Re: [PWE3] WG Poll on draft-jin-pwe3-cbit-negotiation-03.txt ( comment )

[[e-mail]]

Andy,
Thanks for the suggestion, and will do the presentation at MPLS.

Lizhong
 

"Malis, Andrew G. (Andy)" <[e-mail]> wrote on 2011-03-17 
19:33:08:

> Lizhong,
> 
> Thanks. Since this affects LDP, you should ask for time on the MPLS 
> WG’s agenda to present it there in addition to presenting it in PWE3.
> 
> Cheers,
> Andy
> 
> On 3/16/11 23:07 , "[e-mail]" <[e-mail]> 
wrote:

> 
> Hi Andy, 
> Thank you very much. We have uploaded the 04 version. Please get it 
> from the following link: 
> http://tools.ietf.org/html/draft-jin-pwe3-cbit-negotiation-04.txt 
> 
> Regards 
> Lizhong 
> 
> 
> [e-mail] wrote on 2011-03-07 23:52:22:
> 
> > Lizhong,
> > 
> > There's been a lot of support for WG adoption of this draft. Please
> > update the draft to -04 to reflect the discussion on the list (before
> > the window closes in a week) and we'll announce the adoption in
> > Prague, followed by having you issue the WG version of the draft.
> > 
> > Thanks,
> > Andy
> > 
> > On Thu, Mar 3, 2011 at 10:41 AM,  <[e-mail]> wrote:
> > >
> > > Luca,
> > > After discussing with the authors, we decide to add the wait for 
label
> > > release before sending label request, this wouldn't harm and bring 
some
> > > secure.
> > >
> > > Then are you OK with the following text?
> > >
> > > When Local PE changes its control word from NOT PREFERRED to 
PREFERRED and
> > > only if it already received the remote label mapping message with 
C-bit=0,
> > > additional procedure will be added as follow:
> > > -i Local PE MUST send a label withdraw message to remote PE if it 
has
> > > previously sent a label mapping, and wait until receiving a label 
release
> > > from the remote PE.
> > > -ii Local PE MUST send a label request message to remote PE, andwait 
until
> > > receiving a label mapping message containing the remote PE 
configured
> > > control word setting.
> > > -iii After receiving remote PE label mapping with control word 
setting,
> > > Local PE MUST follow procedures defined in [RFC4447] section 6 
> when sending
> > > it's label mapping message.
> > >
> > > Correspondingly, the modified procedure of PE in figure 1 will be as
> > > follows:
> > >
> > > 1. PE2 changes locally configured control word to PREFERRED.
> > > 2. PE2 will then send label withdraw message to PE1.
> > > 3. PE1 MUST send label release in reply to label withdraw 
> message from PE2.
> > > 4. Upon receipt of Label release message from PE1, PE2 MUST send 
label
> > > request messages to PE1 although it already received the label 
> mapping with
> > > C-bit=0.
> > > 5. PE1 MUST send label mapping message with C-bit=1 again to 
PE2(Note: PE1
> > > MUST send label mapping with locally configured CW parameter).
> > > 6. PE2 receives the label mapping from PE1 and updates the remote 
label
> > > binding information. PE2 MUST wait for PE1 label binding before 
> sending its
> > > label binding with C-bit set, only if it previously had a label 
> binding with
> > > C-bit = 0 from PE1.
> > > 7. PE2 will send label mapping to PE1 with C-bit=1.
> > >
> > > It is to be noted that the above assume that PE1 is configured to 
support
> > > CW, however in step 5 if PE1 doesn't support CW, PE1 would send the 
label
> > > mapping message with C-bit =0, this would result in PE2 in step 
> 7 sending a
> > > label mapping with C-bit=0 as per [RFC4447] CW negotiation 
procedure.
> > >
> > > Thanks
> > > Lizhong
> > >
> > >
> > > ------------send by Luca 
> Martini-------------------------------------------
> > > Matthew & Andy,
> > >
> > >
> > > Although I support clarifying this procedure , I believe this 
document
> > > needs some work.
> > > In section 3 for example :
> > >
> > >    When Local PE changes its control word from NOT PREFERRED to
> > >    PREFERRED and only if it already received the remote label 
mapping
> > >    message with C-bit=0, additional procedure will be added as 
follow:
> > >
> > >          -i. Local PE sends label withdraw message to the remote if 
it
> > >              already sends label mapping message, for it has changed 
its
> > >              control word parameter.
> > >
> > >         -ii. Local PE MUST send a label request messages to peer PE 
to
> > >              get peer's configured control word parameter before 
sending
> > >              new label mapping message to peer PE.
> > >
> > >        -iii. After receiving the new label mapping message from peer 
PE
> > >              and updating the remote label binding information, the
> > >              Local PE should send label mapping to peer PE according 
to
> > >              procedures defined in [RFC4447].
> > >
> > > What does the item i) mean ? the English is not clear.
> > > Why does the PE have to do ii) ?
> > >
> > > All we really need is a statement on how the c-bit negotiation state
> > > machine can be reset if one end has changed "his mind" .
> > >
> > > Can we fix this document before  issuing the -00 WG draft version ?
> > >
> > > Thanks.
> > > Luca
> > >
> 


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