Re: [Detnet-dp-dt] a quick look at the replication/discarding case for detnet flows

[Loa Andersson <[e-mail]>]

Yuanlong,


On 2017-01-14 19:45, Jiangyuanlong wrote:
> Loa,
>
> Thank a lot for the slides, a very good start!

Tnx!

> Maybe we just need one layer of PW label,

Currently I dob't see how this would work, can you explain plz?

> while redefine the MS-PW paradigm to support DetNet data plane.

This a very tricky approach, we would need to "tweak" the paradigm
in a backwards compatibel way.
I tend to think that if we add replication and discarding at merege
point this is a big enough "tweak".

> The T-PEs as defined in the PWE3 can encapsulate/de-capsulate the DetNet frames,

yes - the PW paradigm allows you to add whatever encapsulation we need.

  and generate the sequence number.

Yes the function is there to guarantee that packets are not re-ordred.

> The S-PEs usually can swap the PW label or terminate the PW completely;

wouldn't terminating the PW make the S-PE into a T-PE, isn't at the
core of the definition of S-PE and T-PE?

  we can extend their operations to support replication and filtering 
based on the sequence number.

I - think yes, that cam be done, but I don't see that filtering on the 
sequence number is enough, some context (e.g. label) is needed, right?

> LSP FECs can work as in the traditional MPLS,

yes they will, but I thought that the consensus in the meeting were that
we don't want non-detnet traffic sharing the transport of detnet, right?

but if any new DetNet mechanism is needed in P nodes in the future, we
can also add new FECs quite conveniently.

Yes it can be done, but I think we need from the start to avoid piggy-
backing of non-detnet traffic.

/Loa


>
> Thanks,
> Yuanlong
>
>
>
> -----Original Message-----
> From: Detnet-dp-dt [mailto:[e-mail]] On Behalf Of Loa Andersson
> Sent: Saturday, January 14, 2017 12:29 PM
> To: [e-mail]
> Subject: [Detnet-dp-dt] a quick look at the replication/discarding case for detnet flows
>
> Folks,
>
> I took a quick look at the replication / discarding case we talked about at the meeting this week.
>
> Please remember that so far this is not a proposal, just a demonstration that there is at least one way of doing it.
>
> What is there can bee revised, improved, changed or discarded if we find something better. Take a look a send comments.
>
> /loa
>
> Warning: I have a grave case of dyslexia, so any odd or inventive spelling is pure accident.
>

-- 


Loa Andersson                        email: [e-mail]
Senior MPLS Expert                          [e-mail]
Huawei Technologies (consultant)     phone: [phone]