[Isis-wg] WG LC on MPLS doc

David Ward <dward@cisco.com> Fri, 02 May 2008 16:06 UTC

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To: isis mailing list <isis-wg@ietf.org>, Christian Hopps <chopps@rawdofmt.org>
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From: David Ward <dward@cisco.com>
Date: Fri, 2 May 2008 11:04:11 -0500
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Subject: [Isis-wg] WG LC on MPLS doc
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All -
	Many apologies for getting this draft to you late for review but, it  
is in IETF LC:

http://tools.ietf.org/html/draft-ietf-mpls-number-0-bw-te-lsps-09


They authors, MPLS WG chairs and Routing ADs would like you to give  
comments in  a 2 week WG LC. Please send all comments on this draft  
by May 16, 2008.



In particular I want to call to your attention on LSP origination  
trigger mechanisms (which are stated outside the scope of the draft).  
It appears to be unclear what happens during a link flap with an  
interesting number of tunnels traversing that link. Will it trigger  
LSP flooding to advert/update the TE-LSP-count subtlv? Will this  
scenario cause a storm? RFC 3784 states with respect to sub-TLV 11:

" For stability reasons, rapid changes in the values in this sub-TLV
    SHOULD NOT cause rapid generation of LSPs."

How should this be addressed? What should the ISIS WG state as a  
general policy for other WGs to put in their docs as we have run into  
this issue several times in the last few years?

Many thanks.

-DWard, Chopps


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