[arin-ppml] Draft Policy ARIN-2013-2: 3GPP Network IP Resource Policy

Scott Leibrand scottleibrand at gmail.com
Wed Mar 27 14:32:24 EDT 2013

As one of the AC shepherds for the policy, I am hoping to have a
discussion, both here on PPML at at the upcoming ARIN meeting, to cover a
few key points:

 - Is the problem statement clear to the community?  Do you have any
questions on the problem the proposal is attempting to solve?

 - Do you feel that it is an important problem to try to solve?  Do you
have any reasons you can share that we should or shouldn't do so?

 - If so, how would you prefer we approach solving it?  Some suggestions
are outlined in the proposal below, but we'll need to decide on an approach
and write and discuss actual policy text in order to move this Draft Policy
forward.  This proposal will *not* be eligible for last call after ARIN 31
in Barbados, but we will be discussing it there.

So if you have any input now, please speak up.  We'll be locking down the
version of the Draft Policy that will be printed in the ARIN 31 discussion
guides by April 5th, so please provide any input you can before then.


On Wed, Mar 27, 2013 at 11:20 AM, ARIN <info at arin.net> wrote:

> Draft Policy ARIN-2013-2
> 3GPP Network IP Resource Policy
> On 21 March 2013 the ARIN Advisory Council (AC) accepted "ARIN-prop-184
> 3GPP Network IP Resource Policy" as a Draft Policy.
> Draft Policy ARIN-2013-2 is below and can be found at:
> https://www.arin.net/policy/**proposals/2013_2.html<https://www.arin.net/policy/proposals/2013_2.html>
> You are encouraged to discuss the merits and your concerns of Draft Policy
> 2013-2 on the Public Policy Mailing List. 2013-2 will also be on the agenda
> at the upcoming ARIN Public Policy Meeting in Barbados. The AC will
> evaluate the discussion in order to assess the conformance of this draft
> policy with ARIN's Principles of Internet Number Resource Policy as stated
> in the PDP. Specifically, these principles are:
>  * Enabling Fair and Impartial Number Resource Administration
>  * Technically Sound
>  * Supported by the Community
> The ARIN Policy Development Process (PDP) can be found at:
> https://www.arin.net/policy/**pdp.html<https://www.arin.net/policy/pdp.html>
> Draft Policies and Proposals under discussion can be found at:
> https://www.arin.net/policy/**proposals/index.html<https://www.arin.net/policy/proposals/index.html>
> Regards,
> Communications and Member Services
> American Registry for Internet Numbers (ARIN)
> ## * ##
> Draft Policy ARIN-2013-2
> 3GPP Network IP Resource Policy
> Date: 27 March 2013
> Problem Statement:
> Current 3GPP architectures consist of hierarchical aggregation, from cell
> site up to anchor nodes, approximately one per NFL city. Anchor nodes are
> the point where IP addresses are assigned and topologically positioned in
> the network. Generally an anchor node must be provisioned with enough
> addresses to handle all simultaneously attached users, plus enough headroom
> to handle failover from an adjacent anchor node in the event of an outage.
> Capacity planning generally ensures that all anchor nodes have
> approximately the same number of attached users at steady state. Moving
> addresses between anchor nodes would require significant renumbering effort
> and substantial increases in operational complexity, so cannot be performed
> during an outage. Generally addresses are not renumbered between anchor
> nodes: instead, aggregation nodes can be rehomed as needed to balance
> steady state capacity levels. Because of the 3GPP architecture's failover
> and capacity planning requirements, all cellular networks target
> approximately 50% simultaneous usage of each anchor node's IP addresses.
> However, even at 50% usage, the total number of subscribers generally
> exceeds the number of addresses needed.
> Currently, a number of mobile networks are using non-RIR-assigned space
> internally to meet customer demand. However, there is insufficient private
> space (RFC1918, etc.) available for internal use, so other unassigned space
> is currently being used. As this unassigned space is brought into service
> via reclamation, returns, and transfers, it is no longer possible to use it
> internally, so globally unique space must be used instead. As a result,
> most of the need for additional RIR-assigned space is to serve existing
> customers, not to accommodate future growth.
> Policy statement:
> I can see two possible approaches to address this need. One approach would
> be to continue counting simultaneously attached users to measure IP needs,
> and apply a 50% usage requirement to justify allocations. Another approach
> would be to instead count total subscribers (rather than simultaneously
> attached users), and apply a much higher threshold, such as 80% or even
> 90%, to justify allocations.
> Timetable for implementation: ASAP
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