Network Working Group P. Francois Internet-Draft M. Younsi Intended status: Standards Track INSA-Lyon Expires: 14 September 2023 P. Lucente NTT 13 March 2023 BMP Loc-RIB: Peer address draft-francois-grow-bmp-loc-peer-00 Abstract BMP Loc-RIB lets a BMP publisher set the Peer Address value of a path information to zero. This document introduces the option to communicate the actual peer from which a path was received when advertising that path with BMP Loc-RIB. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 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 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 14 September 2023. Copyright Notice Copyright (c) 2023 IETF Trust and the persons identified as the document authors. All rights reserved. Francois, et al. Expires 14 September 2023 [Page 1] Internet-Draft bmp-loc-peer March 2023 This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. BMPv3 Behavior . . . . . . . . . . . . . . . . . . . . . . . 2 3. BMPv4 TLV Based Behavior . . . . . . . . . . . . . . . . . . 3 4. Security Considerations . . . . . . . . . . . . . . . . . . . 3 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 3 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 3 6.1. Normative References . . . . . . . . . . . . . . . . . . 3 6.2. Informative References . . . . . . . . . . . . . . . . . 3 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4 1. Introduction Using BMP Loc-RIB [RFC9069], the Peer Address field of a Per-Peer header is Zero-filled. This prevents a collector from knowing from which peer a path selected as best was received. The nexthop attribute of a path is indeed not an identifier of the peer from which the path was received. This document introduces the option to actually set this field to the IP Address of the peer from which the installed path was received. For BMPv4, it introduces a TLV describing the Peer Address. 2. BMPv3 Behavior A BMPv3 Loc-RIB enabled node following this specification sets the Peer Address field in the Per-Peer header to the address of the Peer from which this path was received. The V flag is applicable, so that if the peer address is an IPv6 address, the V flag MUST be set to 1. If the peer address is an IPv4 address, the V flag MUST be set to 0. This behavior SHOULD be disabled by default and enabled through configuration, so that a defensive BMP receiver would not terminate a BMP session over which it receives a BMP Loc-RIB messages with a non- zero Peer Address field. This behavior can be enabled when the operator knows that the receiver can receive BMP Loc-RIB messages following this specification. Francois, et al. Expires 14 September 2023 [Page 2] Internet-Draft bmp-loc-peer March 2023 3. BMPv4 TLV Based Behavior In BMP v4 [I-D.ietf-grow-bmp-tlv], TLV's can be used to provide optional information along with monitored paths. Peer Address information can be included using one such TLV. A TLV type "Peer-Address TLV" needs to be reserved from the BMP Route Monitoring TLVs registry. The length field is 4 when the peer is IPv4 and 16 when the peer is IPv6, as the index field of the TLV is not included in the length field. The value is the IP address the peer from which the monitored path was received. 4. Security Considerations This document does not introduce new security considerations. 5. Acknowledgements These are the acks. 6. References 6.1. Normative References [I-D.ietf-grow-bmp-tlv] Lucente, P. and Y. Gu, "TLV support for BMP Route Monitoring and Peer Down Messages", Work in Progress, Internet-Draft, draft-ietf-grow-bmp-tlv-10, 8 November 2022, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC9069] Evens, T., Bayraktar, S., Bhardwaj, M., and P. Lucente, "Support for Local RIB in the BGP Monitoring Protocol (BMP)", RFC 9069, DOI 10.17487/RFC9069, February 2022, . 6.2. Informative References Francois, et al. Expires 14 September 2023 [Page 3] Internet-Draft bmp-loc-peer March 2023 Authors' Addresses Pierre Francois INSA-Lyon Villeurbanne France Email: pierre.francois@insa-lyon.fr Maxence Younsi INSA-Lyon Villeurbanne France Email: maxence.younsi@insa-lyon.fr Paolo Lucente NTT Siriusdreef 70-72 Hoofddorp, WT 2132 Netherlands Email: paolo@ntt.net Francois, et al. Expires 14 September 2023 [Page 4]