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From: "Sri Gundavelli (sgundave)" <sgundave@cisco.com>
To: "Pablo Camarillo (pcamaril)" <pcamaril=40cisco.com@dmarc.ietf.org>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From: Satoru Matsushima <satoru.matsushima@gmail.com>
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Date: Wed, 14 Jul 2021 23:06:39 +0900
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Subject: [DMM] Our next DMM meeting
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Dear DMMers,

As the circumstance is changing and our discussion progress, the DMM WG chai=
rs have decided that our next meeting will be IETF112 in Madrid. On-site mee=
ting would help us to host more intensive discussions rather than on-line in=
 limited slot and time.

We really look forward that we can meet in Madrid safely in person.

Cheers,
--
Sri & Dapeng & Satoru


From nobody Wed Jul 14 12:55:51 2021
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Sri Gundavelli (sgundave)" <sgundave=40cisco.com@dmarc.ietf.org>, "Pablo Camarillo (pcamaril)" <pcamaril=40cisco.com@dmarc.ietf.org>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dmm/QdwetgYWVHpnvxOHkjUybFQc_FE>
Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Hi,

Here is my summary.

General comments:

1. There were some architecture discussions about SRv6-transporting-GTPu vs=
 SRv6-replacing-GTPu. I understand that this document is about SRv6-replaci=
ng-GTPu and the other is out of scope. That's ok - but the draft should omi=
t "3.  Motivation" and just have an informational reference to draft-kohno-=
dmm-srv6mob-arch. In other words, defer the motivation discussion to the se=
parate draft and just focus on technical details in this spec. BTW - I want=
 to clarify here that when I said "the only advantage of SRv6-replacing-GTP=
u is MTU savings" is *in comparison* to SRv6-transporting-GTPu.
2. I don't think it is good to categorize into "traditional mode" and "enha=
nced mode" (note that I am not saying that an operator does not have a choi=
ce in what it wants to deploy - it's just that the categorization itself is=
 strange), though that's not technically critical.
3. draft-murakami-dmm-user-plane-message-encoding should be a normative ref=
erence.

Specific outstanding technical comments:

4. In 5.3, for uplink traffic, the GW has End.M.GTP6.D for the UPF address =
B and the gNB does not need to know the existence of GW. For downlink traff=
ic, the UPF knows there is a GW and put the GW::TEID in the SRH. Why not ma=
ke GW invisible to UPF as well and just use gNB::TEID, and then have gNB/96=
 as End.M.GTP6.E on the SRGW? You can still put GW in the SRH to steer traf=
fic through the GW.
5. In 5.2.2, because of the END.DX2/4/6 behavior on gNB, the SID list and S=
1_out can't just simply use gNB. It must be gNB:TEID.
6. I still don't agree with the aggregation statement in 5.2.3. Per 5.2.2 (=
and see #5 above), the gNB does END.DX2/4/6 so per-UE SID (based on N2/4-si=
gnaled TEID) is needed. Otherwise, gNB needs to forward traffic based on in=
ner header (UE address), which is different from both 5.2.2 and normal gNB =
behavior.
7. (this is new) 5.2.2 says " gNB's  control plane associates that session =
from the UE(A) with the IPv6 address B.  gNB's control plane does a lookup =
on B to find the related SID list <S1, C1, U2::1> ... When the packet arriv=
es at UPF2, the active segment (U2::1) is an End.DT4/End.DT6/End.DT2U". End=
.DT4/6/2U requires specific tables for lookup (to go to different DNs in th=
is case) and the text is not clear on how that table is determined. Differe=
nt UEs could be associated with different DNs but the N2 signaling can give=
 the same IPv6 address B. In GTP-U case, the UPF is able to associate diffe=
rent UEs to different DNs based on TEID but for SRv6 different mechanism is=
 needed (and missing for now). It could be that the control plane will give=
 out different address B for different DNs but that needs to be spelled out=
.

There may be other minor points/nits. For example, 5.1 says N2/N4 is unchan=
ged while 5.2 only says N2 is unchanged. Does 5.2 imply/need N4 change? Goo=
d to be explicit.

BTW - while trying to confirm whether N4 needs to be changed for 5.2, I not=
iced the following in section 9:

   The control plane could be the current 3GPP-defined control plane
   with slight modifications to the N4 interface [TS.29244].

It should be clarified what kind of modifications to the N4 is needed and f=
or what scenario.

Jeffrey

-----Original Message-----
From: dmm <dmm-bounces@ietf.org> On Behalf Of Sri Gundavelli (sgundave)
Sent: Wednesday, July 7, 2021 2:59 PM
To: Pablo Camarillo (pcamaril) <pcamaril=3D40cisco.com@dmarc.ietf.org>
Cc: dmm@ietf.org
Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mob=
ile-uplane-13

[External Email. Be cautious of content]


Authors:

Can you please summarize the discussions and identify the open issues, or a=
reas of non-agreement that have come up as part of this WGCLC

Thanks
Sri



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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang=40juniper.net@dmarc.ietf.org>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Date: Wed, 21 Jul 2021 17:34:53 +0000
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Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang=40juniper.net@dmarc.ietf.org>
CC: "Sri Gundavelli (sgundave)" <sgundave@cisco.com>, "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Date: Wed, 21 Jul 2021 17:37:09 +0000
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Hi Jeffrey,

Many thanks for the summary of the open items.=20
See inline with [PC].

Cheers,
Pablo.

> -----Original Message-----
> From: Jeffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
> Sent: mi=E9rcoles, 14 de julio de 2021 21:56
> To: Sri Gundavelli (sgundave) <sgundave@cisco.com>; Pablo Camarillo
> (pcamaril) <pcamaril@cisco.com>
> Cc: dmm@ietf.org
> Subject: RE: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-
> mobile-uplane-13
>=20
> Hi,
>=20
> Here is my summary.
>=20
> General comments:
>=20
> 1. There were some architecture discussions about SRv6-transporting-GTPu =
vs
> SRv6-replacing-GTPu. I understand that this document is about SRv6-replac=
ing-
> GTPu and the other is out of scope. That's ok - but the draft should omit=
 "3.
> Motivation" and just have an informational reference to draft-kohno-dmm-
> srv6mob-arch. In other words, defer the motivation discussion to the sepa=
rate
> draft and just focus on technical details in this spec. BTW - I want to c=
larify
> here that when I said "the only advantage of SRv6-replacing-GTPu is MTU
> savings" is *in comparison* to SRv6-transporting-GTPu.

[PC] I have mixed feelings about removing the Section 3(Motivation).
[PC] Stating a couple of paragraphs of motivation is useful to the reader, =
while -if they want details- then they could jump to the draft-kohno for th=
e specifics.
[PC] That said, I also see the point that a Standards Track document should=
 only focus on the technical details and do not discuss such things.
[PC] I'm fine either way (remove or keep). I don't have any preference. I'm=
 the document editor: I'll edit the document to whatever the WG prefers.

> 2. I don't think it is good to categorize into "traditional mode" and "en=
hanced
> mode" (note that I am not saying that an operator does not have a choice =
in
> what it wants to deploy - it's just that the categorization itself is str=
ange),
> though that's not technically critical.

[PC] As the I-D states
"   The traditional mode minimizes the changes required to the mobile
   system; hence it is a good starting point for forming a common
   ground."
[PC] Since 2017 the wg guidance/consensus was to have these two modes for t=
hat reason above.

> 3. draft-murakami-dmm-user-plane-message-encoding should be a normative
> reference.

[PC] I believe it's fine as an informative reference. One could implement t=
his draft without draft-murakami. (While I agree with you that it will be c=
ommon to implement both)

>=20
> Specific outstanding technical comments:
>=20
> 4. In 5.3, for uplink traffic, the GW has End.M.GTP6.D for the UPF addres=
s B and
> the gNB does not need to know the existence of GW. For downlink traffic, =
the
> UPF knows there is a GW and put the GW::TEID in the SRH. Why not make GW
> invisible to UPF as well and just use gNB::TEID, and then have gNB/96 as
> End.M.GTP6.E on the SRGW? You can still put GW in the SRH to steer traffi=
c
> through the GW.

[PC] Replied in the other thread.

> 5. In 5.2.2, because of the END.DX2/4/6 behavior on gNB, the SID list and
> S1_out can't just simply use gNB. It must be gNB:TEID.

[PC] Replied in the other thread. TEID is not present. It is a specific SID=
 instance.

> 6. I still don't agree with the aggregation statement in 5.2.3. Per 5.2.2=
 (and see
> #5 above), the gNB does END.DX2/4/6 so per-UE SID (based on N2/4-signaled
> TEID) is needed. Otherwise, gNB needs to forward traffic based on inner
> header (UE address), which is different from both 5.2.2 and normal gNB
> behavior.

[PC] I don't follow your point. You have stated in previous emails that agg=
regation can be done, hence I don't understand which part of the statement =
you disagree with.
"Aggregation can be done for traditional GTP-U, SRv6 transported GTP-U, or =
SRv6 replacing GTP-U."
https://mailarchive.ietf.org/arch/msg/dmm/Fv98rJ_PLyg5PNrQdnOa8g-1-EQ/

> 7. (this is new) 5.2.2 says " gNB's  control plane associates that sessio=
n from the
> UE(A) with the IPv6 address B.  gNB's control plane does a lookup on B to=
 find
> the related SID list <S1, C1, U2::1> ... When the packet arrives at UPF2,=
 the
> active segment (U2::1) is an End.DT4/End.DT6/End.DT2U". End.DT4/6/2U
> requires specific tables for lookup (to go to different DNs in this case)=
 and the
> text is not clear on how that table is determined. Different UEs could be
> associated with different DNs but the N2 signaling can give the same IPv6
> address B. In GTP-U case, the UPF is able to associate different UEs to d=
ifferent
> DNs based on TEID but for SRv6 different mechanism is needed (and missing
> for now). It could be that the control plane will give out different addr=
ess B for
> different DNs but that needs to be spelled out.
>=20
> There may be other minor points/nits. For example, 5.1 says N2/N4 is
> unchanged while 5.2 only says N2 is unchanged. Does 5.2 imply/need N4
> change? Good to be explicit.

[PC] Control-plane is out of the scope of this document.

>=20
> BTW - while trying to confirm whether N4 needs to be changed for 5.2, I
> noticed the following in section 9:
>=20
>    The control plane could be the current 3GPP-defined control plane
>    with slight modifications to the N4 interface [TS.29244].
>=20
> It should be clarified what kind of modifications to the N4 is needed and=
 for
> what scenario.

[PC] Control-plane is out of the scope of this document. Section 9 provides=
 some considerations, and refers to some technologies that could be used. I=
 don't think any further text should be added -quite the contrary, we shoul=
d remove-.

>=20
> Jeffrey
>=20
> -----Original Message-----
> From: dmm <dmm-bounces@ietf.org> On Behalf Of Sri Gundavelli (sgundave)
> Sent: Wednesday, July 7, 2021 2:59 PM
> To: Pablo Camarillo (pcamaril) <pcamaril=3D40cisco.com@dmarc.ietf.org>
> Cc: dmm@ietf.org
> Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-
> mobile-uplane-13
>=20
> [External Email. Be cautious of content]
>=20
>=20
> Authors:
>=20
> Can you please summarize the discussions and identify the open issues, or
> areas of non-agreement that have come up as part of this WGCLC
>=20
> Thanks
> Sri
>=20
>=20
>=20
> _______________________________________________
> dmm mailing list
> dmm@ietf.org
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>=20
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>=20
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From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
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You asserted that certain needs can not be met without the changes to 
the 3GPP architecture this draft calls for.

Clearly, 3GPP does not agree as they have declined to make the changes 
you are asking for.

Equally, the IETF appears not to agree, as we have some approaches that 
appear to work without these changes, and are developing others.  (I 
admit this is an individual judgment, but then so is the problem kohno 
draft you are pointing at.)

More importantly, the IETF has no business changing the 3GPP 
architecture.  We object (have in the past, and expect would in the 
future) when people change IETF architecturse externally to the IETF. 
We owe other SDOs the same respect.

Yours,
Joel

On 7/21/2021 1:34 PM, Pablo Camarillo (pcamaril) wrote:
> Hi Joel,
> 
> I believe the TEAS slicing framework is orthogonal and complementary to this. This draft, and many other technologies around IETF, will benefit from the slicing framework of TEAS.
> Nonetheless, the text below is one of the key motivations, but not the only one. More details on the other key points in here: draft-kohno-dmm-srv6mob-arch-04
> 
> Many thanks,
> Pablo.
> 
> -----Original Message-----
> From: Joel M. Halpern <jmh@joelhalpern.com>
> Sent: miércoles, 16 de junio de 2021 0:03
> To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
> Cc: dmm@ietf.org
> Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
> 
> Actually, assuming that the IETF TEAS network slicing definitions / framework and follow-on work is successful, it should be quite possible to deliver appropriate services (network sliced service based on IETF network slices) to 3GPPP GTP encapsulated 5G traffic while using the GTP-U encapsulation.  SRv6 is likely to be one of several transport mechanisms available to do so.
> 
> So if the inability to do so is the premise of your document, it appears to me that there is no need for the document.
> 
> Yours,
> Joel
> 
> PS: In fact, it is pretty clear that the needed services can be delivered even now in conjunction with GTP.  The TEAS work will make managing and coordinating that delivery interoperably easier.
> 
> On 6/15/2021 3:01 PM, Pablo Camarillo (pcamaril) wrote:
>> Hi Jeffrey,
>>
>> I've already provided one of the key motivations in my previous email. There is an operational challenge in the current mobility networks: there are no means to have a fine-granular SLA across both the mobile and the transport network. SRv6 is bridging this gap by integrating the underlay and the overlay control from the source node (either the gNB or the UPF).
>> I am not aware of any standardized solution that solves this problem.
>> Therefore, I disagree on your statement "the only benefit of SRv6-replacing-GTP-U is the MTU saving between SRv6 tunnel endpoints".
>>
>> Cheers,
>> Pablo.
>>
>> -----Original Message-----
>> From: Jeffrey (Zhaohui) Zhang <zzhang=40juniper.net@dmarc.ietf.org>
>> Sent: lunes, 14 de junio de 2021 22:19
>> To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
>> Cc: dmm@ietf.org
>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> Hi Pablo,
>>
>> As you have alluded to, we're not converging but that's ok.
>>
>> My point is not to write a draft about SRv6-transported-GTP-U (there is no need for such draft, just like we don't need another draft about "transporting foo" with SRv6). My point is that the only benefit of SRv6-replacing-GTP-U is the MTU saving between SRv6 tunnel endpoints.
>>
>> There are other details that need to be taken care of in the draft, which we have been discussing.
>>
>> Jeffrey
>>
>> -----Original Message-----
>> From: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>
>> Sent: Monday, June 14, 2021 3:47 PM
>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>> Cc: dmm@ietf.org
>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> [External Email. Be cautious of content]
>>
>>
>> Hi Jeffrey,
>>
>> Inline with [PC6]. Many thanks for your explicit answers.
>>
>> Cheers,
>> Pablo.
>>
>> -----Original Message-----
>> From: Jeffrey (Zhaohui) Zhang <zzhang=40juniper.net@dmarc.ietf.org>
>> Sent: lunes, 14 de junio de 2021 21:01
>> To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
>> Cc: dmm@ietf.org
>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> Hi Pablo,
>>
>> Let me also copy (zzh2>, zzh3>) and explicitly add (zzh4>) my answers below.
>>
>> -----Original Message-----
>> From: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>
>> Sent: Monday, June 14, 2021 2:22 PM
>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>> Cc: dmm@ietf.org
>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> [External Email. Be cautious of content]
>>
>>
>> Jeffrey,
>> Inline with [PC5].
>> Cheers,
>> Pablo.
>>
>> -----Original Message-----
>> From: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>> Sent: lunes, 14 de junio de 2021 19:32
>> To: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>;
>> Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
>> Cc: dmm@ietf.org
>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> Hi Pablo,
>>
>> If we look at the my original points:
>> [PC5] Jeffrey, I believe both of your points have been answered. I've copied the relevant answers for your reference here below with PC, PC2 and PC4. Answer does not differ. If any clarification is needed on my previous answers, please let me know. Thanks.
>>
>> -------
>> 1. Since GTP-U can be transported over SRv6, which can also make use of TE capability and used for service programing (NFS chaining), the only real difference between SRv6 tunnel and GTP-U tunnel is that the UDP/GTP-U header is no longer needed in the SRv6 tunnel case (in particular, the GTP-U TEID becomes part of the IPv6 address). With that, most of " 3.  Motivation" are not really applicable.
>> [PC] The integration of the overlay with the underlay SLA and service chaining cannot be achieved with GTP-U.
>> [PC2] As documented in 5.2, the SID list imposed by the source node includes segments for traffic engineering, NFV, and the overlay creation -all within the context of one network slice-. All the intermediate nodes in the fabric are stateless, hence you achieve highly scalable SLA.
>> [PC2] With an SRv6 transported GTP-U, the gNB only inserts the GTP-U header. Then the cell site router needs to do a mapping of GTP-U sessions to SLA policies. This implies that you need some mapping mechanism at the Cell Site Router, that needs to have state. The gNB will not have any control of the underlay path, ...
>>
>> Zzh2> For SRv6-transported GTP-U, why can't the gNB itself put on the appropriate SRH like in the SRv6-replacing-GTP-U case?
>> Zzh2> As quoted/discussed later, even in SRv6-replacing-GTU-U case, the gNB does not get the SRv6 information from the AMF:
>>      The gNB MAY resolve the IP address received via the control plane
>>      into a SID list using a mechanism like PCEP, DNS-lookup, LISP
>>      control-plane or others.  The resolution mechanism is out of the
>>      scope of this document.
>> Zzh2> With that, even if you have a separate device to do the mapping, why can't that device do the same?
>> Zzh2> In other words, I still don’t see difference wrt SLA between SRv6-transported-GTP-U and SRv6-replacing-GTP-U.
>> [PC3] If the gNB also adds the SRH as you suggest, then you are changing the N3/N9 interface as well.
>>
>> Zzh3> Wouldn't it be the other way around - SRv6-replacing-GTP-U is "changing the N3/N9 interface"? SRv6-transported-GTU-U is still the same N3/N9 interface, just that now they have SRH for traffic steering purpose.
>> [PC4] SRv6-replacing-GTP-U is a change in the N3/N9 interface.
>>
>> Zzh4> I said in zzh2> that with SRv6-transported-GTP-U, gNB could also add traffic steering via SRH - no different from SRv6-replacing-GTP-U. You said that's changing N3/N9, and I replied in zzh3> SRv6-replacing-GTP-U is changing the N3/N9, which you confirmed in [PC4]. Therefore, you have not really countered zzh2> above.
>> [PC6] There are no means to have fine-grained mapping of transport SLA with the mobility SLA.
>> [PC6] Any transport protocol that encapsulates the gNB packet in the cell site router cannot achieve fine-grained SLA due to scaling limitations and control plane complexity.
>> [PC6] One option to solve this problem is to use SRv6 as a replacement to GTP-U, whereas the gNB encodes the SLA in the packet. This is what this draft is about.
>> [PC6] Certainly you write a new I-D to define a new N3/N9 interfaces that bundle together the overlay and underlay protocols (e.g. the gNB pushes the GTP-U header together with the MPLS label stack of the transport). I don't see the benefits of such approach, and this draft is not proposing anything close to it.
>>
>> -------
>> Aggregation can be done for traditional GTP-U, SRv6 transported GTP-U, or SRv6 replacing GTP-U.
>> [PC4] I'm not aware that 29.281 allows aggregating N3/N9 traffic from different TEIDs into the same TEID -despite from any local policy-. That said, this I-D is not proposing a change in GTPU. Hence, any discussion on GTPU aggregation or change to allow it in GTP-U is out of the scope of this draft.
>> -------
>> Zzh4> It's not clear why you would refer to 29.281 - since it certainly does not talk about SRv6 either. Local policy means it's local behavior based on unchanged N2/N4 - if you play SRv6 tricks for aggregation one can certainly play other tricks for GTP-U based on local policy. I understand that aggregation in GTP-U (via local policy) is outside the scope of this draft and I am not suggesting to add that - my point is only that the aggregation benefit is not only enabled by or exclusive to SRv6.
>> [PC6] I completely agree with you. Aggregation can be achieved with GTP-U. It needs to be modified first though, as 29.281 -or any other 3GPP spec- does not seem to allow it; while in the case of SRv6 we are writing an I-D that explicitly allows it.
>> [PC6] Please let me know if there is any action item with respect to this comment on this I-D. As said, GTP-U aggregation is out of the scope of the document.
>> Zzh4> In summary, the benefit of SRv6-replacing-GTP-U is really just the MTU saving between the SRv6 endpoints, and I have not seen a real counter argument against that.
>> [PC6] I disagree with this comment for the reasons exposed above.
>> Zzh4> Jeffrey
>> [PC6] Please let me know whether there is any extra clarification needed.
>>
>> Our exchanges had some clarifications on details, but I don't think the above points have been invalidated.
>> [PC5] Please let me know whether there is any clarification needed on top of the previous answers.
>>
>> Jeffrey
>>
>> -----Original Message-----
>> From: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>
>> Sent: Monday, June 14, 2021 1:16 PM
>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>; Pablo Camarillo
>> (pcamaril) <pcamaril@cisco.com>
>> Cc: dmm@ietf.org
>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> [External Email. Be cautious of content]
>>
>>
>> Hi Jeffrey,
>> Inline with PC4.
>> Pablo.
>>
>> -----Original Message-----
>> From: dmm <dmm-bounces@ietf.org> On Behalf Of Jeffrey (Zhaohui) Zhang
>> Sent: lunes, 14 de junio de 2021 18:00
>> To: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>
>> Cc: dmm@ietf.org
>> Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> Hi Pablo,
>>
>> Please see zzh3> below. I don't agree with the two [PC3] points.
>>
>> -----Original Message-----
>> From: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>
>> Sent: Friday, June 11, 2021 10:17 AM
>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>> Cc: dmm@ietf.org
>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> [External Email. Be cautious of content]
>>
>>
>> Hi Jeffrey,
>>
>> Inline with [PC3].
>>
>> Thanks,
>> Pablo.
>>
>> -----Original Message-----
>> From: dmm <dmm-bounces@ietf.org> On Behalf Of Jeffrey (Zhaohui) Zhang
>> Sent: lunes, 7 de junio de 2021 15:58
>> To: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>
>> Cc: dmm@ietf.org
>> Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> Hi Pablo,
>>
>> Please see zzh2> below.
>>
>> -----Original Message-----
>> From: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>
>> Sent: Friday, June 4, 2021 12:53 PM
>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>> Cc: dmm@ietf.org
>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> [External Email. Be cautious of content]
>>
>>
>> Inline with PC2.
>> Many thanks and have a good weekend.
>>
>> -----Original Message-----
>> From: Jeffrey (Zhaohui) Zhang <zzhang=40juniper.net@dmarc.ietf.org>
>> Sent: martes, 1 de junio de 2021 16:46
>> To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
>> Cc: dmm@ietf.org
>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> Hi Pablo,
>>
>> Please see zzh> below.
>>
>> -----Original Message-----
>> From: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>
>> Sent: Tuesday, June 1, 2021 7:23 AM
>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>> Cc: dmm@ietf.org
>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> [External Email. Be cautious of content]
>>
>>
>> Hi Jeffrey,
>>
>> Thanks for the reviews. Answers inline with [PC].
>>
>> Thanks,
>> Pablo.
>>
>> -----Original Message-----
>> From: dmm <dmm-bounces@ietf.org> On Behalf Of Jeffrey (Zhaohui) Zhang
>> Sent: martes, 1 de junio de 2021 4:33
>> To: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>;
>> dmm@ietf.org
>> Subject: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> After many email exchanges and seeing two revisions (-12, -13), I now have a much better understanding of the draft. Here my further observations/understanding/comments.
>>
>> Observations/Understanding:
>>
>> A. This does *not* require *any* changes in the N2/N4 signaling. AMF/SMF/gNB/UPF will still use existing signaling based on GTP-U, but gNB/UPF will use either SRv6 or GTP-U tunnels based on local policy.
>> B. If both ends (gNB/UPF) of a tunnel use SRv6, no interworking is needed, and two modes (traditional/enhanced) are defined. This is in section 5.1 and 5.2 respectively.
>> C. If gNB does not use SRv6 but UPF does, an SRGW is placed next to the gNB. This is covered in 5.3 using enhanced mode example, but can be applied to traditional mode as well.
>> D. If neither gNB nor UPF uses SRv6, GTP-U tunnels could still be changed to SRv6 between two GWs - another SRGW is placed next to the UPF as well. This is covered in 5.4 and referred to as drop-in mode.
>>
>> [PC] All the observations look good, with a side note on A: Future documents may define a new signaling.
>>
>> Comments:
>>
>> 1. Since GTP-U can be transported over SRv6, which can also make use of TE capability and used for service programing (NFS chaining), the only real difference between SRv6 tunnel and GTP-U tunnel is that the UDP/GTP-U header is no longer needed in the SRv6 tunnel case (in particular, the GTP-U TEID becomes part of the IPv6 address). With that, most of " 3.  Motivation" are not really applicable.
>> [PC] The integration of the overlay with the underlay SLA and service chaining cannot be achieved with GTP-U.
>>
>> Zzh> Can you elaborate how they're achieved w/ SRv6 replacing GTP-U and not achieved with SRv6 transported GTP-U?
>> [PC2] As documented in 5.2, the SID list imposed by the source node includes segments for traffic engineering, NFV, and the overlay creation -all within the context of one network slice-. All the intermediate nodes in the fabric are stateless, hence you achieve highly scalable SLA.
>> [PC2] With an SRv6 transported GTP-U, the gNB only inserts the GTP-U header. Then the cell site router needs to do a mapping of GTP-U sessions to SLA policies. This implies that you need some mapping mechanism at the Cell Site Router, that needs to have state. The gNB will not have any control of the underlay path, ...
>> Zzh2> For SRv6-transported GTP-U, why can't the gNB itself put on the appropriate SRH like in the SRv6-replacing-GTP-U case?
>> Zzh2> As quoted/discussed later, even in SRv6-replacing-GTU-U case, the gNB does not get the SRv6 information from the AMF:
>>      The gNB MAY resolve the IP address received via the control plane
>>      into a SID list using a mechanism like PCEP, DNS-lookup, LISP
>>      control-plane or others.  The resolution mechanism is out of the
>>      scope of this document.
>> Zzh2> With that, even if you have a separate device to do the mapping, why can't that device do the same?
>> Zzh2> In other words, I still don’t see difference wrt SLA between SRv6-transported-GTP-U and SRv6-replacing-GTP-U.
>> [PC3] If the gNB also adds the SRH as you suggest, then you are changing the N3/N9 interface as well.
>>
>> Zzh3> Wouldn't it be the other way around - SRv6-replacing-GTP-U is "changing the N3/N9 interface"? SRv6-transported-GTU-U is still the same N3/N9 interface, just that now they have SRH for traffic steering purpose.
>> [PC4] SRv6-replacing-GTP-U is a change in the N3/N9 interface.
>> [PC4] SRv6-transported-GTP-U, if SRv6 is starting at the gNB and terminating at the UPF, to me it is also a change in N3/N9.
>> [PC4] SRv6-transported-GTP-U, if SRv6 is the transport starting at the cell site router, to me this is NOT a change in N3/N9.
>>
>> [PC2] By the way, the limitations of SRv6 transported GTP-U are also present in the Drop-in mode of this document.
>>
>> [PC] Actually you have a lot more of motivation in this document:
>> draft-kohno-dmm-srv6mob-arch-04
>>
>> Zzh> I had similar comments in that thread.
>>
>> 2. Besides the TEID, there are other parameters in the GTP-U header. How those are represented in the SRv6 header needs to be defined.
>> [PC] draft-murakami-dmm-user-plane-message-encoding-03
>>
>> Zzh> That should be a normative reference then.
>> [PC2] I don't think any of those is required to implement the I-D. I could foresee an operator that is interested on this ID to also be interested on that one, but I don’t think this is a reason to add the normative reference..
>> Zzh2> This document assumes that the 5G NFs will encode/decode SRv6 headers based on signaled GTP-U parameters, or GWs will convert between GTP-U and SRv6 headers. If that does not warrant a normative reference to draft-murakami, I am not sure what normative references are for. I'll defer this to chairs/ADs/IESG.
>>
>> 3. I still think there is no need to define the traditional/enhanced mode (see my reasoning below).
>> 4. Now it's not clear if the interworking mode (including the drop-in mode) is worth the trouble (see my reasoning at the end).
>> [PC] Answers to 3 and 4 below.
>>
>> Let me expand on #3 above.
>>
>> "5.1.  Traditional mode" focuses on the one-to-one mapping among (PDU session, GTP-U tunnel, SRv6 tunnel) and casually mentions "SID list only contains a single SID".
>> " 5.2.  Enhanced Mode" talks about two things: SID list for TE and service programing/chaining, and scalability improvement via aggregation.
>>
>> 5.2 says:
>>
>>      The gNB MAY resolve the IP address received via the control plane
>>      into a SID list using a mechanism like PCEP, DNS-lookup, LISP
>>      control-plane or others.  The resolution mechanism is out of the
>>      scope of this document.
>>
>> That means the use of SID list for TE and service programming is not per the mobile architecture, but purely per operator's choice [PC] Indeed. The operator is the one that decides whether traffic needs a particular SLA. As in wireline...
>> , and it can also be used for both traditional mode and SRv6-transported GTP-U tunnels - really nothing special to be limited to enhanced mode only.
>> It is true that some gNB may not be able to put on an SRH, but that equipment limitation should not become a criteria - just like that for general SRv6 (outside this mobile user plane context) we don't have "basic" vs. "advanced/enhanced" modes just because some devices cannot insert SRH.
>> [PC] The motivation behind traditional mode is:
>> "   The traditional mode minimizes the changes required to the mobile
>>      system; hence it is a good starting point for forming a common
>>      ground."
>>
>> Zzh> Why did we not have "basic" vs. "advanced/enhanced" modes for SRv6 in wireline networks 😊 There is no change to mobile system/architecture, except the transport network, which is no different from wireline.
>> [PC2] Fair point. 😉 I understand your opinion, but after three years the working group seemed to prefer the traditional mode. I note your preference.
>>
>> Defining traditional/enhanced mode based on aggregation is more reasonable. However, consider the following aspects:
>>
>> - Currently only up link traffic can benefit from aggregation, and
>> that's only when the AMF provides the same <UPF address, TEID> for
>> multiple PDU sessions
>> - The same can be done for traditional GTP-U, SRv6 transported GTP-U, or SRv6 replacing GTP-U.
>> [PC] GTP-U does not allow that. Certainly you could go to 3GPP and change the specs to allow it, but as per today it is not allowed.
>>
>> Zzh> We established that there is no change to N2/N4 or mobile architecture: AMF/SMF continue to signal GTP-U parameters like <tunnel endpoint, TEID> but gNB/UPF may use SRv6 replacing GTP-U per local policy. With that, how is uplink aggregation achieved?
>> [PC2] The local policy indicates to aggregate several bearers into the same SRv6 SID list.
>> Zzh2> For GTP-U, whether transported by SRv6 or not, traffic is routed based on the UPF/gNB address - that is aggregation already. If finer granularity is needed, similar local policy (to the ones used in SRv6-replacing-GTP-U case) can aggregate smaller subsets of UEs, right?
>> Zzh2> Basically, I really don't see any difference.
>> [PC3] As stated above, certainly you change the current GTP-U spec to allow aggregation as proposed in this I-D. However, the current GTP-U standard does not allow it.
>>
>> Zzh3> There is no change to GTP-U spec or N2/N4 interface. As stated above, it is the local policy (when finer granularity is needed) that does the aggregation - no different from SRv6-replacing-GTP-U.
>> [PC4] I'm not aware that 29.281 allows aggregating N3/N9 traffic from different TEIDs into the same TEID -despite from any local policy-. That said, this I-D is not proposing a change in GTPU. Hence, any discussion on GTPU aggregation or change to allow it in GTP-U is out of the scope of this draft.
>> Zzh3> Jeffrey
>>
>> Zzh2> Jeffrey
>>
>> Zzh> Thanks.
>> Zzh> Jeffrey
>>
>> The reason the aggregation is not applicable to downlink traffic is because the gNB does not do IP lookup based on inner header.
>> [PC] Indeed that is one option. That is new compared to today's mobile architecture. I don’t think its complex to implement though. End of the day we've done it for quite some time in wireline. Another option is to forward to a group of UEs and let the UE drop the packet based on the IPV6 DA.
>> Rather, downlink traffic forwarding on a gNB is purely based on TEID (whether it is in the GTP-U header or in the SRv6 SID). Therefore, the uplink aggregation or downlink aggregation (if gNB starts doing IP lookup based on inner header, which would be a big departure from existing architecture) is really controlled by the mobile architecture, not by the use of SRv6 tunnel. To achieve aggregation, the AMF/SMF will need to signal different GTP-U parameters, even though the signaling format does not need to change.
>>
>> As a result, defining traditional/enhanced mode for SRv6 user plane really is not necessary.
>> [PC] There is a motivation behind each of the modes. Operators find it easier to deploy this way.
>>
>> Now let me expand on #4 above.
>>
>> There is no real difference between SRv6-transported GTP-U  and SRv6 replacing GTP-U (other than that the latter does not have UDP/GTP-U headers). If both tunnel ends can support SRv6 natively, it's reasonable to use SRv6 tunnels (replacing GTP-U) right at the tunnel ends. But if a gNB has to start/end with GTP-U (with the UDP/GTP-U headers), what is the benefit of converting to/from SRv6 by a GW, which means additional capex/opex? It's an additional failure point - the implementation could have bugs and it could fail for various reasons. It may be better off to only do SRv6 tunneling when both ends can support it. It's not clear to me that the bandwidth saving between the GW and UPF is worth the trouble.
>> [PC] Well... there are two differences between SRv6-transported GTPU and SRv6 replacing GTP-U. The first and obvious is the removal of the UDP/GTP-U header -which already has huge benefits as the IPv6 Flow Label for entropy 😉-. The second and most interesting difference is that the SRv6 replacement of GTP-U allows the integration of the overlay with the underlay SLA and service chaining. More in draft-kohno-dmm-srv6mob-arch-04.
>>
>> These are high level comments. I may have more to come, and I definitely have more text/wording comments to share afterwards.
>>
>> Thanks.
>> Jeffrey
>>
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril=40cisco.com@dmarc.ietf.org>
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Thread-Topic: Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Pablo Camarillo (pcamaril)" <pcamaril=40cisco.com@dmarc.ietf.org>
CC: "Sri Gundavelli (sgundave)" <sgundave@cisco.com>, "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
Thread-Index: Add+IFRpgAhQZQMgRv2DyigIUKykpQAV89Gw
Date: Thu, 22 Jul 2021 14:36:04 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dmm/J0dRGetYR58SVLuwNEdk_UVtm1g>
Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Hi Pablo,

Please see zzh> below.

-----Original Message-----
From: Pablo Camarillo (pcamaril) <pcamaril=3D40cisco.com@dmarc.ietf.org>
Sent: Wednesday, July 21, 2021 1:37 PM
To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
Cc: Sri Gundavelli (sgundave) <sgundave@cisco.com>; dmm@ietf.org
Subject: RE: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mob=
ile-uplane-13

[External Email. Be cautious of content]


Hi Jeffrey,

Many thanks for the summary of the open items.
See inline with [PC].

Cheers,
Pablo.

> -----Original Message-----
> From: Jeffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
> Sent: mi=E9rcoles, 14 de julio de 2021 21:56
> To: Sri Gundavelli (sgundave) <sgundave@cisco.com>; Pablo Camarillo
> (pcamaril) <pcamaril@cisco.com>
> Cc: dmm@ietf.org
> Subject: RE: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-
> mobile-uplane-13
>
> Hi,
>
> Here is my summary.
>
> General comments:
>
> 1. There were some architecture discussions about SRv6-transporting-GTPu =
vs
> SRv6-replacing-GTPu. I understand that this document is about SRv6-replac=
ing-
> GTPu and the other is out of scope. That's ok - but the draft should omit=
 "3.
> Motivation" and just have an informational reference to draft-kohno-dmm-
> srv6mob-arch. In other words, defer the motivation discussion to the sepa=
rate
> draft and just focus on technical details in this spec. BTW - I want to c=
larify
> here that when I said "the only advantage of SRv6-replacing-GTPu is MTU
> savings" is *in comparison* to SRv6-transporting-GTPu.

[PC] I have mixed feelings about removing the Section 3(Motivation).
[PC] Stating a couple of paragraphs of motivation is useful to the reader, =
while -if they want details- then they could jump to the draft-kohno for th=
e specifics.
[PC] That said, I also see the point that a Standards Track document should=
 only focus on the technical details and do not discuss such things.
[PC] I'm fine either way (remove or keep). I don't have any preference. I'm=
 the document editor: I'll edit the document to whatever the WG prefers.

> 2. I don't think it is good to categorize into "traditional mode" and "en=
hanced
> mode" (note that I am not saying that an operator does not have a choice =
in
> what it wants to deploy - it's just that the categorization itself is str=
ange),
> though that's not technically critical.

[PC] As the I-D states
"   The traditional mode minimizes the changes required to the mobile
   system; hence it is a good starting point for forming a common
   ground."
[PC] Since 2017 the wg guidance/consensus was to have these two modes for t=
hat reason above.

> 3. draft-murakami-dmm-user-plane-message-encoding should be a normative
> reference.

[PC] I believe it's fine as an informative reference. One could implement t=
his draft without draft-murakami. (While I agree with you that it will be c=
ommon to implement both)

Zzh> Let me take one step back.
Zzh> This spec includes an option where SRv6 encapsulation/decapsulation ba=
sed on N2/N4-signaled GTP-U parameters, so I thought there must be a spec a=
bout how the GTP-U header fields are encoded in SRv6. If draft-murakami is =
that draft, then it must be a normative reference. If draft-murakami is not=
 that draft, then either all details need to be spelled out in this documen=
t, or some other document should be referenced (normatively).
Zzh> It seems that you're saying draft-murakmi is a separate/parallel thing=
. If so, which spec talks about how the GTP extension headers, sequence num=
ber, N-PDU number are encoded? If those are not expected to be used/support=
ed, it needs to be pointed out.

+       0-2     3       4       5       6       7       8-15    16-23   24-=
31
0       Version Protocol type   Reserved        Extension Header Flag   Seq=
uence Number Flag    N-PDU Number Flag       Message Type    Message length
32      TEID
64      Sequence number N-PDU number    Next extension header type

>
> Specific outstanding technical comments:
>
> 4. In 5.3, for uplink traffic, the GW has End.M.GTP6.D for the UPF addres=
s B and
> the gNB does not need to know the existence of GW. For downlink traffic, =
the
> UPF knows there is a GW and put the GW::TEID in the SRH. Why not make GW
> invisible to UPF as well and just use gNB::TEID, and then have gNB/96 as
> End.M.GTP6.E on the SRGW? You can still put GW in the SRH to steer traffi=
c
> through the GW.

[PC] Replied in the other thread.
Zzh> I did not see it there?

> 5. In 5.2.2, because of the END.DX2/4/6 behavior on gNB, the SID list and
> S1_out can't just simply use gNB. It must be gNB:TEID.

[PC] Replied in the other thread. TEID is not present. It is a specific SID=
 instance.
Zzh> I also replied there.

> 6. I still don't agree with the aggregation statement in 5.2.3. Per 5.2.2=
 (and see
> #5 above), the gNB does END.DX2/4/6 so per-UE SID (based on N2/4-signaled
> TEID) is needed. Otherwise, gNB needs to forward traffic based on inner
> header (UE address), which is different from both 5.2.2 and normal gNB
> behavior.

[PC] I don't follow your point. You have stated in previous emails that agg=
regation can be done, hence I don't understand which part of the statement =
you disagree with.
"Aggregation can be done for traditional GTP-U, SRv6 transported GTP-U, or =
SRv6 replacing GTP-U."
https://urldefense.com/v3/__https://mailarchive.ietf.org/arch/msg/dmm/Fv98r=
J_PLyg5PNrQdnOa8g-1-EQ/__;!!NEt6yMaO-gk!TtoDf0I3B72KdJ0dz3B-TP46AGXDxJNcJ1L=
Vz5UAFrW--mj0qmI4qbK0gdw9oFfR$

zzh> Let's look at the text here:

   The Enhanced Mode improves since it allows the aggregation of several
   UEs under the same SID list.  For example, in the case of stationary
   residential meters that are connected to the same cell, all such
   devices can share the same SID list.  This improves scalability
   compared to Traditional Mode (unique SID per UE) and compared to
   GTP-U (dedicated TEID per UE).

Zzh> Unless gNB does inner (UE) address lookup to forward traffic, you have=
 to use unique SID per UE. This means that, the aggregation is *not provide=
d by SRv6-replacing-GTP". It is provided by upgraded gNB function (that is =
not 3GPP-defined) that does inner address lookup and completely independent=
 of SRv6.
Zzh> If the "improved scalability" refers to that a single SID is used to r=
each many UEs, then GTP-U (legacy or SRv6-transported) already has that fro=
m day-one (only the gNB address is used).
Zzh> I do agree that when gNB does inner address lookup for forwarding, the=
n aggregation is achieved compared to traditional mode in 5.1. That's also =
why I suggested from early on that the main distinction of enhanced mode is=
 this aggregation (not the traffic steering and service programming). But t=
he spec should be explicit that this is done by inner address lookup. Howev=
er, with aggregation then section 5.2.2 is incorrect because it talks about=
 End.DX2/4/6 with gNB address - how can you do End.DX2/4/6 without per-UE S=
IDs?

> 7. (this is new) 5.2.2 says " gNB's  control plane associates that sessio=
n from the
> UE(A) with the IPv6 address B.  gNB's control plane does a lookup on B to=
 find
> the related SID list <S1, C1, U2::1> ... When the packet arrives at UPF2,=
 the
> active segment (U2::1) is an End.DT4/End.DT6/End.DT2U". End.DT4/6/2U
> requires specific tables for lookup (to go to different DNs in this case)=
 and the
> text is not clear on how that table is determined. Different UEs could be
> associated with different DNs but the N2 signaling can give the same IPv6
> address B. In GTP-U case, the UPF is able to associate different UEs to d=
ifferent
> DNs based on TEID but for SRv6 different mechanism is needed (and missing
> for now). It could be that the control plane will give out different addr=
ess B for
> different DNs but that needs to be spelled out.

Zzh> What about this one?

>
> There may be other minor points/nits. For example, 5.1 says N2/N4 is
> unchanged while 5.2 only says N2 is unchanged. Does 5.2 imply/need N4
> change? Good to be explicit.

[PC] Control-plane is out of the scope of this document.

Zzh> Like in 5.1 saying that N2/N4 is unchanged, 5.2 should be explicit if =
N4 is changed.
Zzh> Details of changes can be out of scope of this document, but a) there =
must be a referenced document talking about it; b) it's good to talk about =
the changes at high level (e.g., different addresses B is given out) in thi=
s document.

>
> BTW - while trying to confirm whether N4 needs to be changed for 5.2, I
> noticed the following in section 9:
>
>    The control plane could be the current 3GPP-defined control plane
>    with slight modifications to the N4 interface [TS.29244].
>
> It should be clarified what kind of modifications to the N4 is needed and=
 for
> what scenario.

[PC] Control-plane is out of the scope of this document. Section 9 provides=
 some considerations, and refers to some technologies that could be used. I=
 don't think any further text should be added -quite the contrary, we shoul=
d remove-.
Zzh> If a solution relies on changed control plane, the changes must be tal=
ked somewhere. If it is not in this document, then a reference should be pr=
ovided.
Zzh> Jeffrey

>
> Jeffrey
>
> -----Original Message-----
> From: dmm <dmm-bounces@ietf.org> On Behalf Of Sri Gundavelli (sgundave)
> Sent: Wednesday, July 7, 2021 2:59 PM
> To: Pablo Camarillo (pcamaril) <pcamaril=3D40cisco.com@dmarc.ietf.org>
> Cc: dmm@ietf.org
> Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-
> mobile-uplane-13
>
> [External Email. Be cautious of content]
>
>
> Authors:
>
> Can you please summarize the discussions and identify the open issues, or
> areas of non-agreement that have come up as part of this WGCLC
>
> Thanks
> Sri
>
>
>
> _______________________________________________
> dmm mailing list
> dmm@ietf.org
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>
> Juniper Business Use Only
>
> Juniper Business Use Only

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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang=40juniper.net@dmarc.ietf.org>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Date: Thu, 22 Jul 2021 17:25:19 +0000
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Date: Thu, 22 Jul 2021 17:25:34 +0000
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang=40juniper.net@dmarc.ietf.org>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dmm/6RC51m81GY0HT3-YuZi-qcI2gYw>
Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Hi Jeffrey,=20

Inline with PC2.

Thanks,
Pablo.

-----Original Message-----
From: dmm <dmm-bounces@ietf.org> On Behalf Of Jeffrey (Zhaohui) Zhang
Sent: jueves, 22 de julio de 2021 16:36
To: Pablo Camarillo (pcamaril) <pcamaril=3D40cisco.com@dmarc.ietf.org>
Cc: dmm@ietf.org
Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mob=
ile-uplane-13

Hi Pablo,

Please see zzh> below.

-----Original Message-----
From: Pablo Camarillo (pcamaril) <pcamaril=3D40cisco.com@dmarc.ietf.org>
Sent: Wednesday, July 21, 2021 1:37 PM
To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
Cc: Sri Gundavelli (sgundave) <sgundave@cisco.com>; dmm@ietf.org
Subject: RE: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mob=
ile-uplane-13

[External Email. Be cautious of content]


Hi Jeffrey,

Many thanks for the summary of the open items.
See inline with [PC].

Cheers,
Pablo.

> -----Original Message-----
> From: Jeffrey (Zhaohui) Zhang <zzhang=3D40juniper.net@dmarc.ietf.org>
> Sent: mi=E9rcoles, 14 de julio de 2021 21:56
> To: Sri Gundavelli (sgundave) <sgundave@cisco.com>; Pablo Camarillo
> (pcamaril) <pcamaril@cisco.com>
> Cc: dmm@ietf.org
> Subject: RE: [DMM] Additional questions/comments on=20
> draft-ietf-dmm-srv6-
> mobile-uplane-13
>
> Hi,
>
> Here is my summary.
>
> General comments:
>
> 1. There were some architecture discussions about=20
> SRv6-transporting-GTPu vs SRv6-replacing-GTPu. I understand that this=20
> document is about SRv6-replacing- GTPu and the other is out of scope. Tha=
t's ok - but the draft should omit "3.
> Motivation" and just have an informational reference to=20
> draft-kohno-dmm- srv6mob-arch. In other words, defer the motivation=20
> discussion to the separate draft and just focus on technical details=20
> in this spec. BTW - I want to clarify here that when I said "the only=20
> advantage of SRv6-replacing-GTPu is MTU savings" is *in comparison* to SR=
v6-transporting-GTPu.

[PC] I have mixed feelings about removing the Section 3(Motivation).
[PC] Stating a couple of paragraphs of motivation is useful to the reader, =
while -if they want details- then they could jump to the draft-kohno for th=
e specifics.
[PC] That said, I also see the point that a Standards Track document should=
 only focus on the technical details and do not discuss such things.
[PC] I'm fine either way (remove or keep). I don't have any preference. I'm=
 the document editor: I'll edit the document to whatever the WG prefers.

> 2. I don't think it is good to categorize into "traditional mode" and=20
> "enhanced mode" (note that I am not saying that an operator does not=20
> have a choice in what it wants to deploy - it's just that the=20
> categorization itself is strange), though that's not technically critical=
.

[PC] As the I-D states
"   The traditional mode minimizes the changes required to the mobile
   system; hence it is a good starting point for forming a common
   ground."
[PC] Since 2017 the wg guidance/consensus was to have these two modes for t=
hat reason above.

> 3. draft-murakami-dmm-user-plane-message-encoding should be a=20
> normative reference.

[PC] I believe it's fine as an informative reference. One could implement t=
his draft without draft-murakami. (While I agree with you that it will be c=
ommon to implement both)

Zzh> Let me take one step back.
Zzh> This spec includes an option where SRv6 encapsulation/decapsulation ba=
sed on N2/N4-signaled GTP-U parameters,=20
so I thought there must be a spec about how the GTP-U header fields are enc=
oded in SRv6. If draft-murakami is that draft, then it must be a normative =
reference. If draft-murakami is not that draft, then either all details nee=
d to be spelled out in this document, or some other document should be refe=
renced (normatively).
Zzh> It seems that you're saying draft-murakmi is a separate/parallel thing=
. If so, which spec talks about how the GTP extension headers, sequence num=
ber, N-PDU number are encoded? If those are not expected to be used/support=
ed, it needs to be pointed out.
[PC2] None of those additional GTP-U parameters are included in the SRv6 en=
capsulation defined in this document. The N2/N4-signaled GTP-U parameters a=
re combined with a local policy to steer on a SID list. If you want to enco=
de the additional parameters, then this is out of the scope of this documen=
t. Informative reference to draft-murakami provides one possible encoding.=
=20

+       0-2     3       4       5       6       7       8-15    16-23   24-=
31
0       Version Protocol type   Reserved        Extension Header Flag   Seq=
uence Number Flag    N-PDU Number Flag       Message Type    Message length
32      TEID
64      Sequence number N-PDU number    Next extension header type

>
> Specific outstanding technical comments:
>
> 4. In 5.3, for uplink traffic, the GW has End.M.GTP6.D for the UPF=20
> address B and the gNB does not need to know the existence of GW. For=20
> downlink traffic, the UPF knows there is a GW and put the GW::TEID in=20
> the SRH. Why not make GW invisible to UPF as well and just use=20
> gNB::TEID, and then have gNB/96 as End.M.GTP6.E on the SRGW? You can=20
> still put GW in the SRH to steer traffic through the GW.

[PC] Replied in the other thread.
Zzh> I did not see it there?
[PC2] I got confused to the other point. Indeed it wasn't replied.
[PC2] The address B in the uplink is a BindingSID at the SRGW. It is not a =
SID belonging to the UPF as you state in your first sentence.

> 5. In 5.2.2, because of the END.DX2/4/6 behavior on gNB, the SID list=20
> and S1_out can't just simply use gNB. It must be gNB:TEID.

[PC] Replied in the other thread. TEID is not present. It is a specific SID=
 instance.
Zzh> I also replied there.

> 6. I still don't agree with the aggregation statement in 5.2.3. Per=20
> 5.2.2 (and see
> #5 above), the gNB does END.DX2/4/6 so per-UE SID (based on=20
> N2/4-signaled
> TEID) is needed. Otherwise, gNB needs to forward traffic based on=20
> inner header (UE address), which is different from both 5.2.2 and=20
> normal gNB behavior.

[PC] I don't follow your point. You have stated in previous emails that agg=
regation can be done, hence I don't understand which part of the statement =
you disagree with.
"Aggregation can be done for traditional GTP-U, SRv6 transported GTP-U, or =
SRv6 replacing GTP-U."
https://urldefense.com/v3/__https://mailarchive.ietf.org/arch/msg/dmm/Fv98r=
J_PLyg5PNrQdnOa8g-1-EQ/__;!!NEt6yMaO-gk!TtoDf0I3B72KdJ0dz3B-TP46AGXDxJNcJ1L=
Vz5UAFrW--mj0qmI4qbK0gdw9oFfR$

zzh> Let's look at the text here:

   The Enhanced Mode improves since it allows the aggregation of several
   UEs under the same SID list.  For example, in the case of stationary
   residential meters that are connected to the same cell, all such
   devices can share the same SID list.  This improves scalability
   compared to Traditional Mode (unique SID per UE) and compared to
   GTP-U (dedicated TEID per UE).

Zzh> Unless gNB does inner (UE) address lookup to forward traffic, you have=
 to use unique SID per UE. This means that, the aggregation is *not provide=
d by SRv6-replacing-GTP". It is provided by upgraded gNB function (that is =
not 3GPP-defined) that does inner address lookup and completely independent=
 of SRv6.
Zzh> If the "improved scalability" refers to that a single SID is used to r=
each many UEs, then GTP-U (legacy or SRv6-transported) already has that fro=
m day-one (only the gNB address is used).
Zzh> I do agree that when gNB does inner address lookup for forwarding, the=
n aggregation is achieved compared to traditional mode in 5.1. That's also =
why I suggested from early on that the main distinction of enhanced mode is=
 this aggregation (not the traffic steering and service programming). But t=
he spec should be explicit that this is done by inner address lookup. Howev=
er, with aggregation then section 5.2.2 is incorrect because it talks about=
 End.DX2/4/6 with gNB address - how can you do End.DX2/4/6 without per-UE S=
IDs?

[PC2] GTP-U today does not allow to perform aggregation. Please point me to=
 the relevant 3GPP standard if I'm wrong.
[PC2] You may have aggregation on the uplink and on the downlink. I believe=
 your point is particularly on the downlink (as you have already recognized=
 uplink is doable).
[PC2] You have various methods or forms to perform the downlink aggregation=
.
[PC2] One of them is to do an inner address lookup. In such case you are in=
deed right that instead of using End.DX2/DX4/DX6, the DT4/DT6/DT2 should be=
 used.
[PC2] Another option is to forward to the group of UEs and let the UE drop =
the packet based on the IP destination address.

> 7. (this is new) 5.2.2 says " gNB's  control plane associates that=20
> session from the
> UE(A) with the IPv6 address B.  gNB's control plane does a lookup on B=20
> to find the related SID list <S1, C1, U2::1> ... When the packet=20
> arrives at UPF2, the active segment (U2::1) is an=20
> End.DT4/End.DT6/End.DT2U". End.DT4/6/2U requires specific tables for=20
> lookup (to go to different DNs in this case) and the text is not clear=20
> on how that table is determined. Different UEs could be associated=20
> with different DNs but the N2 signaling can give the same IPv6 address=20
> B. In GTP-U case, the UPF is able to associate different UEs to=20
> different DNs based on TEID but for SRv6 different mechanism is needed=20
> (and missing for now). It could be that the control plane will give out d=
ifferent address B for different DNs but that needs to be spelled out.

Zzh> What about this one?
[PC2] You are right, the control plane needs to ensure consistency when doi=
ng SID advertisements. That said, I don't see why such control plane consid=
eration should be added to this document given that this document focuses o=
n the dataplane and control plane is out of the scope of this document.

>
> There may be other minor points/nits. For example, 5.1 says N2/N4 is=20
> unchanged while 5.2 only says N2 is unchanged. Does 5.2 imply/need N4=20
> change? Good to be explicit.

[PC] Control-plane is out of the scope of this document.

Zzh> Like in 5.1 saying that N2/N4 is unchanged, 5.2 should be explicit if =
N4 is changed.
Zzh> Details of changes can be out of scope of this document, but a) there =
must be a referenced document talking about it; b) it's good to talk about =
the changes at high level (e.g., different addresses B is given out) in thi=
s document.

[PC2] It is already stated in 5.2 (fourth paragraph). Text only talks about=
 N2. I will add N4.

>
> BTW - while trying to confirm whether N4 needs to be changed for 5.2,=20
> I noticed the following in section 9:
>
>    The control plane could be the current 3GPP-defined control plane
>    with slight modifications to the N4 interface [TS.29244].
>
> It should be clarified what kind of modifications to the N4 is needed=20
> and for what scenario.

[PC] Control-plane is out of the scope of this document. Section 9 provides=
 some considerations, and refers to some technologies that could be used. I=
 don't think any further text should be added -quite the contrary, we shoul=
d remove-.
Zzh> If a solution relies on changed control plane, the changes must be tal=
ked somewhere. If it is not in this document, then a reference should be pr=
ovided.
[PC2] I will replace the entire section 9 by the following:
<OLD>
9.  Control Plane Considerations

   This document focuses on user-plane behavior and its independence
   from the control plane.

   The control plane could be the current 3GPP-defined control plane
   with slight modifications to the N4 interface [TS.29244].

   Alternatively, SRv6 could be used in conjunction with a new mobility
   control plane as described in LISP [I-D.rodrigueznatal-lisp-srv6],
   hICN [I-D.auge-dmm-hicn-mobility-deployment-options] or in
   conjunction with FPC [I-D.ietf-dmm-fpc-cpdp].  The analysis of new
   mobility control-planes and its applicability to an SRv6 user-plane
   is out of the scope of this document.

   Section 11 allocates SRv6 Segment Endpoint Behavior codepoints for
   the new behaviors defined in this document.
</OLD>
<NEW>
9.  Control Plane Considerations

   This document focuses on user-plane behavior and its independence
   from the control plane. While there are benefits in an enhanced control =
plane, this document does not impose any change to it.

   Section 11 allocates SRv6 Segment Endpoint Behavior codepoints for
   the new behaviors defined in this document to be used by a control plane=
 if needed.=20
</NEW>=20
Zzh> Jeffrey

>
> Jeffrey
>
> -----Original Message-----
> From: dmm <dmm-bounces@ietf.org> On Behalf Of Sri Gundavelli=20
> (sgundave)
> Sent: Wednesday, July 7, 2021 2:59 PM
> To: Pablo Camarillo (pcamaril) <pcamaril=3D40cisco.com@dmarc.ietf.org>
> Cc: dmm@ietf.org
> Subject: Re: [DMM] Additional questions/comments on=20
> draft-ietf-dmm-srv6-
> mobile-uplane-13
>
> [External Email. Be cautious of content]
>
>
> Authors:
>
> Can you please summarize the discussions and identify the open issues,=20
> or areas of non-agreement that have come up as part of this WGCLC
>
> Thanks
> Sri
>
>
>
> _______________________________________________
> dmm mailing list
> dmm@ietf.org
> https://urldefense.com/v3/__https://www.ietf.org/mailman/listinfo/dmm__;!
> !NEt6yMaO-gk!RHnpE1MQpMxwvVzdJxpCZjAUFz5bvXIR6cIWkZ21QDqH-
> Jv91pT-qaf5U6u-eMJx$
>
> Juniper Business Use Only
>
> Juniper Business Use Only

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From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
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If providing behavioral building blocks is your intention, then in my 
opinion you need to

1) Go through and edit the document to remove all the places where you 
change 3GPP defined nodal operation / behavior.

2) Focus on the Srv6 endpoint behaviors, and take it to SPRING to define 
those, rather than focusing on the mobile system behavior.

Given the sheer number of behaviors that have been defined with minimal 
explanation of why all the different variations are needed, I doubt that 
getting a few more would be a problem.

As currently written, the draft does things that do not align with the 
purpose you describe below.

Yours,
Joel

On 7/22/2021 1:25 PM, Pablo Camarillo (pcamaril) wrote:
> Joel,
> 
> What this draft is doing is defining the building blocks for a mobility architecture with SRv6. The building blocks are the new SRv6 behaviors for the dataplane.
> IETF is providing the tool. If 3GPP wishes to adopt it in their specifications, it is up to them to do it. But this document does not change any 3GPP architecture.
> 
> Cheers,
> Pablo.
> 
> -----Original Message-----
> From: Joel M. Halpern <jmh@joelhalpern.com>
> Sent: miércoles, 21 de julio de 2021 19:40
> To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
> Cc: dmm@ietf.org
> Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
> 
> You asserted that certain needs can not be met without the changes to the 3GPP architecture this draft calls for.
> 
> Clearly, 3GPP does not agree as they have declined to make the changes you are asking for.
> 
> Equally, the IETF appears not to agree, as we have some approaches that appear to work without these changes, and are developing others.  (I admit this is an individual judgment, but then so is the problem kohno draft you are pointing at.)
> 
> More importantly, the IETF has no business changing the 3GPP architecture.  We object (have in the past, and expect would in the
> future) when people change IETF architecturse externally to the IETF.
> We owe other SDOs the same respect.
> 
> Yours,
> Joel
> 
> On 7/21/2021 1:34 PM, Pablo Camarillo (pcamaril) wrote:
>> Hi Joel,
>>
>> I believe the TEAS slicing framework is orthogonal and complementary to this. This draft, and many other technologies around IETF, will benefit from the slicing framework of TEAS.
>> Nonetheless, the text below is one of the key motivations, but not the
>> only one. More details on the other key points in here:
>> draft-kohno-dmm-srv6mob-arch-04
>>
>> Many thanks,
>> Pablo.
>>
>> -----Original Message-----
>> From: Joel M. Halpern <jmh@joelhalpern.com>
>> Sent: miércoles, 16 de junio de 2021 0:03
>> To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
>> Cc: dmm@ietf.org
>> Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>
>> Actually, assuming that the IETF TEAS network slicing definitions / framework and follow-on work is successful, it should be quite possible to deliver appropriate services (network sliced service based on IETF network slices) to 3GPPP GTP encapsulated 5G traffic while using the GTP-U encapsulation.  SRv6 is likely to be one of several transport mechanisms available to do so.
>>
>> So if the inability to do so is the premise of your document, it appears to me that there is no need for the document.
>>
>> Yours,
>> Joel
>>
>> PS: In fact, it is pretty clear that the needed services can be delivered even now in conjunction with GTP.  The TEAS work will make managing and coordinating that delivery interoperably easier.
>>
>> On 6/15/2021 3:01 PM, Pablo Camarillo (pcamaril) wrote:
>>> Hi Jeffrey,
>>>
>>> I've already provided one of the key motivations in my previous email. There is an operational challenge in the current mobility networks: there are no means to have a fine-granular SLA across both the mobile and the transport network. SRv6 is bridging this gap by integrating the underlay and the overlay control from the source node (either the gNB or the UPF).
>>> I am not aware of any standardized solution that solves this problem.
>>> Therefore, I disagree on your statement "the only benefit of SRv6-replacing-GTP-U is the MTU saving between SRv6 tunnel endpoints".
>>>
>>> Cheers,
>>> Pablo.
>>>
>>> -----Original Message-----
>>> From: Jeffrey (Zhaohui) Zhang <zzhang=40juniper.net@dmarc.ietf.org>
>>> Sent: lunes, 14 de junio de 2021 22:19
>>> To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
>>> Cc: dmm@ietf.org
>>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> Hi Pablo,
>>>
>>> As you have alluded to, we're not converging but that's ok.
>>>
>>> My point is not to write a draft about SRv6-transported-GTP-U (there is no need for such draft, just like we don't need another draft about "transporting foo" with SRv6). My point is that the only benefit of SRv6-replacing-GTP-U is the MTU saving between SRv6 tunnel endpoints.
>>>
>>> There are other details that need to be taken care of in the draft, which we have been discussing.
>>>
>>> Jeffrey
>>>
>>> -----Original Message-----
>>> From: Pablo Camarillo (pcamaril)
>>> <pcamaril=40cisco.com@dmarc.ietf.org>
>>> Sent: Monday, June 14, 2021 3:47 PM
>>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>>> Cc: dmm@ietf.org
>>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> [External Email. Be cautious of content]
>>>
>>>
>>> Hi Jeffrey,
>>>
>>> Inline with [PC6]. Many thanks for your explicit answers.
>>>
>>> Cheers,
>>> Pablo.
>>>
>>> -----Original Message-----
>>> From: Jeffrey (Zhaohui) Zhang <zzhang=40juniper.net@dmarc.ietf.org>
>>> Sent: lunes, 14 de junio de 2021 21:01
>>> To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
>>> Cc: dmm@ietf.org
>>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> Hi Pablo,
>>>
>>> Let me also copy (zzh2>, zzh3>) and explicitly add (zzh4>) my answers below.
>>>
>>> -----Original Message-----
>>> From: Pablo Camarillo (pcamaril)
>>> <pcamaril=40cisco.com@dmarc.ietf.org>
>>> Sent: Monday, June 14, 2021 2:22 PM
>>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>>> Cc: dmm@ietf.org
>>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> [External Email. Be cautious of content]
>>>
>>>
>>> Jeffrey,
>>> Inline with [PC5].
>>> Cheers,
>>> Pablo.
>>>
>>> -----Original Message-----
>>> From: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>>> Sent: lunes, 14 de junio de 2021 19:32
>>> To: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>;
>>> Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
>>> Cc: dmm@ietf.org
>>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> Hi Pablo,
>>>
>>> If we look at the my original points:
>>> [PC5] Jeffrey, I believe both of your points have been answered. I've copied the relevant answers for your reference here below with PC, PC2 and PC4. Answer does not differ. If any clarification is needed on my previous answers, please let me know. Thanks.
>>>
>>> -------
>>> 1. Since GTP-U can be transported over SRv6, which can also make use of TE capability and used for service programing (NFS chaining), the only real difference between SRv6 tunnel and GTP-U tunnel is that the UDP/GTP-U header is no longer needed in the SRv6 tunnel case (in particular, the GTP-U TEID becomes part of the IPv6 address). With that, most of " 3.  Motivation" are not really applicable.
>>> [PC] The integration of the overlay with the underlay SLA and service chaining cannot be achieved with GTP-U.
>>> [PC2] As documented in 5.2, the SID list imposed by the source node includes segments for traffic engineering, NFV, and the overlay creation -all within the context of one network slice-. All the intermediate nodes in the fabric are stateless, hence you achieve highly scalable SLA.
>>> [PC2] With an SRv6 transported GTP-U, the gNB only inserts the GTP-U header. Then the cell site router needs to do a mapping of GTP-U sessions to SLA policies. This implies that you need some mapping mechanism at the Cell Site Router, that needs to have state. The gNB will not have any control of the underlay path, ...
>>>
>>> Zzh2> For SRv6-transported GTP-U, why can't the gNB itself put on the appropriate SRH like in the SRv6-replacing-GTP-U case?
>>> Zzh2> As quoted/discussed later, even in SRv6-replacing-GTU-U case, the gNB does not get the SRv6 information from the AMF:
>>>       The gNB MAY resolve the IP address received via the control plane
>>>       into a SID list using a mechanism like PCEP, DNS-lookup, LISP
>>>       control-plane or others.  The resolution mechanism is out of the
>>>       scope of this document.
>>> Zzh2> With that, even if you have a separate device to do the mapping, why can't that device do the same?
>>> Zzh2> In other words, I still don’t see difference wrt SLA between SRv6-transported-GTP-U and SRv6-replacing-GTP-U.
>>> [PC3] If the gNB also adds the SRH as you suggest, then you are changing the N3/N9 interface as well.
>>>
>>> Zzh3> Wouldn't it be the other way around - SRv6-replacing-GTP-U is "changing the N3/N9 interface"? SRv6-transported-GTU-U is still the same N3/N9 interface, just that now they have SRH for traffic steering purpose.
>>> [PC4] SRv6-replacing-GTP-U is a change in the N3/N9 interface.
>>>
>>> Zzh4> I said in zzh2> that with SRv6-transported-GTP-U, gNB could also add traffic steering via SRH - no different from SRv6-replacing-GTP-U. You said that's changing N3/N9, and I replied in zzh3> SRv6-replacing-GTP-U is changing the N3/N9, which you confirmed in [PC4]. Therefore, you have not really countered zzh2> above.
>>> [PC6] There are no means to have fine-grained mapping of transport SLA with the mobility SLA.
>>> [PC6] Any transport protocol that encapsulates the gNB packet in the cell site router cannot achieve fine-grained SLA due to scaling limitations and control plane complexity.
>>> [PC6] One option to solve this problem is to use SRv6 as a replacement to GTP-U, whereas the gNB encodes the SLA in the packet. This is what this draft is about.
>>> [PC6] Certainly you write a new I-D to define a new N3/N9 interfaces that bundle together the overlay and underlay protocols (e.g. the gNB pushes the GTP-U header together with the MPLS label stack of the transport). I don't see the benefits of such approach, and this draft is not proposing anything close to it.
>>>
>>> -------
>>> Aggregation can be done for traditional GTP-U, SRv6 transported GTP-U, or SRv6 replacing GTP-U.
>>> [PC4] I'm not aware that 29.281 allows aggregating N3/N9 traffic from different TEIDs into the same TEID -despite from any local policy-. That said, this I-D is not proposing a change in GTPU. Hence, any discussion on GTPU aggregation or change to allow it in GTP-U is out of the scope of this draft.
>>> -------
>>> Zzh4> It's not clear why you would refer to 29.281 - since it certainly does not talk about SRv6 either. Local policy means it's local behavior based on unchanged N2/N4 - if you play SRv6 tricks for aggregation one can certainly play other tricks for GTP-U based on local policy. I understand that aggregation in GTP-U (via local policy) is outside the scope of this draft and I am not suggesting to add that - my point is only that the aggregation benefit is not only enabled by or exclusive to SRv6.
>>> [PC6] I completely agree with you. Aggregation can be achieved with GTP-U. It needs to be modified first though, as 29.281 -or any other 3GPP spec- does not seem to allow it; while in the case of SRv6 we are writing an I-D that explicitly allows it.
>>> [PC6] Please let me know if there is any action item with respect to this comment on this I-D. As said, GTP-U aggregation is out of the scope of the document.
>>> Zzh4> In summary, the benefit of SRv6-replacing-GTP-U is really just the MTU saving between the SRv6 endpoints, and I have not seen a real counter argument against that.
>>> [PC6] I disagree with this comment for the reasons exposed above.
>>> Zzh4> Jeffrey
>>> [PC6] Please let me know whether there is any extra clarification needed.
>>>
>>> Our exchanges had some clarifications on details, but I don't think the above points have been invalidated.
>>> [PC5] Please let me know whether there is any clarification needed on top of the previous answers.
>>>
>>> Jeffrey
>>>
>>> -----Original Message-----
>>> From: Pablo Camarillo (pcamaril)
>>> <pcamaril=40cisco.com@dmarc.ietf.org>
>>> Sent: Monday, June 14, 2021 1:16 PM
>>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>; Pablo Camarillo
>>> (pcamaril) <pcamaril@cisco.com>
>>> Cc: dmm@ietf.org
>>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> [External Email. Be cautious of content]
>>>
>>>
>>> Hi Jeffrey,
>>> Inline with PC4.
>>> Pablo.
>>>
>>> -----Original Message-----
>>> From: dmm <dmm-bounces@ietf.org> On Behalf Of Jeffrey (Zhaohui) Zhang
>>> Sent: lunes, 14 de junio de 2021 18:00
>>> To: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>
>>> Cc: dmm@ietf.org
>>> Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> Hi Pablo,
>>>
>>> Please see zzh3> below. I don't agree with the two [PC3] points.
>>>
>>> -----Original Message-----
>>> From: Pablo Camarillo (pcamaril)
>>> <pcamaril=40cisco.com@dmarc.ietf.org>
>>> Sent: Friday, June 11, 2021 10:17 AM
>>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>>> Cc: dmm@ietf.org
>>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> [External Email. Be cautious of content]
>>>
>>>
>>> Hi Jeffrey,
>>>
>>> Inline with [PC3].
>>>
>>> Thanks,
>>> Pablo.
>>>
>>> -----Original Message-----
>>> From: dmm <dmm-bounces@ietf.org> On Behalf Of Jeffrey (Zhaohui) Zhang
>>> Sent: lunes, 7 de junio de 2021 15:58
>>> To: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>
>>> Cc: dmm@ietf.org
>>> Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> Hi Pablo,
>>>
>>> Please see zzh2> below.
>>>
>>> -----Original Message-----
>>> From: Pablo Camarillo (pcamaril)
>>> <pcamaril=40cisco.com@dmarc.ietf.org>
>>> Sent: Friday, June 4, 2021 12:53 PM
>>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>>> Cc: dmm@ietf.org
>>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> [External Email. Be cautious of content]
>>>
>>>
>>> Inline with PC2.
>>> Many thanks and have a good weekend.
>>>
>>> -----Original Message-----
>>> From: Jeffrey (Zhaohui) Zhang <zzhang=40juniper.net@dmarc.ietf.org>
>>> Sent: martes, 1 de junio de 2021 16:46
>>> To: Pablo Camarillo (pcamaril) <pcamaril@cisco.com>
>>> Cc: dmm@ietf.org
>>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> Hi Pablo,
>>>
>>> Please see zzh> below.
>>>
>>> -----Original Message-----
>>> From: Pablo Camarillo (pcamaril)
>>> <pcamaril=40cisco.com@dmarc.ietf.org>
>>> Sent: Tuesday, June 1, 2021 7:23 AM
>>> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>>> Cc: dmm@ietf.org
>>> Subject: RE: Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> [External Email. Be cautious of content]
>>>
>>>
>>> Hi Jeffrey,
>>>
>>> Thanks for the reviews. Answers inline with [PC].
>>>
>>> Thanks,
>>> Pablo.
>>>
>>> -----Original Message-----
>>> From: dmm <dmm-bounces@ietf.org> On Behalf Of Jeffrey (Zhaohui) Zhang
>>> Sent: martes, 1 de junio de 2021 4:33
>>> To: Pablo Camarillo (pcamaril) <pcamaril=40cisco.com@dmarc.ietf.org>;
>>> dmm@ietf.org
>>> Subject: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
>>>
>>> After many email exchanges and seeing two revisions (-12, -13), I now have a much better understanding of the draft. Here my further observations/understanding/comments.
>>>
>>> Observations/Understanding:
>>>
>>> A. This does *not* require *any* changes in the N2/N4 signaling. AMF/SMF/gNB/UPF will still use existing signaling based on GTP-U, but gNB/UPF will use either SRv6 or GTP-U tunnels based on local policy.
>>> B. If both ends (gNB/UPF) of a tunnel use SRv6, no interworking is needed, and two modes (traditional/enhanced) are defined. This is in section 5.1 and 5.2 respectively.
>>> C. If gNB does not use SRv6 but UPF does, an SRGW is placed next to the gNB. This is covered in 5.3 using enhanced mode example, but can be applied to traditional mode as well.
>>> D. If neither gNB nor UPF uses SRv6, GTP-U tunnels could still be changed to SRv6 between two GWs - another SRGW is placed next to the UPF as well. This is covered in 5.4 and referred to as drop-in mode.
>>>
>>> [PC] All the observations look good, with a side note on A: Future documents may define a new signaling.
>>>
>>> Comments:
>>>
>>> 1. Since GTP-U can be transported over SRv6, which can also make use of TE capability and used for service programing (NFS chaining), the only real difference between SRv6 tunnel and GTP-U tunnel is that the UDP/GTP-U header is no longer needed in the SRv6 tunnel case (in particular, the GTP-U TEID becomes part of the IPv6 address). With that, most of " 3.  Motivation" are not really applicable.
>>> [PC] The integration of the overlay with the underlay SLA and service chaining cannot be achieved with GTP-U.
>>>
>>> Zzh> Can you elaborate how they're achieved w/ SRv6 replacing GTP-U and not achieved with SRv6 transported GTP-U?
>>> [PC2] As documented in 5.2, the SID list imposed by the source node includes segments for traffic engineering, NFV, and the overlay creation -all within the context of one network slice-. All the intermediate nodes in the fabric are stateless, hence you achieve highly scalable SLA.
>>> [PC2] With an SRv6 transported GTP-U, the gNB only inserts the GTP-U header. Then the cell site router needs to do a mapping of GTP-U sessions to SLA policies. This implies that you need some mapping mechanism at the Cell Site Router, that needs to have state. The gNB will not have any control of the underlay path, ...
>>> Zzh2> For SRv6-transported GTP-U, why can't the gNB itself put on the appropriate SRH like in the SRv6-replacing-GTP-U case?
>>> Zzh2> As quoted/discussed later, even in SRv6-replacing-GTU-U case, the gNB does not get the SRv6 information from the AMF:
>>>       The gNB MAY resolve the IP address received via the control plane
>>>       into a SID list using a mechanism like PCEP, DNS-lookup, LISP
>>>       control-plane or others.  The resolution mechanism is out of the
>>>       scope of this document.
>>> Zzh2> With that, even if you have a separate device to do the mapping, why can't that device do the same?
>>> Zzh2> In other words, I still don’t see difference wrt SLA between SRv6-transported-GTP-U and SRv6-replacing-GTP-U.
>>> [PC3] If the gNB also adds the SRH as you suggest, then you are changing the N3/N9 interface as well.
>>>
>>> Zzh3> Wouldn't it be the other way around - SRv6-replacing-GTP-U is "changing the N3/N9 interface"? SRv6-transported-GTU-U is still the same N3/N9 interface, just that now they have SRH for traffic steering purpose.
>>> [PC4] SRv6-replacing-GTP-U is a change in the N3/N9 interface.
>>> [PC4] SRv6-transported-GTP-U, if SRv6 is starting at the gNB and terminating at the UPF, to me it is also a change in N3/N9.
>>> [PC4] SRv6-transported-GTP-U, if SRv6 is the transport starting at the cell site router, to me this is NOT a change in N3/N9.
>>>
>>> [PC2] By the way, the limitations of SRv6 transported GTP-U are also present in the Drop-in mode of this document.
>>>
>>> [PC] Actually you have a lot more of motivation in this document:
>>> draft-kohno-dmm-srv6mob-arch-04
>>>
>>> Zzh> I had similar comments in that thread.
>>>
>>> 2. Besides the TEID, there are other parameters in the GTP-U header. How those are represented in the SRv6 header needs to be defined.
>>> [PC] draft-murakami-dmm-user-plane-message-encoding-03
>>>
>>> Zzh> That should be a normative reference then.
>>> [PC2] I don't think any of those is required to implement the I-D. I could foresee an operator that is interested on this ID to also be interested on that one, but I don’t think this is a reason to add the normative reference..
>>> Zzh2> This document assumes that the 5G NFs will encode/decode SRv6 headers based on signaled GTP-U parameters, or GWs will convert between GTP-U and SRv6 headers. If that does not warrant a normative reference to draft-murakami, I am not sure what normative references are for. I'll defer this to chairs/ADs/IESG.
>>>
>>> 3. I still think there is no need to define the traditional/enhanced mode (see my reasoning below).
>>> 4. Now it's not clear if the interworking mode (including the drop-in mode) is worth the trouble (see my reasoning at the end).
>>> [PC] Answers to 3 and 4 below.
>>>
>>> Let me expand on #3 above.
>>>
>>> "5.1.  Traditional mode" focuses on the one-to-one mapping among (PDU session, GTP-U tunnel, SRv6 tunnel) and casually mentions "SID list only contains a single SID".
>>> " 5.2.  Enhanced Mode" talks about two things: SID list for TE and service programing/chaining, and scalability improvement via aggregation.
>>>
>>> 5.2 says:
>>>
>>>       The gNB MAY resolve the IP address received via the control plane
>>>       into a SID list using a mechanism like PCEP, DNS-lookup, LISP
>>>       control-plane or others.  The resolution mechanism is out of the
>>>       scope of this document.
>>>
>>> That means the use of SID list for TE and service programming is not per the mobile architecture, but purely per operator's choice [PC] Indeed. The operator is the one that decides whether traffic needs a particular SLA. As in wireline...
>>> , and it can also be used for both traditional mode and SRv6-transported GTP-U tunnels - really nothing special to be limited to enhanced mode only.
>>> It is true that some gNB may not be able to put on an SRH, but that equipment limitation should not become a criteria - just like that for general SRv6 (outside this mobile user plane context) we don't have "basic" vs. "advanced/enhanced" modes just because some devices cannot insert SRH.
>>> [PC] The motivation behind traditional mode is:
>>> "   The traditional mode minimizes the changes required to the mobile
>>>       system; hence it is a good starting point for forming a common
>>>       ground."
>>>
>>> Zzh> Why did we not have "basic" vs. "advanced/enhanced" modes for SRv6 in wireline networks 😊 There is no change to mobile system/architecture, except the transport network, which is no different from wireline.
>>> [PC2] Fair point. 😉 I understand your opinion, but after three years the working group seemed to prefer the traditional mode. I note your preference.
>>>
>>> Defining traditional/enhanced mode based on aggregation is more reasonable. However, consider the following aspects:
>>>
>>> - Currently only up link traffic can benefit from aggregation, and
>>> that's only when the AMF provides the same <UPF address, TEID> for
>>> multiple PDU sessions
>>> - The same can be done for traditional GTP-U, SRv6 transported GTP-U, or SRv6 replacing GTP-U.
>>> [PC] GTP-U does not allow that. Certainly you could go to 3GPP and change the specs to allow it, but as per today it is not allowed.
>>>
>>> Zzh> We established that there is no change to N2/N4 or mobile architecture: AMF/SMF continue to signal GTP-U parameters like <tunnel endpoint, TEID> but gNB/UPF may use SRv6 replacing GTP-U per local policy. With that, how is uplink aggregation achieved?
>>> [PC2] The local policy indicates to aggregate several bearers into the same SRv6 SID list.
>>> Zzh2> For GTP-U, whether transported by SRv6 or not, traffic is routed based on the UPF/gNB address - that is aggregation already. If finer granularity is needed, similar local policy (to the ones used in SRv6-replacing-GTP-U case) can aggregate smaller subsets of UEs, right?
>>> Zzh2> Basically, I really don't see any difference.
>>> [PC3] As stated above, certainly you change the current GTP-U spec to allow aggregation as proposed in this I-D. However, the current GTP-U standard does not allow it.
>>>
>>> Zzh3> There is no change to GTP-U spec or N2/N4 interface. As stated above, it is the local policy (when finer granularity is needed) that does the aggregation - no different from SRv6-replacing-GTP-U.
>>> [PC4] I'm not aware that 29.281 allows aggregating N3/N9 traffic from different TEIDs into the same TEID -despite from any local policy-. That said, this I-D is not proposing a change in GTPU. Hence, any discussion on GTPU aggregation or change to allow it in GTP-U is out of the scope of this draft.
>>> Zzh3> Jeffrey
>>>
>>> Zzh2> Jeffrey
>>>
>>> Zzh> Thanks.
>>> Zzh> Jeffrey
>>>
>>> The reason the aggregation is not applicable to downlink traffic is because the gNB does not do IP lookup based on inner header.
>>> [PC] Indeed that is one option. That is new compared to today's mobile architecture. I don’t think its complex to implement though. End of the day we've done it for quite some time in wireline. Another option is to forward to a group of UEs and let the UE drop the packet based on the IPV6 DA.
>>> Rather, downlink traffic forwarding on a gNB is purely based on TEID (whether it is in the GTP-U header or in the SRv6 SID). Therefore, the uplink aggregation or downlink aggregation (if gNB starts doing IP lookup based on inner header, which would be a big departure from existing architecture) is really controlled by the mobile architecture, not by the use of SRv6 tunnel. To achieve aggregation, the AMF/SMF will need to signal different GTP-U parameters, even though the signaling format does not need to change.
>>>
>>> As a result, defining traditional/enhanced mode for SRv6 user plane really is not necessary.
>>> [PC] There is a motivation behind each of the modes. Operators find it easier to deploy this way.
>>>
>>> Now let me expand on #4 above.
>>>
>>> There is no real difference between SRv6-transported GTP-U  and SRv6 replacing GTP-U (other than that the latter does not have UDP/GTP-U headers). If both tunnel ends can support SRv6 natively, it's reasonable to use SRv6 tunnels (replacing GTP-U) right at the tunnel ends. But if a gNB has to start/end with GTP-U (with the UDP/GTP-U headers), what is the benefit of converting to/from SRv6 by a GW, which means additional capex/opex? It's an additional failure point - the implementation could have bugs and it could fail for various reasons. It may be better off to only do SRv6 tunneling when both ends can support it. It's not clear to me that the bandwidth saving between the GW and UPF is worth the trouble.
>>> [PC] Well... there are two differences between SRv6-transported GTPU and SRv6 replacing GTP-U. The first and obvious is the removal of the UDP/GTP-U header -which already has huge benefits as the IPv6 Flow Label for entropy 😉-. The second and most interesting difference is that the SRv6 replacement of GTP-U allows the integration of the overlay with the underlay SLA and service chaining. More in draft-kohno-dmm-srv6mob-arch-04.
>>>
>>> These are high level comments. I may have more to come, and I definitely have more text/wording comments to share afterwards.
>>>
>>> Thanks.
>>> Jeffrey
>>>
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From: "Sri Gundavelli (sgundave)" <sgundave@cisco.com>
To: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Subject: Re: [DMM] Comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
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Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang=40juniper.net@dmarc.ietf.org>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Content-Type: text/plain; name="draft-ietf-dmm-srv6-mobile-uplane.txt"
Content-Description: draft-ietf-dmm-srv6-mobile-uplane.txt
Content-Disposition: attachment;
 filename="draft-ietf-dmm-srv6-mobile-uplane.txt"; size=68192;
 creation-date="Fri, 23 Jul 2021 15:41:00 GMT";
 modification-date="Fri, 23 Jul 2021 15:41:00 GMT"
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From: David Allan I <david.i.allan@ericsson.com>
To: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Fri, 23 Jul 2021 12:03:46 -0700
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To: David Allan I <david.i.allan=40ericsson.com@dmarc.ietf.org>
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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--000000000000ce3bb705c7cf10c1
Content-Type: text/plain; charset="UTF-8"

Hi Dave,

Very good list and I am sure there could be a bit more functionalities GTP
overlay  has been supporting over a period of time *and* still currently
being used in various parts of the cellular networks.

Replacing overlays may be a good goal if we can bring the same technical
benefits different underlays (L2, L2.5, IPv4, IPv6) bring to the table in
various parts of the networks, in this case cellular deployments. We(IETF)
should develop tools towards the objective but I suspect we are there to
replace any overlay (if this is the central goal) with a single underlay
mechanism. Dino presented multiple times on this topic in various
WGs/pre-bofs/BoFs and also asked to "get over with it" (a thin overlay).

One of the things that we all should ask ourselves is - what overlay
functionalities we want to bring to underlay (L3/L2.5) as opposed to
complete replacement of the overlay. IMO, this is a better question than
"replacing".

Appreciate your thoughts and views on this.

Thank you!
--
Uma C.



On Fri, Jul 23, 2021 at 10:50 AM David Allan I <david.i.allan=
40ericsson.com@dmarc.ietf.org> wrote:

> Hi:
>
> Looking over this draft it strikes me that IF you are discussing a GTP
> replacement, there are a few unaddressed gaps...or at least I see no
> mention of them.
>
> -  adding X2 to the list of interfaces to be supported
> -  support for end-marker for handoff stream synchronization (probably
> could fit the unused bit in Args.Mob.Session but frankly I have not studied
> this in detail)
> -  support for QMP (quality measurement protocol), which I believe needs
> to also extend across the radio interface so is not simply local to the GTP
> domain and can be "stunt doubled"
> -  support for paging policy presence/indication
>
> If this has come up elsewhere, let me know
>
> Cheers
> Dave
>
>
> _______________________________________________
> dmm mailing list
> dmm@ietf.org
> https://www.ietf.org/mailman/listinfo/dmm
>

--000000000000ce3bb705c7cf10c1
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Dave,<div><br></div><div>Very good list and I am sure t=
here could be a bit more functionalities GTP overlay=C2=A0 has been support=
ing over a period of time *and* still currently being used in various parts=
 of the cellular networks.</div><div><br></div><div><div>Replacing overlays=
 may be a good goal if we can bring the same technical benefits different u=
nderlays (L2, L2.5, IPv4, IPv6) bring to the table in various parts of the =
networks, in this case cellular deployments. We(IETF)=C2=A0 should develop =
tools towards the objective but I suspect we are there to replace any overl=
ay (if this is the central goal) with a single underlay mechanism. Dino pre=
sented multiple times on this topic in various WGs/pre-bofs/BoFs and also a=
sked to &quot;get over with it&quot; (a thin overlay).</div></div><div><br>=
</div><div>One of the things that we all should ask ourselves is - what ove=
rlay functionalities we want to bring to underlay (L3/L2.5) as opposed to c=
omplete replacement of the overlay. IMO, this is a better question than &qu=
ot;replacing&quot;.=C2=A0</div><div><br></div><div>Appreciate=C2=A0your tho=
ughts and views on this.</div><div><br></div><div>Thank you!</div><div>--</=
div><div>Uma C.</div><div><br></div><div><br></div></div><br><div class=3D"=
gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Jul 23, 2021 at =
10:50 AM David Allan I &lt;david.i.allan=3D<a href=3D"mailto:40ericsson.com=
@dmarc.ietf.org">40ericsson.com@dmarc.ietf.org</a>&gt; wrote:<br></div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex">Hi:<br>
<br>
Looking over this draft it strikes me that IF you are discussing a GTP repl=
acement, there are a few unaddressed gaps...or at least I see no mention of=
 them.<br>
<br>
-=C2=A0 adding X2 to the list of interfaces to be supported<br>
-=C2=A0 support for end-marker for handoff stream synchronization (probably=
 could fit the unused bit in Args.Mob.Session but frankly I have not studie=
d this in detail)<br>
-=C2=A0 support for QMP (quality measurement protocol), which I believe nee=
ds to also extend across the radio interface so is not simply local to the =
GTP domain and can be &quot;stunt doubled&quot;<br>
-=C2=A0 support for paging policy presence/indication<br>
<br>
If this has come up elsewhere, let me know<br>
<br>
Cheers<br>
Dave<br>
<br>
<br>
_______________________________________________<br>
dmm mailing list<br>
<a href=3D"mailto:dmm@ietf.org" target=3D"_blank">dmm@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/dmm" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/dmm</a><br>
</blockquote></div>

--000000000000ce3bb705c7cf10c1--


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From: David Allan I <david.i.allan@ericsson.com>
To: Uma Chunduri <umac.ietf@gmail.com>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Fri, 23 Jul 2021 16:52:04 -0700
Message-ID: <CAF18ct6Uj587KR23BuBTT8xBp_Pzod3icmJxzzR8McW3ZzXMiA@mail.gmail.com>
To: David Allan I <david.i.allan@ericsson.com>
Cc: "dmm@ietf.org" <dmm@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dmm/yHfLmp0OyZJKqr70JczlhVTfenc>
Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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--000000000000d6cb4c05c7d317a1
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Dear Dave,

I got what you are saying.

>The sorts of features we are seeing in the larger 3GPP picture AFAIK are
more recent additions for URLLC, CIoT etc.
>So picking and choosing based on convenience is not an option; the problem
space is not a matter of choosing what to support,
>but in replicating the functionality exists and having similar
extensibility.


In this particular case, I am afraid we can even take that kind of
undertaking to create a complete "Stunt Double" as you put it.  I also
believe this is not under the purview of IETF and inevitably we intervene
with their control plane procedures to create this kind of framework.

I still believe we ought to develop value addition functionalities in
the transport network layer, applicable to these deployments which brings a
better E2E service. At the end of the day neither a packet traversing the
network doesn't know which SDO owns this nor the end user consuming the
service.

This is a generic comment and I am not implying to any particular work
being done here.


BR!
--
Uma C.

--000000000000d6cb4c05c7d317a1
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div dir=3D"ltr">Dear Dave,<div><br></div><div>I got what =
you are saying.</div><div><br></div></div><blockquote style=3D"margin:0 0 0=
 40px;border:none;padding:0px"><blockquote style=3D"margin:0 0 0 40px;borde=
r:none;padding:0px"><div dir=3D"ltr"><div>&gt;The sorts of features we are =
seeing in the larger 3GPP picture AFAIK are more recent additions for URLLC=
, CIoT etc. =C2=A0</div><div>&gt;So picking and choosing based on convenien=
ce is not an option; the problem space is not a matter of choosing what to =
support,</div><div>&gt;but in replicating the functionality exists and havi=
ng similar extensibility.=C2=A0</div></div></blockquote></blockquote><div><=
br></div>In this particular case, I am afraid=C2=A0we can even take that ki=
nd of undertaking to create a complete &quot;Stunt Double&quot; as you put =
it.=C2=A0 I also believe this is not under the purview of IETF and inevitab=
ly we intervene with their control plane procedures to create this kind of =
framework.=C2=A0<div><br></div><div>I still believe=C2=A0we ought to develo=
p value addition functionalities in the=C2=A0transport network layer, appli=
cable to these deployments which brings a better E2E service. At the end of=
 the day neither a packet traversing the network doesn&#39;t know which SDO=
 owns this nor the end user consuming the service.=C2=A0</div><div><br></di=
v><div>This is a generic comment=C2=A0and I am not implying to any particul=
ar work being done here.</div><div><br></div><div><br></div><div>BR!</div><=
div>--</div><div>Uma C.<br><div><br></div><div><br><div class=3D"gmail_quot=
e"><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bord=
er-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"EN-US"><d=
iv><div><blockquote style=3D"border-top:none;border-right:none;border-botto=
m:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margi=
n-left:4.8pt;margin-right:0in">
</blockquote>
</div>
</div>
</div>

</blockquote></div><div><br></div></div></div></div>

--000000000000d6cb4c05c7d317a1--


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From: David Allan I <david.i.allan@ericsson.com>
To: Uma Chunduri <umac.ietf@gmail.com>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From nobody Mon Jul 26 06:10:10 2021
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Subject: [DMM] I-D Action: draft-ietf-dmm-srv6-mobile-uplane-14.txt
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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 Garvia
                          Daniel Voyer
                          Charles E. Perkins
	Filename        : draft-ietf-dmm-srv6-mobile-uplane-14.txt
	Pages           : 31
	Date            : 2021-07-26

Abstract:
   This document shows the applicability of SRv6 (Segment Routing IPv6)
   to the user-plane of mobile networks.  The network programming nature
   of SRv6 accomplishes 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.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-dmm-srv6-mobile-uplane/

There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-ietf-dmm-srv6-mobile-uplane-14.html

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-dmm-srv6-mobile-uplane-14


Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/



From nobody Tue Jul 27 11:34:46 2021
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Subject: [DMM] I-D Action: draft-ietf-dmm-srv6-mobile-uplane-15.txt
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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 Garvia
                          Daniel Voyer
                          Charles E. Perkins
	Filename        : draft-ietf-dmm-srv6-mobile-uplane-15.txt
	Pages           : 32
	Date            : 2021-07-27

Abstract:
   This document shows the applicability of SRv6 (Segment Routing IPv6)
   to the user-plane of mobile networks.  The network programming nature
   of SRv6 accomplishes 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.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-dmm-srv6-mobile-uplane/

There is also an HTML version available at:
https://www.ietf.org/archive/id/draft-ietf-dmm-srv6-mobile-uplane-15.html

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-dmm-srv6-mobile-uplane-15


Internet-Drafts are also available by anonymous FTP at:
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Hi Dave,

Many thanks for your comments. Inline with PC.

Cheers,
Pablo.

-----Original Message-----
From: dmm <dmm-bounces@ietf.org> On Behalf Of David Allan I
Sent: viernes, 23 de julio de 2021 19:51
To: dmm@ietf.org
Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mob=
ile-uplane-13

Hi:

Looking over this draft it strikes me that IF you are discussing a GTP repl=
acement, there are a few unaddressed gaps...or at least I see no mention of=
 them.

-  adding X2 to the list of interfaces to be supported
[PC] Do you think there is any new mechanism to be added to the currently d=
efined ones?

-  support for end-marker for handoff stream synchronization (probably coul=
d fit the unused bit in Args.Mob.Session but frankly I have not studied thi=
s in detail)
[PC] User Plane Message encoding is out of the scope of this draft. However=
, draft-murakami-dmm-user-plane-message-encoding-03 proposes a mechanism to=
 encode the Echo Request, Echo Reply, Error Indication, and End Marker.

-  support for QMP (quality measurement protocol), which I believe needs to=
 also extend across the radio interface so is not simply local to the GTP d=
omain and can be "stunt doubled"
[PC] Excellent point. Seems we missed this one in draft-murakami! We can ad=
d in there the QoS Monitoring Packet indicator, as well as the encoding for=
 the timestamps and average DL/UL delays.

-  support for paging policy presence/indication
[PC] Same as previous. Many thanks.=20

[PC], By the way, I've posted an updated revision as the reference to draft=
-murakami was missing.

If this has come up elsewhere, let me know

Cheers
Dave


_______________________________________________
dmm mailing list
dmm@ietf.org
https://www.ietf.org/mailman/listinfo/dmm


From nobody Wed Jul 28 06:34:12 2021
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From: Sridhar Bhaskaran <sridhar.bhaskaran@gmail.com>
Date: Wed, 28 Jul 2021 19:03:55 +0530
Message-ID: <CA+3a8ObT1WV3Z+PSoPTEM2SAqNQZbdZCBJ42Zr_7gyv_JcxcQQ@mail.gmail.com>
To: "Pablo Camarillo (pcamaril)" <pcamaril=40cisco.com@dmarc.ietf.org>
Cc: David Allan I <david.i.allan=40ericsson.com@dmarc.ietf.org>,  "dmm@ietf.org" <dmm@ietf.org>
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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--0000000000006385b705c82f0a28
Content-Type: text/plain; charset="UTF-8"

Hi Pablo / Dave all,

See my additional comment inline marked [SB]

Regards
Sridhar

On Wed, Jul 28, 2021 at 12:06 AM Pablo Camarillo (pcamaril) <pcamaril=
40cisco.com@dmarc.ietf.org> wrote:

> Hi Dave,
>
> Many thanks for your comments. Inline with PC.
>
> Cheers,
> Pablo.
>
> -----Original Message-----
> From: dmm <dmm-bounces@ietf.org> On Behalf Of David Allan I
> Sent: viernes, 23 de julio de 2021 19:51
> To: dmm@ietf.org
> Subject: Re: [DMM] Additional questions/comments on
> draft-ietf-dmm-srv6-mobile-uplane-13
>
> Hi:
>
> Looking over this draft it strikes me that IF you are discussing a GTP
> replacement, there are a few unaddressed gaps...or at least I see no
> mention of them.
>
> -  adding X2 to the list of interfaces to be supported
> [PC] Do you think there is any new mechanism to be added to the currently
> defined ones?
>
> [SB] If we are including X2 then F1U also needs to be considered. Both X2
and F1U also have GTPU flow control mechanism defined in TS 38.425. I am
not sure if a corresponding feedback mechanism exists in SRv6 for flow
control.

-  support for end-marker for handoff stream synchronization (probably
> could fit the unused bit in Args.Mob.Session but frankly I have not studied
> this in detail)
> [PC] User Plane Message encoding is out of the scope of this draft.
> However, draft-murakami-dmm-user-plane-message-encoding-03 proposes a
> mechanism to encode the Echo Request, Echo Reply, Error Indication, and End
> Marker.
>
> -  support for QMP (quality measurement protocol), which I believe needs
> to also extend across the radio interface so is not simply local to the GTP
> domain and can be "stunt doubled"
> [PC] Excellent point. Seems we missed this one in draft-murakami! We can
> add in there the QoS Monitoring Packet indicator, as well as the encoding
> for the timestamps and average DL/UL delays.
>
> -  support for paging policy presence/indication
> [PC] Same as previous. Many thanks.
>
> [PC], By the way, I've posted an updated revision as the reference to
> draft-murakami was missing.
>
> If this has come up elsewhere, let me know
>
> Cheers
> Dave
>
>
> _______________________________________________
> dmm mailing list
> dmm@ietf.org
> https://www.ietf.org/mailman/listinfo/dmm
>
> _______________________________________________
> dmm mailing list
> dmm@ietf.org
> https://www.ietf.org/mailman/listinfo/dmm
>


-- 
 o__
 _>  /__
(_) \(_)... Burn fat not fuel - Bike along to a healthier life and cleaner
world! :)

Sridhar Bhaskaran

--0000000000006385b705c82f0a28
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<div dir=3D"ltr"><div dir=3D"ltr"><div>Hi Pablo / Dave all,</div><div><br><=
/div><div>See my additional comment inline marked [SB]<br></div><div><br></=
div><div>Regards</div><div>Sridhar<br></div></div><br><div class=3D"gmail_q=
uote"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jul 28, 2021 at 12:06 A=
M Pablo Camarillo (pcamaril) &lt;pcamaril=3D<a href=3D"mailto:40cisco.com@d=
marc.ietf.org">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br></div><blockquo=
te class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px =
solid rgb(204,204,204);padding-left:1ex">Hi Dave,<br>
<br>
Many thanks for your comments. Inline with PC.<br>
<br>
Cheers,<br>
Pablo.<br>
<br>
-----Original Message-----<br>
From: dmm &lt;<a href=3D"mailto:dmm-bounces@ietf.org" target=3D"_blank">dmm=
-bounces@ietf.org</a>&gt; On Behalf Of David Allan I<br>
Sent: viernes, 23 de julio de 2021 19:51<br>
To: <a href=3D"mailto:dmm@ietf.org" target=3D"_blank">dmm@ietf.org</a><br>
Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mob=
ile-uplane-13<br>
<br>
Hi:<br>
<br>
Looking over this draft it strikes me that IF you are discussing a GTP repl=
acement, there are a few unaddressed gaps...or at least I see no mention of=
 them.<br>
<br>
-=C2=A0 adding X2 to the list of interfaces to be supported<br>
[PC] Do you think there is any new mechanism to be added to the currently d=
efined ones?<br>
<br></blockquote><div>[SB] If we are including X2 then F1U also needs to be=
 considered. Both X2 and F1U also have GTPU flow control mechanism defined =
in TS 38.425. I am not sure if a corresponding feedback mechanism exists in=
 SRv6 for flow control.</div><div><br></div><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex">
-=C2=A0 support for end-marker for handoff stream synchronization (probably=
 could fit the unused bit in Args.Mob.Session but frankly I have not studie=
d this in detail)<br>
[PC] User Plane Message encoding is out of the scope of this draft. However=
, draft-murakami-dmm-user-plane-message-encoding-03 proposes a mechanism to=
 encode the Echo Request, Echo Reply, Error Indication, and End Marker.<br>
<br>
-=C2=A0 support for QMP (quality measurement protocol), which I believe nee=
ds to also extend across the radio interface so is not simply local to the =
GTP domain and can be &quot;stunt doubled&quot;<br>
[PC] Excellent point. Seems we missed this one in draft-murakami! We can ad=
d in there the QoS Monitoring Packet indicator, as well as the encoding for=
 the timestamps and average DL/UL delays.<br>
<br>
-=C2=A0 support for paging policy presence/indication<br>
[PC] Same as previous. Many thanks. <br>
<br>
[PC], By the way, I&#39;ve posted an updated revision as the reference to d=
raft-murakami was missing.<br>
<br>
If this has come up elsewhere, let me know<br>
<br>
Cheers<br>
Dave<br>
<br>
<br>
_______________________________________________<br>
dmm mailing list<br>
<a href=3D"mailto:dmm@ietf.org" target=3D"_blank">dmm@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/dmm" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/dmm</a><br>
<br>
_______________________________________________<br>
dmm mailing list<br>
<a href=3D"mailto:dmm@ietf.org" target=3D"_blank">dmm@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/dmm" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/dmm</a><br>
</blockquote></div><br clear=3D"all"><br>-- <br><div dir=3D"ltr" class=3D"g=
mail_signature"><div dir=3D"ltr">=C2=A0o__ <br> =C2=A0_&gt; =C2=A0/__ <br> =
(_) \(_)... Burn fat not fuel - Bike along to a healthier life and cleaner =
<br> world! :) <br><br>Sridhar Bhaskaran<br><br></div></div></div>

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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Sridhar Bhaskaran <sridhar.bhaskaran@gmail.com>
CC: David Allan I <david.i.allan@ericsson.com>, "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [SUSPECTED SPAM] Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: Sridhar Bhaskaran <sridhar.bhaskaran@gmail.com>
CC: David Allan I <david.i.allan@ericsson.com>, "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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