Refresh-interval Independent FRR Facility Protection
draft-ietf-mpls-ri-rsvp-frr-09
MPLS Working Group C. Ramachandran
Internet-Draft T. Saad
Updates: 4090 (if approved) Juniper Networks, Inc.
Intended status: Standards Track I. Minei
Expires: May 26, 2021 Google, Inc.
D. Pacella
Verizon, Inc.
November 22, 2020
Refresh-interval Independent FRR Facility Protection
draft-ietf-mpls-ri-rsvp-frr-09
Abstract
RSVP-TE Fast ReRoute extensions specified in RFC 4090 defines two
local repair techniques to reroute Label Switched Path (LSP) traffic
over pre-established backup tunnel. Facility backup method allows
one or more LSPs traversing a connected link or node to be protected
using a bypass tunnel. The many-to-one nature of local repair
technique is attractive from scalability point of view. This
document enumerates facility backup procedures in RFC 4090 that rely
on refresh timeout and hence make facility backup method refresh-
interval dependent. The RSVP-TE extensions defined in this document
will enhance the facility backup protection mechanism by making the
corresponding procedures refresh-interval independent and hence
compatible with Refresh-interval Independent RSVP (RI-RSVP) specified
in RFC 8370. Hence, this document updates RFC 4090 in order to
support RI-RSVP capability specified in RFC 8370.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC-2119 [RFC2119].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
Ramachandran, et al. Expires May 26, 2021 [Page 1]
Internet-Draft RI-RSVP FRR Bypass November 2020
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 26, 2021.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Motivation . . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Problem Description . . . . . . . . . . . . . . . . . . . . . 5
4. Solution Aspects . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Requirement on RFC 4090 Capable Node to advertise RI-RSVP
Capability . . . . . . . . . . . . . . . . . . . . . . . 8
4.2. Signaling Handshake between PLR and MP . . . . . . . . . 9
4.2.1. PLR Behavior . . . . . . . . . . . . . . . . . . . . 9
4.2.2. Remote Signaling Adjacency . . . . . . . . . . . . . 10
4.2.3. MP Behavior . . . . . . . . . . . . . . . . . . . . . 10
4.2.4. "Remote" State on MP . . . . . . . . . . . . . . . . 11
4.3. Impact of Failures on LSP State . . . . . . . . . . . . . 12
4.3.1. Non-MP Behavior . . . . . . . . . . . . . . . . . . . 12
4.3.2. LP-MP Behavior . . . . . . . . . . . . . . . . . . . 13
4.3.3. NP-MP Behavior . . . . . . . . . . . . . . . . . . . 13
4.3.4. Behavior of a Router that is both LP-MP and NP-MP . . 14
4.4. Conditional PathTear . . . . . . . . . . . . . . . . . . 15
4.4.1. Sending Conditional PathTear . . . . . . . . . . . . 15
4.4.2. Processing Conditional PathTear . . . . . . . . . . . 15
4.4.3. CONDITIONS Object . . . . . . . . . . . . . . . . . . 16
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