          Tarek Saad
	Filename        : draft-ietf-mpls-rsvp-shared-labels-00.txt
	Pages           : 21
	Date            : 2017-12-18

   As the scale of MPLS RSVP-TE networks has grown, so the number of
   Label Switched Paths (LSPs) supported by individual network elements
   has increased.  Various implementation recommendations have been
   proposed to manage the resulting increase in control plane state.

   However, those changes have had no effect on the number of labels
   that a transit Label Switching Router (LSR) has to support in the
   forwarding plane.  That number is governed by the number of LSPs
   transiting or terminated at the LSR and is directly related to the
   total LSP state in the control plane.

   This document defines a mechanism to prevent the maximum size of the
   label space limit on an LSR from being a constraint to control plane
   scaling on that node.  That is, it allows many more LSPs to be
   supported than there are forwarding plane labels available.

   This work introduces the notion of pre-installed 'per Traffic
   Engineering (TE) link labels' that can be shared by MPLS RSVP-TE LSPs
   that traverse these TE links.  This approach significantly reduces
   the forwarding plane state required to support a large number of
   LSPs.  This couples the feature benefits of the RSVP-TE control plane
   with the simplicity of the Segment Routing MPLS forwarding plane.

   This document also introduces the ability to mix different types of
   label operations along the path of an LSP, thereby allowing the
   ingress router or an external controller to influence how to
   optimally place a LSP in the network.

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