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RFC 8577
Title: Signaling RSVP-TE Tunnels on a
Shared MPLS Forwarding Plane
Author: H. Sitaraman,
V. Beeram,
T. Parikh,
T. Saad
Status: Standards Track
Stream: IETF
Date: April 2019
Mailbox: [email protected],
[email protected],
[email protected],
[email protected]
Pages: 24
Characters: 50113
Updates/Obsoletes/SeeAlso: None
I-D Tag: draft-ietf-mpls-rsvp-shared-labels-09.txt
URL: https://www.rfc-editor.org/info/rfc8577
DOI: 10.17487/RFC8577
As the scale of MPLS RSVP-TE networks has grown, 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 the amount of control-plane state
information.
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. It introduces the notion of preinstalled
'per-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 (SR) MPLS forwarding plane.
This document is a product of the Multiprotocol Label Switching Working Group
of the IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
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