Re: [mpls] working group last call for draft-ietf-mpls-lsp-ping-reply-mode-simple-01

["Adrian Farrel" <[e-mail]>]

Hi,
 
I have read the most recent revision of this document and have no objection to
the WG requesting its publication.
 
I have some comments that I think should be addressed before publication.
 
Thanks,
Adrian
 
I don't believe this document updates 4379. It certainly does not
explain how it updates 4379, and since 7110 did not update 4379, it
seems unlikely that this document does. However, if the authors feel that
it is intended to update 4379 (i.e., an implementation of 4379 will not
be complete without also including the function of this document, for 
example, there is a problem in 4379 that this document fixes) then the
document needs to explain what the update is and how 4379 implementations
are affected.
 
I *can* believe that this document updates 7110, but it needs to explain
it and (presumably) observe that 7110 is not complete without this
document. (Actually, section 3.1 has most of this text, but the
Introduction should make the clear linkage to the "update".)
 
---
 
Section 3.2 gives clear instructions and guidance on forming the Reply
Mode Order TLV but not on what to do if a received TLV deviates from the
MUST and MUST NOT instructions. Options might include ignoring errors,
ignoring the TLV, ignoring the message. But presumably not sending an
error response (because how would you know how to send it?)
 
---
                                                     
The last guidance in 3.2 is:
 
   8.  Reply Mode value 1 (Do not reply) SHOULD NOT be used in the Reply
       Mode Order TLV.
 
"SHOULD NOT" means "you can do it if you have good reason." Please can
you explain the good reason and how the receiver should interpret a 
"Do not reply" mode coming, say, third in a list of five modes.
 
---
 
The security considerations are hard to believe!
At the very least, 7110 makes some security observations that surely
apply here.
 
From: mpls [mailto:[e-mail]] On Behalf Of Ross Callon
Sent: 20 March 2015 14:04
To: [e-mail]
Cc: Loa Andersson; [e-mail]
Subject: [mpls] working group last call for
draft-ietf-mpls-lsp-ping-reply-mode-simple-01
 
Working Group,
 
This is to initiate a working group last call on
draft-ietf-mpls-lsp-ping-reply-mode-simple-01.
Because this WGLC will span the IETF in Dallas, it will be extended to three
weeks. 
 
Please send your comments to the mpls wg mailing list ([e-mail]).
 
There are no IPR disclosures against this document. All the authors have stated
that they 
are not aware of any IPR that relates to this draft.
 
This working group last call ends Friday  April 10, 2015.  
 
Ross
for the MPLS WG chairs