Re: [bess] [Technical Errata Reported] RFC8365 (7735)

[John Scudder <[e-mail]>]

Hi All,

I started to look at this and pretty quickly got lost in a maze of twisty passages. RFC 8365 doesn’t mention the "ESI Label" Extended Community at all, I suppose it gets dragged in through the reliance on RFC 7432 as an underlying mechanism. Since the erratum proposes a new requirement ("The "ESI Label" field, in the "ESI Label" Extended Community, is set to all zeros in case of VxLAN encapsulation”) I think the most it can be verified as is Hold For Document update. Soliciting feedback.

—John

> On Dec 19, 2023, at 4:32 AM, RFC Errata System <[e-mail]> wrote:
> 
> The following errata report has been submitted for RFC8365,
> "A Network Virtualization Overlay Solution Using Ethernet VPN (EVPN)".
> 
> --------------------------------------
> You may review the report below and at:
> https://urldefense.com/v3/__https://www.rfc-editor.org/errata/eid7735__;!!NEt6yMaO-gk!DJ230uma4G4hxiFjp6qUOeiX8H6oLKgKOaS-1Tm7La77-DewSFRo0SzansDz_hUnOG9xGOaicVISO8JHw_lvGQ$
> 
> --------------------------------------
> Type: Technical
> Reported by: Gaurav Sinha <[e-mail]>
> 
> Section: 8.3.1
> 
> Original Text
> -------------
> Since VXLAN and NVGRE encapsulations do not include the ESI label, other means of performing the split-horizon filtering function must be devised for these encapsulations.
> 
> Corrected Text
> --------------
> The "ESI Label" field, in the "ESI Label" Extended Community, is set to all zeros in case of VxLAN encapsulation.
> Since even though the VXLAN and NVGRE encapsulations send the "ESI Label" Extended Community, yet they do not set the "ESI label" field in it. Therefore, other means of performing the split-horizon filtering function must be devised for these encapsulations.
> 
> Notes
> -----
> It should be mentioned somewhere in this RFC document that the "ESI Label" Extended Community is sent with VxLAN encapsulation too, just like it is used with MPLS, but with the "MPLS Label" field set to all zeros in case of VxLAN.
> 
> Otherwise, it gives rise to the unanswered question in mind, about the value of that field, given that there are no labels in VxLAN.
> 
> Instructions:
> -------------
> This erratum is currently posted as "Reported". (If it is spam, it
> will be removed shortly by the RFC Production Center.) Please
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> 
> --------------------------------------
> RFC8365 (draft-ietf-bess-evpn-overlay-12)
> --------------------------------------
> Title               : A Network Virtualization Overlay Solution Using Ethernet VPN (EVPN)
> Publication Date    : March 2018
> Author(s)           : A. Sajassi, Ed., J. Drake, Ed., N. Bitar, R. Shekhar, J. Uttaro, W. Henderickx
> Category            : PROPOSED STANDARD
> Source              : BGP Enabled ServiceS
> Area                : Routing
> Stream              : IETF
> Verifying Party     : IESG