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Re: [Detnet-dp-dt] where do I find the sequence number

Balázs Varga A <balazs.a.varga@ericsson.com> Fri, 13 January 2017 14:26 UTC

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From: =?iso-8859-1?Q?Bal=E1zs_Varga_A?= <balazs.a.varga@ericsson.com>
To: Loa Andersson <loa@pi.nu>, "detnet-dp-dt@ietf.org" <detnet-dp-dt@ietf.org>
Thread-Topic: [Detnet-dp-dt] where do I find the sequence number
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Subject: Re: [Detnet-dp-dt] where do I find the sequence number
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Hi Loa,
I think yes. We have made just very basic math.
- 100G interface with 64 byte packets results roughly 200 million packets per second.
- 2^28 = 268 million different values
- transport delay difference should be << 1 sec 
So, with 28 bits You are fine even in extreme cases.
Cheers
Bala!zs

-----Original Message-----
From: Detnet-dp-dt [mailto:detnet-dp-dt-bounces@ietf.org] On Behalf Of Loa Andersson
Sent: Friday, January 13, 2017 10:02 AM
To: Balázs Varga A <balazs.a.varga@ericsson.com>om>; detnet-dp-dt@ietf.org
Subject: Re: [Detnet-dp-dt] where do I find the sequence number

Balázs,

Tnx, OK I'm on the same page :).

Question: If we could use 28 bits would that be enough?

/Loa

On 2017-01-13 14:30, Balázs Varga A wrote:
> Hi Loa,
>
> For the PW scenario the Control Word is envisioned to provide 
> sequencing services, and so the CW would be mandatory for DetNet flows.
>
> We have identified one issue with the CW, namely the size of the 
> sequence number in a generic CW is 16 bits. Depending on the link and 
> the DetNet flow speed it may be too little.
>
> Cheers
> Bala'zs
>
> -----Original Message-----
> From: Detnet-dp-dt [mailto:detnet-dp-dt-bounces@ietf.org] On Behalf Of 
> Loa Andersson
> Sent: Friday, January 13, 2017 5:24 AM
> To: detnet-dp-dt@ietf.org
> Subject: [Detnet-dp-dt] where do I find the sequence number
>
> Folks,
>
> I'm thinking about the discussion we had last meeting, to avoid silly mistakes, one question.
>
> In the case we have the detnet PW running over MPLS, where do we place the sequence number.
>
> Is it part of the PW payload?
>
> /Loa
>

-- 


Loa Andersson                        email: loa@mail01.huawei.com
Senior MPLS Expert                          loa@pi.nu
Huawei Technologies (consultant)     phone: +46 739 81 21 64

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