draft-ietf-mpls-rfc8287-len-clarification-00.txt   draft-ietf-mpls-rfc8287-len-clarification-01.txt 
Network Work group N. Nainar Network Work group N. Nainar
Internet-Draft C. Pignataro Internet-Draft C. Pignataro
Updates: 8287 (if approved) Cisco Systems, Inc. Updates: 8287 (if approved) Cisco Systems, Inc.
Intended status: Standards Track F. Iqbal Intended status: Standards Track F. Iqbal
Expires: September 26, 2019 Individual Expires: November 26, 2019 Individual
A. Vainshtein A. Vainshtein
ECI Telecom ECI Telecom
March 25, 2019 May 25, 2019
RFC8287 Sub-TLV Length Clarification RFC8287 Sub-TLV Length Clarification
draft-ietf-mpls-rfc8287-len-clarification-00 draft-ietf-mpls-rfc8287-len-clarification-01
Abstract Abstract
RFC8287 defines the extensions to MPLS LSP Ping and Traceroute for RFC8287 defines the extensions to MPLS LSP Ping and Traceroute for
Segment Routing IGP-Prefix and IGP-Adjacency Segment Identifier Segment Routing IGP-Prefix and IGP-Adjacency Segment Identifier
(SIDs) with an MPLS data plane. RFC8287 proposes 3 Target FEC Stack (SIDs) with an MPLS data plane. RFC8287 proposes 3 Target FEC Stack
Sub-TLVs. While the standard defines the format and procedure to Sub-TLVs. While the standard defines the format and procedure to
handle those Sub-TLVs, it does not sufficiently clarify how the handle those Sub-TLVs, it does not sufficiently clarify how the
length of the Segment ID Sub-TLVs should be computed to include in length of the Segment ID Sub-TLVs should be computed to include in
the Length field of the Sub-TLVs which may result in interoperability the Length field of the Sub-TLVs which may result in interoperability
skipping to change at page 1, line 44 skipping to change at page 1, line 44
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 26, 2019. This Internet-Draft will expire on November 26, 2019.
Copyright Notice Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119] [RFC8174]. document are to be interpreted as described in [RFC2119] [RFC8174].
4. Length field clarification for Segment ID Sub-TLVs 4. Length field clarification for Segment ID Sub-TLVs
Section 5 of [RFC8287] defines 3 different Segment ID Sub-TLVs that Section 5 of [RFC8287] defines 3 different Segment ID Sub-TLVs that
will be included in Target FEC Stack TLV defined in [RFC8029]. The will be included in Target FEC Stack TLV defined in [RFC8029]. The
length of each Sub-TLVs MUST be calculated as defined in this length of each Sub-TLVs MUST be calculated as defined in this
section. section.
The figures in section 5.1, 5.2 and 5.3 of [RFC8287] are replaced by
the below figures in section 4.1, 4.2 and 4.3 respectively. The
updated figures contain explicitly defined length.
4.1. IPv4 IGP-Prefix Segment ID Sub-TLV 4.1. IPv4 IGP-Prefix Segment ID Sub-TLV
The Sub-TLV length for IPv4 IGP-Prefix Segment ID MUST be set to 8 as The Sub-TLV length for IPv4 IGP-Prefix Segment ID MUST be set to 8 as
shown in the below TLV format: shown in the below TLV format:
0 1 2 3 0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Type = 34 (IPv4 IGP-Prefix SID)| Length = 8 | |Type = 34 (IPv4 IGP-Prefix SID)| Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
skipping to change at page 5, line 39 skipping to change at page 5, line 39
7. Contributors 7. Contributors
The below individuals contributed to this document: The below individuals contributed to this document:
Zafar Ali, Cisco Systems, Inc. Zafar Ali, Cisco Systems, Inc.
8. Acknowledgement 8. Acknowledgement
The authors would like to thank Michael Gorokhovsky and Manohar The authors would like to thank Michael Gorokhovsky and Manohar
Doppalapudi for investigating the interop issue during EANTC test Doppalapudi for investigating the interop issue during EANTC test.
9. Normative References 9. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>. <https://www.rfc-editor.org/info/rfc2119>.
[RFC8029] Kompella, K., Swallow, G., Pignataro, C., Ed., Kumar, N., [RFC8029] Kompella, K., Swallow, G., Pignataro, C., Ed., Kumar, N.,
Aldrin, S., and M. Chen, "Detecting Multiprotocol Label Aldrin, S., and M. Chen, "Detecting Multiprotocol Label
 End of changes. 6 change blocks. 
5 lines changed or deleted 9 lines changed or added

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