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

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,  <lizhong.jin@zte.com.cn> 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, and wait 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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