Re: [Detnet-dp-dt] Using MS-PW concept for the d-pw

Hi,

> On 24 Feb 2017, at 23:18, Jiangyuanlong <jiangyuanlong@huawei.com> wrote:
> 
> I agreed to alternative 2. L-label is not needed, S-PE must look into the PW label (further, extract sequence number in the CW) of a packet, and all FRER semantics can be coupled with the PW label.

Ok. Just note that alternative 1 also looks into d-pw label etc. There is no difference regarding FRER logic in that sense. The T-PE or S-PE just has to pop L-Label _within_ the node before it looks into d-pw.

- Jouni

> 
> -----Original Message-----
> From: Jouni Korhonen [mailto:jouni.korhonen@broadcom.com] 
> Sent: Saturday, February 25, 2017 3:07 PM
> To: Jiangyuanlong
> Cc: detnet-dp-dt@ietf.org; Loa Andersson
> Subject: Re: [Detnet-dp-dt] Using MS-PW concept for the d-pw
> 
> Hi,
> 
>> [YJ] I regard the L-Labels and T-labels are the same LSP layer. If we look into the full MPLS label stack of a packet in a PW, normally there is an LSP label at the top (unless PHP is enabled for the last hop). 
>> Not sure what is the L-Label in your picture, is it different from LSP label? 
> 
> L-labels have been so far in the discussion between MS-PW PEs. T-labels are between any LSR. L-labels are not PHPed i.e., even if PHP is enable the L-Label stays and the label above it gets popped (that we have been referring as T-Labels). T- and L-labels are just a naming convention. IF you don’t have “between MS-PW PEs” semantic associated with the L-Label, it is the same as T-Label ;)
> 
> 
> 
> case L-labels are present.. (alternative 1)
> 
>                     PHP
>                   -------->
> +------------+                  +------------+
> |  T-labels  |                  |  L-label   |
> +------------+                  +------------+
> |  L-label   |                  | d-pw label |
> +------------+                  +------------+
> | d-pw label |                  |            |
> +------------+                  |  Payload   |
> |            |                  |            |
> |  Payload   |                  +------------+
> |            |
> +------------+
> 
> case no L-labels.. (alternative 2.. and also alternative 3 if you think T- and L-labels are the same)
> 
>                     PHP
>                   -------->
> +------------+                  +------------+
> |  T-labels  |                  | d-pw label |
> +------------+                  +------------+
> | d-pw label |                  |            |
> +------------+                  |  Payload   |
> |            |                  |            |
> |  Payload   |                  +------------+
> |            |
> +------------+
> 
> 
> 
> 
> 
> - Jouni
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