Segment Routing Generic TLV for MPLS Label Switched Path (LSP) Ping/ Traceroute
draft-nainar-mpls-spring-lsp-ping-sr-generic-sid-04
Network Work group N. Nainar, Ed.
Internet-Draft C. Pignataro, Ed.
Intended status: Standards Track Z. Ali
Expires: April 30, 2021 C. Filsfils
Cisco
T. Saad
Juniper
October 27, 2020
Segment Routing Generic TLV for MPLS Label Switched Path (LSP) Ping/
Traceroute
draft-nainar-mpls-spring-lsp-ping-sr-generic-sid-04
Abstract
RFC8402 introduces Segment Routing architecture that leverages source
routing and tunneling paradigms and can be directly applied to the
Multi Protocol Label Switching (MPLS) data plane. A node steers a
packet through a controlled set of instructions called segments, by
prepending the packet with Segment Routing header. SR architecture
defines different types of segments with different forwarding
semantics associated. SR can be applied to the MPLS directly and to
IPv6 dataplane using a new routing header.
RFC8287 defines the extensions to MPLS LSP Ping and Traceroute for
Segment Routing IGP-Prefix and IGP-Adjacency Segment Identifier
(SIDs) with an MPLS data plane. Various SIDs are proposed as part of
SR architecture with different associated instructions that raises a
need to come up with new Target FEC Stack Sub-TLV for each such SIDs.
This document defines a new Target FEC Stack Sub-TLV that is used to
validate the instruction associated with any SID.
Status of This Memo
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material or to cite them other than as "work in progress."
Nainar, et al. Expires April 30, 2021 [Page 1]
Internet-Draft SR Generic TLV for MPLS LSP Ping/Trace October 2020
This Internet-Draft will expire on April 30, 2021.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Challenges with Existing Mechanism . . . . . . . . . . . 3
2. Requirements notation . . . . . . . . . . . . . . . . . . . . 3
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Target FEC Stack sub-TLV for Segment Routing SID . . . . . . 4
4.1. Segment Routing Generic Label . . . . . . . . . . . . . . 4
4.2. FEC for Path validation . . . . . . . . . . . . . . . . . 4
5. Procedures . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.1. SID to Interface Mapping . . . . . . . . . . . . . . . . 5
5.2. Initiator behavior . . . . . . . . . . . . . . . . . . . 6
5.2.1. SRGL in Target FEC Stack TLV . . . . . . . . . . . . 6
5.3. Responder behavior . . . . . . . . . . . . . . . . . . . 7
5.4. PHP flag behavior . . . . . . . . . . . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
6.1. New Target FEC Stack Sub-TLVs . . . . . . . . . . . . . . 8
6.2. Security Considerations . . . . . . . . . . . . . . . . . 8
7. Acknowledgement . . . . . . . . . . . . . . . . . . . . . . . 8
8. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 8
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
9.1. Normative References . . . . . . . . . . . . . . . . . . 8
9.2. Informative References . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
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