Internet DRAFT - draft-francois-grow-bmp-loc-peer
draft-francois-grow-bmp-loc-peer
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.
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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
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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.
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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, <https://datatracker.ietf.org/doc/html/draft-ietf-
grow-bmp-tlv-10>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[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,
<https://www.rfc-editor.org/info/rfc9069>.
6.2. Informative References
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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
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