[Idr] Re: [Core] draft-haas-idr-bgp-attribute-escape-04 - WG Adoption call (6/2 to 6/16/2026).

[Lancheng <[e-mail]>]

Dear all,




I support adoption of this document.

>3) Jeff Haas feels this will help writers of new drafts correctly use these optional transitive attributes.

I agree. This document captures an important operational lesson from BGP extension design and provides useful guidance for future work.




Best,

Lancheng







-----Original Messages-----
From:"Susan Hares" <[e-mail]>
Send time:Wednesday, 03/06/2026 07:19:21
To: "idr@ietf. org" <[e-mail]>
Subject: [Idr] [Core] draft-haas-idr-bgp-attribute-escape-04 - WG Adoption call (6/2 to 6/16/2026).



This begins a 2-week WG adoption call for draft-haas-idr-bgp-attribute-escape-04.txt (6/2/2026 to 6/16/2026).

 

The author should respond to this email with an IPR statement.  

 

WG Members - please comment on this adoption, and in your comments mention “support or no support.

 

A few things from the abstract may be helpful in your reading of this draft:

 

1) This is an informational draft.

2) The focus is “optional transitive attributes” for BGP that “escape” inadvertently beyond intended scope

3) Jeff Haas feels this will help writers of new drafts correctly use these optional transitive attributes.

 

Cheerily, Sue Hares

(Shepherd)

 

-----------

 

Excerpts from Abstract text:

 

   A significant part of the success of [RFC4271] BGP is

   due to its ability to incrementally add new features to its Path

   Attributes when they are marked "optional transitive".

   Implementations that are ignorant of a feature for an unknown Path

   Attribute that are so marked will propagate BGP routes with such

   attributes.

 

   Unfortunately, this blind propagation of unknown Path Attributes may

   happen for features that are intended to be used in a limited scope.

   When such Path Attributes inadvertently are carried beyond that

   scope, it can lead to things such as unintended disclosure of

   sensitive information, or cause improper routing.  In their worst

   cases, such propagation may be for malformed Path Attributes and lead

   to BGP session resets or crashes.

 

   This document calls such inadvertent propagation of BGP Path

   Attributes, "attribute escape".  This document further describes some

   of the scenarios that leads to this behavior and makes

   recommendations on practices that may limit its impact.