LDP Extensions for RMR
draft-ietf-mpls-ldp-rmr-extensions-01
INTERNET-DRAFT Santosh Esale
Intended Status: Proposed Standard Kireeti Kompella
Expires: May 8, 2019 Juniper Networks
November 4, 2018
LDP Extensions for RMR
draft-ietf-mpls-ldp-rmr-extensions-01
Abstract
This document describes LDP extensions to signal Resilient MPLS Ring
(RMR) Label Switched Paths (LSPs). An RMR LSP is a multipoint to
point LSP signaled using LDP (Label Distribution Protocol). RMR
Architecture document - draft-ietf-mpls-rmr-02 - describes why and
how MPLS should be used in ring topologies.
Status of this Memo
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This document is subject to BCP 78 and the IETF Trust's Legal
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Esale, et al. Expires May 8, 2019 [Page 1]
INTERNET DRAFT LDP Extensions for RMR November 4, 2018
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Table of Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Protocol extensions . . . . . . . . . . . . . . . . . . . . . 4
3.1. Ring LSP Capability . . . . . . . . . . . . . . . . . . . 4
3.2. Ring FEC Element . . . . . . . . . . . . . . . . . . . . . 4
4. Ring Procedures . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Upstream LSR . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Ring Label Mapping Procedures . . . . . . . . . . . . . . . 7
4.2.1 Definitions . . . . . . . . . . . . . . . . . . . . . . 7
4.2.2 Preliminary . . . . . . . . . . . . . . . . . . . . . . 7
4.2.3 Egress LSR . . . . . . . . . . . . . . . . . . . . . . 7
4.2.4 Ingress and Transit LSR . . . . . . . . . . . . . . . . 8
4.3 Equal Cost Multipath (ECMP) . . . . . . . . . . . . . . . . 8
4.4 Protection . . . . . . . . . . . . . . . . . . . . . . . . . 8
5. LSP Hierarchy . . . . . . . . . . . . . . . . . . . . . . . . 9
6. Ring LSPs . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 11
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 11
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 11
10. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 11
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
11.1 Normative References . . . . . . . . . . . . . . . . . . . 12
11.2 Informative References . . . . . . . . . . . . . . . . . . 12
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13
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INTERNET DRAFT LDP Extensions for RMR November 4, 2018
1 Introduction
This document describes LDP extensions to signal resilient MPLS ring
(RMR) label switched paths (LSPs). An RMR LSP is a multipoint to
point LSP signaled using LDP (Label Distribution Protocol).
Architecture document of RMR - draft-ietf-mpls-rmr-02 - describes why
and how MPLS should be used in ring topologies.
The ring is either auto-discovered or configured using IGP protocol
such as OSPF or ISIS. IGP extensions for RMR is described in a
companion documents. After the ring discovery, each ring node acting
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