RFC 9117 on Revised Validation Procedure for BGP Flow Specifications
rfc-editor@rfc-editor.org Tue, 24 August 2021 05:51 UTC
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Subject: RFC 9117 on Revised Validation Procedure for BGP Flow Specifications
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A new Request for Comments is now available in online RFC libraries. RFC 9117 Title: Revised Validation Procedure for BGP Flow Specifications Author: J. Uttaro, J. Alcaide, C. Filsfils, D. Smith, P. Mohapatra Status: Standards Track Stream: IETF Date: August 2021 Mailbox: ju1738@att.com, jalcaide@cisco.com, cf@cisco.com, djsmith@cisco.com, mpradosh@yahoo.com Pages: 12 Updates: RFC 8955 I-D Tag: draft-ietf-idr-bgp-flowspec-oid-15.txt URL: https://www.rfc-editor.org/info/rfc9117 DOI: 10.17487/RFC9117 This document describes a modification to the validation procedure defined for the dissemination of BGP Flow Specifications. The dissemination of BGP Flow Specifications as specified in RFC 8955 requires that the originator of the Flow Specification match the originator of the best-match unicast route for the destination prefix embedded in the Flow Specification. For an Internal Border Gateway Protocol (iBGP) received route, the originator is typically a border router within the same autonomous system (AS). The objective is to allow only BGP speakers within the data forwarding path to originate BGP Flow Specifications. Sometimes it is desirable to originate the BGP Flow Specification from any place within the autonomous system itself, for example, from a centralized BGP route controller. However, the validation procedure described in RFC 8955 will fail in this scenario. The modification proposed herein relaxes the validation rule to enable Flow Specifications to be originated within the same autonomous system as the BGP speaker performing the validation. Additionally, this document revises the AS_PATH validation rules so Flow Specifications received from an External Border Gateway Protocol (eBGP) peer can be validated when such a peer is a BGP route server. This document updates the validation procedure in RFC 8955. This document is a product of the Inter-Domain Routing Working Group of the IETF. This is now a Proposed Standard. STANDARDS TRACK: This document specifies an Internet Standards Track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the Official Internet Protocol Standards (https://www.rfc-editor.org/standards) for the standardization state and status of this protocol. Distribution of this memo is unlimited. This announcement is sent to the IETF-Announce and rfc-dist lists. To subscribe or unsubscribe, see https://www.ietf.org/mailman/listinfo/ietf-announce https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist For searching the RFC series, see https://www.rfc-editor.org/search For downloading RFCs, see https://www.rfc-editor.org/retrieve/bulk Requests for special distribution should be addressed to either the author of the RFC in question, or to rfc-editor@rfc-editor.org. Unless specifically noted otherwise on the RFC itself, all RFCs are for unlimited distribution. The RFC Editor Team Association Management Solutions, LLC