Subject: [mpls] [Technical Errata Reported] RFC4379 (3399)

From: RFC Errata System <[email-masked]>
Date: Tue, 6 Nov 2012 17:39:51 -0800 (PST)

The following errata report has been submitted for RFC4379,
"Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures".

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You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=4379&eid=3399

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Type: Technical
Reported by: Fang Lu <[email-masked]>

Section: 3.3.1

Original Text
-------------
Those same addresses embedded in IPv6 would be encoded as follows:
0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 1 1 1 1 1 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Corrected Text
--------------
Those same addresses embedded in IPv6 would be encoded as follows:
0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|0 1 1 1 1 1 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 0 0|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Notes
-----
The base IPv6 address should have 16 bytes (128 bits), there are more 4 bytes typed.

Instructions:
-------------
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RFC4379 (draft-ietf-mpls-lsp-ping-13)
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Title               : Detecting Multi-Protocol Label Switched (MPLS) Data Plane Failures
Publication Date    : February 2006
Author(s)           : K. Kompella, G. Swallow
Category            : PROPOSED STANDARD
Source              : Multiprotocol Label Switching
Area                : Routing
Stream              : IETF
Verifying Party     : IESG

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From: t.petch <[email-masked]>
Date: Fri, 9 Nov 2012 14:46:45 +0000

I agree.

I have sometimes thought that this was a not too clear description of an
idea that was perhaps too clever:-(

The text in question does not mention the maximum length of the IPv6
prefix - presumably /123 - the actual length of the IPv4 prefix in the
example - presumably /27 - or the actual length of the IPv6 prefix in
the example - presumably /123 - so to gain an extra 32 zero bits seems
........ well, not too surprising:-)

Tom Petch

----- Original Message -----
From: "RFC Errata System" <[email-masked]>
To: <[email-masked]>; <[email-masked]>; <[email-masked]>;
<[email-masked]>; <[email-masked]>; <[email-masked]>;
<[email-masked]>
Cc: <[email-masked]>; <[email-masked]>; <[email-masked]>
Sent: Wednesday, November 07, 2012 1:39 AM

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> https://www.ietf.org/mailman/listinfo/mpls
>

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From: t.petch <[email-masked]>
Date: Fri, 9 Nov 2012 16:48:42 +0000

P.S. Got a bounce message for this from

 ----- Transcript of session follows -----
... while talking to magenta.juniper.net.:
>>> RCPT To:<[email-masked]>
<<< 550 5.1.1 <[email-masked]>... User unknown
550 5.1.1 <[email-masked]>... User unknown

Tom Petch