Network-Based Mobility Extensions (netext)
------------------------------------------

 Charter
 Last Modified: 2011-08-18

 Current Status: Active Working Group

 Chair(s):
     Rajeev Koodli  <rkoodli@cisco.com>
     Basavaraj Patil  <basavaraj.patil@nokia.com>

 Internet Area Director(s):
     Ralph Droms  <rdroms.ietf@gmail.com>
     Jari Arkko  <jari.arkko@piuha.net>

 Internet Area Advisor:
     Jari Arkko  <jari.arkko@piuha.net>

 Mailing Lists: 
     General Discussion:netext@ietf.org
     To Subscribe:      https://www.ietf.org/mailman/listinfo/netext
     Archive:           http://www.ietf.org/mail-archive/web/netext/current/maillist.html

Description of Working Group:

Proxy Mobile IPv6, specified in RFC 5213, is a network-based mobility
protocol. It uses a Mobile Access Gateway (MAG) and a Local Mobility
Anchor (LMA) to allow hosts to move around within a domain while keeping
their address or address prefix stable. Proxy Mobile IPv6 has been
incorporated into a number of products and deployments are starting.
Certain deployment considerations, including localized routing and bulk
refresh of lifetime are already emerging.

The working group will focus on the following topics relevant for
network-based mobility:

Localized Routing: a specification for routing traffic between the
MAG(s) without involving the LMA. That is, allow the MAGs to route
traffic between hosts from one MAG to another, without being tunneled
all the way to the LMA. This reduces latency and backhaul load.
Applications such as voice can benefit from the reduced latency.
The working group will produce a problem statement and a
specification of the localized routing mechanism.

Bulk Refresh: a specification of improving the signaling load for
binding lifetime refresh. The current specifications call for the
handling of each mobility session independent of each other. When a
large number of hosts are served by a single MAG, a periodic refresh of
the binding lifetimes can lead to a signaling storm. The purpose of the
Bulk Refresh feature is to construct a protocol feature that allows such
refreshes to occur on a per-MAG basis.

LMA Redirection: a specification for allowing an LMA to redirect a MAG
to another LMA. This is primarily needed as a way to perform load
balancing. This functionality is complementary to implementation
techniques that allow distributed MAG implementations to move tasks
around without a visible impact at the protocol level, and the
initial LMA discovery work in the NETLMM WG. An applicability statement
describing the situations where the new functionality is or is not
applicable has to be included in the specification.

Hiding access technology changes from host IP layer: Proxy mobility is
based on the assumption that changes in host IP stacks are
undesirable. However, link layer implementations can hide the
actually used physical interfaces from the IP stack. For instance, a
"logical interface" at the IP layer may enable packet transmission and
reception over different physical media. Such techniques can be used
to achieve inter-access handovers or flow mobility, i.e., the movement
of selected flows from one access technology to another. It is
assumed that an IP layer interface can simultaneously and/or
sequentially attach to multiple MAGs (possibly over multiple media).
The hiding mechanisms also need to work together with existing RFC
5213 handover hint mechanisms. The specification of any actual link
layer mechanisms is outside the scope of the working group, but the
group works on the following:

- Informational applicability statement that analyzes the issues
involved with this approach and characterizes the contexts in which
such use is or is not appropriate.

- The working group will determine what protocol extensions are
required between the Proxy Mobile IPv6 network nodes (MAGs and LMAs)
to support the ability for an interface (at the IP layer) to
transmit packets over different media, the ability to distribute
specific traffic flows on different media components of that
interface, and making this work with the handover hints in the base
protocol. The relevant protocol extensions will be developed as
necessary.

Radius Extensions to PMIP6: In order to enable network based
mobility using PMIP6, the policy profile needs to signal a set of
attributes and policies to the MAG and LMA. New Radius attributes
need to be specified that are relevant to PMIP6 based
mobility. This work item will specify Radius extensions and
attributes specific to PMIP6.

The work in this charter is entirely internal to the network and does
not affect host IP stack operation in any way (except perhaps through
impacting packet forwarding capacity visible to the hosts). The working
group is not allowed to specify new IP layer protocol mechanisms to 
signal mobility related events between the host and the network.

The proposed activity will be complementary to the existing IETF Working
Groups, notably the NETLMM and MEXT WGs. The NETEXT working group will
also act as the primary forum where new extensions on top of the Proxy
Mobile IPv6 protocol can be developed. The addition of such new
extensions to the working group involves addition of the extension to
this charter through the normal rechartering process.

 Goals and Milestones:

   Done         WG chartered 

   Done         Initial WG draft on Bulk Refresh 

   Done         Decision on the inclusion of possible additional work items 

   Done         Initial WG draft on LMA Redirection 

   Done         Initial WG draft on Localized Routing Problem Statement 

   Mar 2010       Submit Bulk Refresh to IESG for publication as a Proposed 
                Standard RFC 

   Mar 2010       Submit LMA Redirection to IESG for publication as a Proposed 
                Standard RFC 

   Mar 2010       Initial WG document on RADIUS extensions to PMIP6 

   May 2010       Submit Localized Routing Problem Statement to IESG for 
                publication as an Informational RFC 

   May 2010       Initial WG draft on Localized Routing Solution 

   Jul 2010       Initial WG document on Applicability Statement on Logical 
                Interface over Multiple Physical Interfaces 

   Jul 2010       WG decision on what Proxy Mobile IPv6 mechanisms are needed to 
                support flow mobility and inter-access handovers on a logical 
                interface over multiple physical interfaces 

   Oct 2010       Initial WG document(s) on Proxy Mobile IPv6 Extensions to 
                Support Flow Mobility and Inter-access Handovers on a Logical 
                Interface over Multiple Physical Interfaces 

   Dec 2010       Submit RADIUS extensions to PMIP6 to IESG for publication as a 
                Proposed Standard 

   Dec 2010       Submit Applicability Statement on Logical Interface over 
                Multiple Physical Interfaces to IESG for publication as 
                Informational RFC 

   Feb 2011       Submit Proxy Mobile IPv6 Extensions to Support Flow Mobility 
                and Inter-access Handovers on a Logical Interface over Multiple 
                Physical Interfaces for publication as Proposed Standard RFC(s) 

   Feb 2011       Submit Localized Routing Solution to IESG for publication as a 
                Proposed Standard RFC 


 Internet-Drafts:

Posted Revised         I-D Title   <Filename>
------ ------- --------------------------------------------
Oct 2009 Oct 2011   <draft-ietf-netext-redirect-12.txt>
                Runtime LMA Assignment Support for Proxy Mobile IPv6 

Jan 2010 Oct 2011   <draft-ietf-netext-bulk-re-registration-08.txt>
                Bulk Re-registration Support for Proxy Mobile IPv6 

May 2010 Sep 2011   <draft-ietf-netext-radius-pmip6-05.txt>
                RADIUS Support for Proxy Mobile IPv6 

Aug 2010 Sep 2011   <draft-ietf-netext-logical-interface-support-03.txt>
                Logical Interface Support for multi-mode IP Hosts 

Sep 2010 Oct 2011   <draft-ietf-netext-pmip-lr-06.txt>
                Localized Routing for Proxy Mobile IPv6 

Aug 2011 Aug 2011   <draft-ietf-netext-pd-pmip-00.txt>
                Prefix Delegation for Proxy Mobile IPv6 

Aug 2011 Aug 2011   <draft-ietf-netext-pmipv6-sipto-option-00.txt>
                IPv4 Traffic Offload Selector Option for Proxy Mobile IPv6 

Aug 2011 Aug 2011   <draft-ietf-netext-access-network-option-00.txt>
                Access Network Information Option for Proxy Mobile IPv6 

Sep 2011 Sep 2011   <draft-ietf-netext-pmipv6-flowmob-01.txt>
                Proxy Mobile IPv6 Extensions to Support Flow Mobility 

 Request For Comments:

  RFC   Stat Published     Title
------- -- ----------- ------------------------------------
RFC6279 I    Jun 2011    Proxy Mobile IPv6 (PMIPv6) Localized Routing Problem 
                       Statement