Subject: [Technical Errata Reported] RFC6571 (3561)

From: RFC Errata System <[email-masked]>
Date: Thu, 21 Mar 2013 00:01:22 -0700 (PDT)

The following errata report has been submitted for RFC6571,
"Loop-Free Alternate (LFA) Applicability in Service Provider (SP) Networks".

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You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=6571&eid=3561

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Type: Technical
Reported by: Ciril Rozic <[email-masked]>

Section: 3.1.1.1

Original Text
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The LFA to P is via C2, because c < d + u.  It is node-protecting if
   eq2: x + e < x + c, i.e., if e < c.

Corrected Text
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The LFA to P is via C2 if x + e < d + u + x.   It is node-protecting if
   eq2: x + e < c + x, i.e., if e < c.

Notes
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The condition for the first sentence e < d + u is not stated in the assumptions in Section 3.

The second sentence is not incorrect, but "c + x" is more consistent with eq1 in Section 2.

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RFC6571 (draft-ietf-rtgwg-lfa-applicability-06)
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Title               : Loop-Free Alternate (LFA) Applicability in Service Provider (SP) Networks
Publication Date    : June 2012
Author(s)           : C. Filsfils, Ed., P. Francois, Ed., M. Shand, B. Decraene, J. Uttaro, N. Leymann, M. Horneffer
Category            : INFORMATIONAL
Source              : Routing Area Working Group
Area                : Routing
Stream              : IETF
Verifying Party     : IESG