[rfc-dist] RFC 9234 on Route Leak Prevention and Detection Using Roles in UPDATE and OPEN Messages

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        RFC 9234

        Title:      Route Leak Prevention and Detection 
                    Using Roles in UPDATE and OPEN Messages 
        Author:     A. Azimov,
                    E. Bogomazov,
                    R. Bush,
                    K. Patel,
                    K. Sriram
        Status:     Standards Track
        Stream:     IETF
        Date:       May 2022
        Mailbox:    [e-mail],
                    [e-mail],
                    [e-mail],
                    [e-mail],
                    [e-mail]
        Pages:      12
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-idr-bgp-open-policy-24.txt

        URL:        https://www.rfc-editor.org/info/rfc9234

        DOI:        10.17487/RFC9234

Route leaks are the propagation of BGP prefixes that violate
assumptions of BGP topology relationships, e.g., announcing a route
learned from one transit provider to another transit provider or a
lateral (i.e., non-transit) peer or announcing a route learned from
one lateral peer to another lateral peer or a transit provider. These
are usually the result of misconfigured or absent BGP route filtering
or lack of coordination between autonomous systems (ASes). Existing
approaches to leak prevention rely on marking routes by operator
configuration, with no check that the configuration corresponds to
that of the External BGP (eBGP) neighbor, or enforcement of the two
eBGP speakers agreeing on the peering relationship. This document
enhances the BGP OPEN message to establish an agreement of the
peering relationship on each eBGP session between autonomous systems
in order to enforce appropriate configuration on both sides.
Propagated routes are then marked according to the agreed
relationship, allowing both prevention and detection of route leaks.

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 
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