Re: [Isis-wg] draft-decraene-isis-lsp-lifetime-problem-statement-00.txt

prz@net4u.ch Mon, 06 July 2015 20:48 UTC

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Cc: SCHMITZ Christof IMT/OLN <christof.schmitz@orange.com>
Subject: Re: [Isis-wg] draft-decraene-isis-lsp-lifetime-problem-statement-00.txt
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It has been omitted on purpose of course originally ;-) 
format-wise one can  simply reuse something
like  https://tools.ietf.org/html/rfc3358

as optional TLV.
The problem is more that it needs to be recomputed when lifetime is
changed (will slow down flooding albeit an incremental computation is
possible if e.g. the algorithm is simple XOR, just XOR current back
and XOR new one on) and it will be hard to deploy incrementally with
that (albeit I can see a simple trick where the last-computing
router-ID is put into the CSUM so if it's off, it means the CSUM is
useless). 
makes sense ? 
--- tony 

----- Ursprüngliche Nachricht -----
Von: bruno.decraene@orange.com
An:"isis-wg@ietf.org list" 
Cc:"SCHMITZ Christof IMT/OLN" 
Gesendet:Mon, 6 Jul 2015 19:37:44 +0000
Betreff:[Isis-wg]
draft-decraene-isis-lsp-lifetime-problem-statement-00.txt

 Hi all,

 Please find below a draft describing the problem statement with
regards to the possible corruption of the LSP lifetime.
 https://tools.ietf.org/html/draft-decraene-isis-lsp-lifetime-problem-statement-00

 Comments welcomed.

 Thanks,
 Regards,
 Bruno, Christof

 -----Original Message-----
 From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org] 
 Sent: Monday, July 06, 2015 9:29 PM

 A new version of I-D,
draft-decraene-isis-lsp-lifetime-problem-statement-00.txt
 has been successfully submitted by Bruno Decraene and posted to the
IETF repository.

 Name: draft-decraene-isis-lsp-lifetime-problem-statement
 Revision: 00
 Title: IS-IS LSP lifetime corruption - Problem Statement
 Document date: 2015-07-06
 Group: Individual Submission
 Pages: 6
 URL:
https://www.ietf.org/internet-drafts/draft-decraene-isis-lsp-lifetime-problem-statement-00.txt
 Status:
https://datatracker.ietf.org/doc/draft-decraene-isis-lsp-lifetime-problem-statement/
 Htmlized:
https://tools.ietf.org/html/draft-decraene-isis-lsp-lifetime-problem-statement-00

 Abstract:
 The IS-IS protocol exchanges Link State Packet (LSP) to exchange
 routing information. The lifetime of this LSP is located in the LSP
 header and is neither protected from corruption by the Fletcher
 checksum nor by cryptographic authentication. So the LSP lifetime
 may be altered, either accidentally or maliciously any time.

 The lifetime field of the LSP is an important field for the correct
 operation of IS-IS. Corruption of this LSP lifetime may cause
 flooding storm with severe impact in the network.

 This draft documents the problem statement and calls for a solution.

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