Re: [5gangip] New Version Notification for draft-xyx-5gip-ps-01.txt

[Saleem Bhatti <[e-mail]>]

Tom;

On 25 May 2017, at 19:39, Tom Herbert <[e-mail]<mailto:[e-mail]>> wrote:

On Thu, May 25, 2017 at 10:12 AM, Saleem Bhatti <[e-mail]<mailto:[e-mail]>> wrote:
Tom;

On 25 May 2017, at 16:31, Tom Herbert <[e-mail]<mailto:[e-mail]>> wrote:

On Thu, May 25, 2017 at 1:48 AM, Saleem Bhatti <[e-mail]<mailto:[e-mail]>>
wrote:

Tom;

On 24 May 2017, at 16:32, Tom Herbert <[e-mail]<mailto:[e-mail]>> wrote:

On Wed, May 24, 2017 at 5:32 AM, Ca By <[e-mail]<mailto:[e-mail]>> wrote:


Tom -- as a network operator, my ideal scenario just moves the packets.  To
that end, i would like to remove the anchor / touchpoint.

The scaling comment is that any anchor needs to scale to N where N is some
set of users total throughput. This is why ILNP appeals to me and ILA looks
like more of what we already have today with less functionality.

Ca,

ILA is a super set of ILNP use cases. ILA can be used end to end or as
a means to implement an overlay within the network or something in
between. The typical deployment is a hybrid approach. If a non-ILA
enable node is talking to a mobile node communications can go through
a router; else if the node is ILA capable then it can get the ILA
mapping to speak directly to the mobile node and eliminate the
triangular routing.


ILNP does not define an overlay mechanism or a tunnelling mechanism.
However, I do not know a reason that ILNP could not be tunnelled, if
tunnelling was required (for whatever reason).

While ILNP is designed to be end-to-end, it also supports various use-cases
with the deployment of an ILNP-capable site-border router (SBR), e.g. a
router at the edge of a radio (access) network. Such a SBR could be used as
a control and management point for a radio (access) network.

RFC6748 gives an outline of some of the various use cases with an
ILNP-capable SBR (perhaps not all of them are of interest to this list,
however):

- localised numbering (localised addressing)
- site-multihoming
- mobility of whole networks/sites
- traffic engineering options
- options for datacentres, including wide-area virtual machine image
migration
- identity privacy and location privacy

Hi Saleem,

My primary concern about ILNP is this statement from section 4,
RFC6741: "So, transport protocol implementations MUST be modified in
order to operate over ILNP." There are lot of transport protocol
implementations, some of these are not even in the kernel (like QUIC),
and some may be proprietary that we don't even know about.


Agreed.

I'm not
sure it's feasible to require all transport implementations are
updated to understand ILNP.


For ILNP, any protocol state that uses address bits directly potentially
needs to change, e.g. end-to-end state for TCP or UDP. However, I would not
expect application protocols (apart from specific systems
management/control/configuration applications) to use address bits directly
(but lots do).

Overall, moving from IPv6 to ILNPv6 will be much less work that moving from
IPv4 to IPv6, in terms of lines of code.

Of course, if there is a requirement for not refactoring transport layer
code for 5G and onwards, then the solution chosen must have someway of
dealing with that concern in an acceptable way. As far as I know, there is
no such requirement. I totally agree, however, that aiming to minimise
implementation pain is a good goal to aim for.

Also, this requirement probably makes
tunneling hard to do in ILNP without proxying.


I am not sure I understand what you mean here, but I would imagine it
depends on the type/purpose of the tunnel.


These are all possible without the loss of end-to-end state, and so can all
be used together. For ILNPv6, they also preserve the current IPv6 addressing
and numbering practises.

How does ILNP solve the /64 assignment to UEs problem? In this case it
seems the identifier needs to be longer than 64 bits.


A /64 assigned to an ILNPv6 host would be treated as a Locator value - a L64
value. Locator values in ILNPv6 are 64 bits.

ILNPv6 Identifier values - Node ID (NID) values - are also 64 bits.

So, I am not sure why an assignment of a /64 to an ILNPv6 end-node would
require the identifier to be longer than 64 bits.

(My apologies if I have misunderstood your question.)


I think the problem is that there is no single global 64 bit
identifier space in this scenario. So for example, if two UEs get a
/64 address assignment they could each assign </64 prefix>::1 to their
nodes. So if an external node wants to communicate by ILNP for each of
these nodes, what is the identifier?

1 (or ::1 as you have it above).

A ::1 identifier is not unique in
the network,

A NID value MUST be unique within the scope of the Locator (the /64 vlaue), which is all that is required for ILNP.

That is, no two nodes would have the NID value of 1 *and* the same value for the Locator.

For ILNPv6, as for ILNPv6, only the /64 - top 64 bits, the routing prefix, the Locator - is used for routing, so that is enough to get the packet to the correct UE.

Once the packet is at the UE, the UE can then forward the packet to the correct node.

more information is needed (probably about the UEs) to
differentiate them. In other words the logical node is identified by
both its UE and the address that UE assigned it within its
allocation-- that's more than 64 bits of information in the case a UE
is assigned a /64.

That is a L64<->NID binding issue handled locally at the correspondent node (please see RFC6741, Section 5, specifically Section 5.4).

Cheers,
--/Saleem



Tom

Cheers,
--/Saleem



Thanks,
Tom

Cheers,
--/Saleem



Tom


Finally, the 5G ship has already sailed.  Many network are "launching
5G"
this year, and more networks (including the one i work at ) are
committed to
launching "real 5G" in the next 2 to 3 years.  None of the work in this
group is within that 5G scope AFAIK. So, it may be most appropriate to
carry
on the effort at 6G to avoid folks getting confused.

I still hold out hope for ILNP to replace the mobility core at some
future
date, the radio network just does a simple authentication and that is
all.
But, that is my own dream of a simpler world :)  I would suggest the
standard we look for in this group is:  what can we remove from 3GPP 5G
/
6G, not what we can add.  How does the work in this group reduce NET
signalling and user-plane modification from the 3GPP steady state?  How
is
that quantified?

CB



On Tue, May 23, 2017 at 2:53 AM, <[e-mail]<mailto:[e-mail]>> wrote:


Dear all,

We have updated the PS draft on 5G IP issues regarding the planned BoF
in
Prague.

Please check whether we have addressed the comments correctly and
continue
to discuss this towards further improvement.

Thanks a lot – also on behalf of Roland, SungHoon, and Behcet



Best Regards
Dirk



---------- Forwarded message ----------
From: <[e-mail]<mailto:[e-mail]>>
Date: Mon, May 22, 2017 at 1:22 PM
Subject: New Version Notification for draft-xyx-5gip-ps-01.txt
To: Behcet Sarikaya <[e-mail]<mailto:[e-mail]>>, Tom Herbert
<[e-mail]<mailto:[e-mail]>>, Roland Schott <[e-mail]<mailto:[e-mail]>>,
SungHoon
Seo <[e-mail]<mailto:[e-mail]>>, Roland Schott <[e-mail]<mailto:[e-mail]>>, Dirk von
Hugo
<[e-mail]<mailto:[e-mail]>>, Satish Kanugovi <[e-mail]<mailto:[e-mail]>>



A new version of I-D, draft-xyx-5gip-ps-01.txt
has been successfully submitted by Behcet Sarikaya and posted to the
IETF repository.

Name:           draft-xyx-5gip-ps
Revision:       01
Title:          5G IP Access and Session Management Protocols
Document date:  2017-05-22
Group:          Individual Submission
Pages:          14
URL:
https://www.ietf.org/internet-drafts/draft-xyx-5gip-ps-01.txt
Status:         https://datatracker.ietf.org/doc/draft-xyx-5gip-ps/
Htmlized:       https://tools.ietf.org/html/draft-xyx-5gip-ps-01
Htmlized:
https://datatracker.ietf.org/doc/html/draft-xyx-5gip-ps-01
Diff:           https://www.ietf.org/rfcdiff?url2=draft-xyx-5gip-ps-01

Abstract:
This document builds upon 5G IP issues work and - based on a
simplified 5G system architecture - attempts to make the case for a
possible set of new protocols that need to be developed to be used
among various virtualized functions in a 5G network.




Please note that it may take a couple of minutes from the time of
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