Re: [Detnet-dp-dt] [EXT] Re: Data Plane Approach - Synchronization Traffic

[Norman Finn <[e-mail]>]

> On Jan 31, 2017, at 12:25, Jouni Korhonen <[e-mail]> wrote:
> 
> Indeed. Not all traffic will receive the replication/elimination service. That is based on the configuration.
> 
> - Jouni
> 
> 
> --
> Jouni Korhonen, Broadcom Ltd.
> M: [phone]
> 
>> On Jan 31, 2017, at 12:13 PM, Balázs Varga A <[e-mail]> wrote:
>> 
>> Hi,
>> For sync usually we need hop-by-hop forwarding. 
>> So it is not clear why to consider replication (and elimination) at all?
>> Cheers
>> Bala'zs
>> 
>> -----Original Message-----
>> From: Detnet-dp-dt [mailto:[e-mail]] On Behalf Of Tal Mizrahi
>> Sent: Friday, January 27, 2017 8:37 AM
>> To: Jouni Korhonen <[e-mail]>
>> Cc: [e-mail]; Loa Andersson <[e-mail]>
>> Subject: Re: [Detnet-dp-dt] [EXT] Re: Data Plane Approach - Synchronization Traffic
>> 
>>> In a path redundancy case would the PTP messages on multiple paths be 
>>> exact copies a single origin PTP message or different PTP messages?
>> 
>> They would be two different PTP messages.
>> This implies that we would not like PTP packets to be subject to replication and elimination.
>> 
>> Tal.
>> 
>> 
>>> -----Original Message-----
>>> From: Jouni Korhonen [mailto:[e-mail]]
>>> Sent: Thursday, January 26, 2017 8:40 PM
>>> To: Tal Mizrahi
>>> Cc: Loa Andersson; [e-mail]
>>> Subject: Re: [Detnet-dp-dt] [EXT] Re: Data Plane Approach - 
>>> Synchronization Traffic
>>> 
>>> 
>>> 
>>>> On Jan 25, 2017, at 11:10 PM, Tal Mizrahi <[e-mail]> wrote:
>>>> 
>>>> Hi Loa,
>>>> 
>>>> 
>>>>>> - If the answer is yes: not sure replication and elimination makes 
>>>>>> sense for
>>> PTP.
>>>>> 
>>>>> Why is that?
>>>> 
>>>> In order for PTP to work well, PTP packets have to be consistently 
>>>> sent over the
>>> same path. If packets are intermittently sent through two different 
>>> paths (with two different delays) the PTP slave will not be able to synchronize in a stable way.
>>>> However, it *does* make sense for PTP to be sent through two 
>>>> different paths
>>> *without* elimination at the end. Such path redundancy allows the slave 
>>> to always receive the sync information through both paths, which 
>>> actually allows more robust synchronization than over a single path.
>>>> 
>>>> So path redundancy is good for PTP, but elimination - not so good.
>>> 
>>> In a path redundancy case would the PTP messages on multiple paths be 
>>> exact copies a single origin PTP message or different PTP messages?
>>> 
>>> - JOuni
>>> 
>>> 
>>>> 
>>>> Cheers,
>>>> Tal.
>>>> 
>>>> 
>>>>> -----Original Message-----
>>>>> From: Loa Andersson [mailto:[e-mail]]
>>>>> Sent: Thursday, January 26, 2017 9:01 AM
>>>>> To: Tal Mizrahi; [e-mail]
>>>>> Subject: [EXT] Re: [Detnet-dp-dt] Data Plane Approach - 
>>>>> Synchronization Traffic
>>>>> 
>>>>> External Email
>>>>> 
>>>>> --------------------------------------------------------------------
>>>>> -
>>>>> -
>>>>> Tal,
>>>>> 
>>>>> On 2017-01-26 14:44, Tal Mizrahi wrote:
>>>>>> Hi,
>>>>>> 
>>>>>> I realize this is a bit off-topic, but one of the things I am 
>>>>>> wondering about is how
>>>>> synchronization traffic (PTP) is forwarded in the context of the 
>>>>> data plane approaches we have been considering.
>>>>>> Is PTP transported as a DETNET flow?
>>>>>> - If the answer is no: does that mean we are assuming that 
>>>>>> synchronization is
>>>>> achieved at a different layer, possibly requiring dedicated 
>>>>> communication between the customer and provider?
>>>>>> - If the answer is yes: not sure replication and elimination makes 
>>>>>> sense for
>>> PTP.
>>>>> 
>>>>> Why is that?
>>>>> 
>>>>> /Loa
>>>>>> 
>>>>>> Will be happy to hear your thoughts, and apologies if this has 
>>>>>> already been
>>>>> discussed elsewhere and I am not aware.
>>>>>> 
>>>>>> Cheers,
>>>>>> Tal.
>>>>>> _______________________________________________
>>>>>> Detnet-dp-dt mailing list
>>>>>> [e-mail]
>>>>>> https://www.ietf.org/mailman/listinfo/detnet-dp-dt
>>>>>> 
>>>>> 
>>>>> --
>>>>> 
>>>>> 
>>>>> Loa Andersson                        email: [e-mail]
>>>>> Senior MPLS Expert                          [e-mail]
>>>>> Huawei Technologies (consultant)     phone: [phone]
>>>> 
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