[Technical Errata Reported] RFC5884 (5085)

RFC Errata System <rfc-editor@rfc-editor.org> Fri, 11 August 2017 05:36 UTC

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Subject: [Technical Errata Reported] RFC5884 (5085)
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The following errata report has been submitted for RFC5884,
"Bidirectional Forwarding Detection (BFD) for MPLS Label Switched Paths (LSPs)".

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You may review the report below and at:
http://www.rfc-editor.org/errata/eid5085

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Type: Technical
Reported by: Balaji Rajagopalan <balajir@juniper.net>;

Section: 6

Original Text
-------------
The egress LSR MAY respond with an LSP Ping Echo
reply message that carries the local discriminator assigned by it for
the BFD session.

Corrected Text
--------------
The egress LSR MUST respond with an LSP Ping Echo reply message that
MAY carry the local discriminator assigned by it for the BFD session.


Notes
-----
It is not clear from the original text which of the following is optional:
  -  The egress MUST send a reply, but the discriminator in the reply is optional
  -  The reply itself is optional
 
Technically, the reply cannot be optional, because the egress needs to report LSP-Ping verification status to the ingress.

The proposed text recommends to include BFD discriminator in the reply. This was the intent of the original text.

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RFC5884 (draft-ietf-bfd-mpls-07)
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Title               : Bidirectional Forwarding Detection (BFD) for MPLS Label Switched Paths (LSPs)
Publication Date    : June 2010
Author(s)           : R. Aggarwal, K. Kompella, T. Nadeau, G. Swallow
Category            : PROPOSED STANDARD
Source              : Bidirectional Forwarding Detection
Area                : Routing
Stream              : IETF
Verifying Party     : IESG