Re: [DMM] 6.6. T.M.GTP4.D description (Re: I-D Action: draft-ietf-dmm-srv6-mobile-uplane-05.txt

Thanks Kentaro for you prompt review prior to my announce. :-)

> Thank you for updating the draft. Nice to see T.M.Tmap was renamed to T.M.GTP4.D corresponding to End.M.GTP4.E. :)

It helps to improve consistency of the draft, thanks.

> Some feedback about the updated description.
> 
> > 6.6. T.M.GTP4.D
> > ...
> > The prefix of B’ SHOULD be an End.M.GTP4.E SID with its format
> > instantiated at an SR gateway with the IPv4 SA of the receiving
> > packet.
> 
> "The B’" is IPv6 SA so I think this should correspond to S' in End.M.GTP4.E rather than to SID.

Actually no, because it is assumed that the prefix of B’ could be a SID for End.GTP4.E instantiated in SRGW. But you’re correct the B’ doesn’t need to be filled with arg.mob.session.

Cheers,
--satoru

> So it might be more clear to depict the packet format (diagram) again and mention B' has the following format with the IPv4 SA of the receiving packet.
> 
> 0                                                         127
> +----------------------+--------+--------------------------+
> | Source UPF Prefix    |IPv4 SA | any bit pattern(ignored) |
> +----------------------+--------+--------------------------+
>        128-a-b             a                 b
> 
> -- 
> Kentaro Ebisawa <ebiken.g@gmail.com>
> 
> ------ Original Message ------
> From: internet-drafts@ietf.org
> To: i-d-announce@ietf.org
> Cc: dmm@ietf.org
> Sent: 2019/07/08 21:16:07
> Subject: [DMM] I-D Action: draft-ietf-dmm-srv6-mobile-uplane-05.txt
> 
>>  
>> A New Internet-Draft is available from the on-line Internet-Drafts directories.
>> This draft is a work item of the Distributed Mobility Management WG of the IETF.
>>  
>>        Title           : Segment Routing IPv6 for Mobile User Plane
>>        Authors         : Satoru Matsushima
>>                          Clarence Filsfils
>>                          Miya Kohno
>>                          Pablo Camarillo
>>                          Daniel Voyer
>>                          Charles E. Perkins
>> Filename        : draft-ietf-dmm-srv6-mobile-uplane-05.txt
>> Pages           : 28
>> Date            : 2019-07-08
>>  
>> Abstract:
>>   This document shows the applicability of SRv6 (Segment Routing IPv6)
>>   to the user-plane of mobile networks.  The network programming nature
>>   of SRv6 accomplish mobile user-plane functions in a simple manner.
>>   The statelessness of SRv6 and its ability to control both service
>>   layer path and underlying transport can be beneficial to the mobile
>>   user-plane, providing flexibility, end-to-end network slicing and SLA
>>   control for various applications.  This document describes the SRv6
>>   mobile user plane behavior and defines the SID functions for that.
>>  
>>  
>> The IETF datatracker status page for this draft is:
>> https://datatracker.ietf.org/doc/draft-ietf-dmm-srv6-mobile-uplane/
>>  
>> There are also htmlized versions available at:
>> https://tools.ietf.org/html/draft-ietf-dmm-srv6-mobile-uplane-05
>> https://datatracker.ietf.org/doc/html/draft-ietf-dmm-srv6-mobile-uplane-05
>>  
>> A diff from the previous version is available at:
>> https://www.ietf.org/rfcdiff?url2=draft-ietf-dmm-srv6-mobile-uplane-05
>>  
>>  
>> Please note that it may take a couple of minutes from the time of submission
>> until the htmlized version and diff are available at tools.ietf.org.
>>  
>> Internet-Drafts are also available by anonymous FTP at:
>> ftp://ftp.ietf.org/internet-drafts/
>>  
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