NEMO Working Group                                              T. Ernst
Internet-Draft                                   WIDE at Keio University
Expires: August 16, April 25, 2005                                        H-Y. Lach
                                                           Motorola Labs
                                                        October 25, 2004

                  Network Mobility Support Terminology
                     draft-ietf-nemo-terminology-02

Abstract

   This document defines a terminology for discussing network mobility
   issues and solution requirements.

NEMO Working Group                                              T. Ernst
Internet-Draft                                   WIDE at Keio University
Expires: April 25, 2005                                        H-Y. Lach
                                                           Motorola Labs
                                                       February 16,
                                                        October 25, 2004

                  Network Mobility Support Terminology
                     draft-ietf-nemo-terminology-01
                     draft-ietf-nemo-terminology-02

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Copyright Notice

   Copyright (C) The Internet Society (2004). All Rights Reserved.

Abstract

   This document defines a terminology for discussing network mobility
   problems
   issues and solution requirements. Network mobility arises when a
   router connecting an entire network to the Internet dynamically
   changes its point of attachment to the Internet therefrom causing the
   reachability of the entire network to be changed in the topology.
   Such kind of network is referred to as a mobile network. Without
   appropriate mechanisms, sessions established between nodes in the
   mobile network and the global Internet cannot be maintained while the
   mobile router changes its point of attachment.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4

   2.  Architecture Components  . . . . . . . . . . . . . . . . . .   4

   3.   Functional Terms . . . .  4
     2.1   Mobile Network (NEMO)  . . . . . . . . . . . . . . . . . .   5
   3.1  6
     2.2   Mobile Network . Router (MR) . . . . . . . . . . . . . . . . . . . .  6
     2.3   Egress Interface (E-face)  . .   6
   3.2  NEMO . . . . . . . . . . . . . .  7
     2.4   Ingress Interface (I-face) . . . . . . . . . . . . . .   6
   3.3  MONET [DEPRECIATED] . .  7
     2.5   Mobile Network Prefix (MNP)  . . . . . . . . . . . . . . .  7
     2.6   NEMO-link  . . .   6
   3.4  Mobile Router (MR) . . . . . . . . . . . . . . . . . . . . .  7
   3.5  Egress Interface (E-face)  .
     2.7   Mobile Network Node (MNN)  . . . . . . . . . . . . . . . .  7
   3.6  Ingress Interface (I-face)
     2.8   Correspondent Node (CN)  . . . . . . . . . . . . . . . . .  7
   3.7  NEMO-prefix (MNP)

   3.  Functional Terms . . . . . . . . . . . . . . . . . . . . .   7
   3.8  NEMO-link . .  8
     3.1   Local Fixed Node (LFN) . . . . . . . . . . . . . . . . . .  8
     3.2   Visiting Mobile Node (VMN) . . . . .   7
   3.9  Mobile Network Node (MNN) . . . . . . . . . . .  9
     3.3   Local Mobile Node (LMN)  . . . . . .   7
   3.10 Node behind the MR . . . . . . . . . . .  9
     3.4   NEMO-enabled node (NEMO-node)  . . . . . . . . . .   7
   3.11 Local Fixed Node (LFN) . . . .  9
     3.5   MIPv6-enabled (MIPv6-node) . . . . . . . . . . . . . . .   7
   3.12 Local Mobile Node (LMN)  . . . . 10
     3.6   Correspondent Router (CR)  . . . . . . . . . . . . . .   7
   3.13 Visiting Mobile Node (VMN) . . 10

   4.  Nested Mobility Terms  . . . . . . . . . . . . . . .   7
   3.14 NEMO-enabled (NEMO-node) . . . . . 10
     4.1   Nested Mobile Network (nested-NEMO)  . . . . . . . . . . . 11
     4.2   root-NEMO  . .   8
   3.15 NEMO-enabled MR . . . . . . . . . . . . . . . . . . . . . .   8
   3.16 MIPv6-enabled (MIPv6-node) 11
     4.3   parent-NEMO  . . . . . . . . . . . . . . . . .   9
   3.17 Correspondent Node (CN) . . . . . . 11
     4.4   sub-NEMO . . . . . . . . . . . .   9

   4.   Nested Mobility Terms . . . . . . . . . . . . . 11
     4.5   root-MR  . . . . . .   9
   4.1  Nested Mobile Network . . . . . . . . . . . . . . . . . . .   9
   4.2  root-NEMO 11
     4.6   parent-MR  . . . . . . . . . . . . . . . . . . . . . . . . 11
     4.7   sub-MR .   9
   4.3  parent-NEMO . . . . . . . . . . . . . . . . . . . . . . . .   9
   4.4  sub-NEMO . 12

   5.  Multihoming Terms  . . . . . . . . . . . . . . . . . . . . . . 13
     5.1   Multihomed host or MNN . . .  10
   4.5  root-MR (or TLMR, but depreciated) . . . . . . . . . . . . .  10
   4.6  parent-MR . . 13
     5.2   Multihomed Mobile Router . . . . . . . . . . . . . . . . . 13
     5.3   Multihomed Mobile Network (multihomed-NEMO)  . . . . . .  10
   4.7  sub-MR . 14
     5.4   Nested Multihomed Mobile Network . . . . . . . . . . . . . 14
     5.5   Illustration . . . . . . . . . . . . .  10

   5.   Multihoming Terms . . . . . . . . . . 15

   6.  Home Network Model Terms . . . . . . . . . . .  11
   5.1  Multihomed Host . . . . . . . . 16
     6.1   Home Link  . . . . . . . . . . . . . .  11
   5.2  Multihomed Mobile Router . . . . . . . . . . 16
     6.2   Home Network . . . . . . . .  12
   5.3  Multihomed Mobile Network . . . . . . . . . . . . . . . 17
     6.3   Home Address . .  13
   5.4  Multihomed and Nested Mobile Network . . . . . . . . . . . .  13
   5.5  Illustration . . . . . . . . . 17
     6.4   Mobile Home Network  . . . . . . . . . . . . . . .  14

   6.   Mobility Support Terms . . . . 17
     6.5   Distributed Home Network . . . . . . . . . . . . . . .  15
   6.1  Host mobility support . . 17
     6.6   Mobile Aggregated Prefix . . . . . . . . . . . . . . . . .  15
   6.2 17
     6.7   Aggregated Home Network Mobility support (NEMO Support)  . . . . . . . . . .  15
   6.3  NEMO Basic Support . . . . . . . 17
     6.8   Extended Home Network  . . . . . . . . . . . . . .  16
   6.4  NEMO Extended Support . . . . 17
     6.9   Virtual Home Network . . . . . . . . . . . . . . .  16

   7.   New Text From Usage Draft . . . . 17
   7.  Mobility Support Terms . . . . . . . . . . . . .  16
   7.1  Home Link . . . . . . . 18
     7.1   Host Mobility Support  . . . . . . . . . . . . . . . . . .  16 18
     7.2  Home   Network Mobility Support (NEMO Support)  . . . . . . . . . 18
     7.3   NEMO Basic Support . . . . . . . . . . . . . . .  16
   7.3  Home Address . . . . . . 18
     7.4   NEMO Extended Support  . . . . . . . . . . . . . . . . . .  16
   7.4 18
     7.5   MRHA Tunnel  . . . . . . . . . . . . . . . . . . . . . . . .  16
   7.5  Mobile Aggregated Prefix . . . . . . . . . . . . . . . . . .  16
   7.6  Aggregated Home Network  . . . . . . . . . . . . . . . . . .  16
   7.7  Extended Home Network  . . . . . . . . . . . . . . . . . . .  17
   7.8  Virtual Home Network . . . . . . . . . . . . . . . . . . . .  17 18

   8.  Miscellaneous Terms  . . . . . . . . . . . . . . . . . . . .  17 . 18
     8.1   Idle MNN . . . . . . . . . . . . . . . . . . . . . . . . . .  17 18
     8.2   Idle Mobile Network  . . . . . . . . . . . . . . . . . . . .  17 18

   9.  Changes since draft-nemo-terminology-00.txt draft-nemo-terminology-01.txt  . . . . . . . .  17 . 19

   10.   Changes since draft-nemo-terminology-00.txt  . . . . . . . . 19

   11.   Acknowledgments  . . . . . . . . . . . . . . . . . . . . . .  18 20

   12.   References . . . . . . . . . . . . . . . . . . . . . . . . .  18 20

       Authors' Addresses . . . . . . . . . . . . . . . . . . . . .  19 . 21

       Intellectual Property and Copyright Statements . . . . . . .  20 . 22

1.  Introduction

   Network mobility support is concerned with managing the mobility of
   an entire network.  This arises when a router connecting an entire
   network which to the Internet dynamically changes its point of attachment
   to the Internet and thus its therefrom causing the reachability of the entire
   network to be changed in the Internet topology. If  Such network mobility is not explicitly supported by some mechanisms, referred to
   as a mobile network.  Without appropriate mechanisms to support
   network mobility, sessions established between nodes in the mobile
   network and the global Internet cannot be maintained while the mobile
   router changes its point of attachment.  As a result, existing
   sessions would break and connectivity to the global Internet is would be
   lost.

   This document defines the specific terminology needed to describe the
   problem space we face with network mobility and to edict space, the
   solutions design goals [4], and the requirements they must comply with. solutions for network
   mobility support.  This terminology complies with the usual IPv6
   terminology [7] and the generic mobility-related terms already
   defined in [2] [3] and in the Mobile IPv6 [1] specifications.  Some terms
   introduced in the present version of the draft may only be useful for
   the purpose of defining the problem scope and functional requirements
   of network mobility
   support and shall be removed or refined once we agree on the
   requirements.

   The first section introduces terms to define the architecture
   components; the second introduces terms to discuss the requirements,
   the third, terms to discuss nested mobility; support.

   Note that the forth defines
   multihoming, abbreviation NEMO stands either for "a NEtwork that is
   MObile" and the last, miscellaneous terms which do not fit in
   either sections. for "NEtwork MObility".  The overall terminology former (see Section 2.1 is summarized in fig.1 to 5.
   Fig.1 shows a single mobile subnetwork. Fig.2. shows a larger mobile
   network comprising several subnetworks, attached on a foreign link.
   Fig.3 illustrates
   used as a node changing its point of attachment within the noun, e.g.  "a NEMO" meaning "a mobile network. Fig.4 and 5 illustrate nested mobility whereas Fig.6 network".  The
   latter (see Section 7 refers to Fig.8 illustrate multihoming.

2. Architecture Components

   Fig.1 the concept of "network mobility" as
   in "NEMO Basic Support" and is also the working group's name.

   Section 2 illustrate introduces terms to define the architecture while terms
   needed to emphasize the distinct functionalities of those
   architecture components involved are described in
   network mobility. The Section 3.  Section 4,
   Section 5 and Section 6 respectively describe terms "Fixed Node (FN)", "Mobile Node (MN)",
   "Mobile Network", "Mobile Router (MR)", "Mobile Network Node (MNN)",
   "home link", "foreign link", "ingress interface", "egress interface",
   access router (AR), home link, foreign link pertaining to
   nested mobility, multihoming and those necessary to describe the
   different configurations of mobile networks at home.  The different
   types of mobility are defined in [2]. Section 7.  The last section lists
   miscellaneous terms which do not fit in either sections.

2.  Architecture Components

   A mobile network is composed by one or more mobile IP-subnet
   (NEMO-link) and is viewed as a single unit. It  The unit is connected to
   the Internet by means of mobile routers (MRs).  Nodes behind the MR
   (MNNs) primarily comprise fixed nodes (nodes unable to change their
   point of attachment while maintaining ongoing sessions), and
   additionally mobile nodes (nodes able to change their point of
   attachment while maintaining ongoing sessions).  In most cases, the
   internal structure of the mobile network will in effect be relatively
   stable (no dynamic change of the topology), but this is not a general
   assumption.

         ____
        |    |
        |

   Figure 1 illustrates the architecture components involved in network
   mobility and defined in the below paragraphs: Mobile Router (MR),
   NEMO-link, Mobile Network Node (MNN), "ingress interface", "egress
   interface", and Correspondent Nodes (CNs).  The other terms "access
   router" (AR), "Fixed Node (FN)", "Mobile Node (MN)", "home agent"
   (HA), "home link" and "foreign link" are not terms specific to
   network mobility and are thus defined in [3].

                     _
               CN |
        |____|
       ___|____________________
      |                        |
      |                        |
      | ->|_|-| Internet
                        |  _____
                        |-|     |       |<- home link
                       _  |
      |________________________|
         __|_            __|_
        |    |  Access  |    |
        | AR     |-|  _  |  Router  _
                    |-|_|-|_____| |-|_|-|-|_|<- HA (Home Agent)
                    | AR  ^                |
        |____|          |____|
     ______|__  _
     foreign   __|_____________ home link               __|_    link
                                 |    |
                                 | ->|  .                |-|_|<- MR | (Mobile Router)
                       .. AR (access    ___|___
                             router)     _|  |_
                                        |_|  |_|
                                         ^    ^
                                      MNN1    MNN2

               Figure 1: Mobile Router
                                 |____|
                           _________|_______  NEMO-link
                            __|__     __|__ Network on the Home Link

   Figure 2 shows a single mobile subnetwork.  Figure 3 illustrates a
   larger mobile network comprising several subnetworks, attached on a
   foreign link.

                             _
                       CN ->|_|-|
                                |  _____
                   _  |         |-|     |       |<- home link
                  |_|-|  _  |  _  |     |-|  _  | MNN  _
         2 MNNs -> _  |-|_|-|-|_|-|_____| |-|_|-|-|_|<- HA
                  |_|-|  .  |                .  | MNN
                      |  .  |<- foreign      .
   single NEMO-link ->   .       link        ^ AR
                         .
                         ^ MR

          Figure 2: Single Mobile Network Nodes
                           |_____|   |_____|

   Fig.1: Architecture Components Subnetwork on a Foreign Link

   At the network layer, MRs get access to the global Internet from the
   Access Routers (ARs) on the visited link.  The MR maintains MRs maintain the
   Internet connectivity for the entire mobile network. It  A given MR has
   one or more egress interface(s) and one or more ingress interface(s).
   When forwarding a packet to the Internet the packet is transmitted
   upstream through one of the MR's egress interfaces to the AR; when
   forwarding a packet from the AR down to the mobile network, the
   packet is transmitted downstream through one of the MR's ingress
   interfaces.

3. Functional Terms

               ________________________
              |                        |
              |                        |
              |       Internet         |
              |                        |
              |________________________|
                      __|_
             Access  |    |
             Router  | AR |
                     |____|
          foreign _____|_____________
           link                   |
                                  | 'e'
                                __|__
                          | 'i'|     |
                          |____| MR  | Mobile Router
                          |    |_____|
                          |       |'i'
                          |       |
                          |   ____|________________ NEMO-link 1
                          |     __|__         __|__
                  _____   |    |     |       |     |
                 |     |__|    | MNN |       | MNN |
                 | MNN |  |    |_____|       |_____|
                 |_____|  |
                          | NEMO-link 2   'i': MR's ingress interface
                                          'e': MR's egress interface

   Fig.2: Larger

2.1  Mobile Network with 2 subnets

   Within (NEMO)

   As defined in [3]:

   An entire network, moving as a unit, which dynamically changes its
   point of attachment to the term Mobile Network Node (MNN), we can distinguish between
   LFN, VMN Internet and LMN. thus its reachability in the
   topology.  The distinction mobile network is a property of how different
   types composed of nodes can move in the topology one or more IP-subnets
   and is necessary connected to discuss
   issues related the global Internet via one or more Mobile
   Routers (MR).  The internal configuration of the mobile network is
   assumed to mobility management and access control, but does
   not preclude that mobility should be handled differently. Nodes are
   classified according to their function and capabilities relatively stable with respect to the
   rationale that nodes with different properties (may) have different
   requirements.

3.1 MR.

2.2  Mobile Network Router (MR)

   As defined in [2])

3.2 NEMO

   An abbreviation either for "NEtwork MObility" or for " a NEtwork that
   is MObile". It the former, it refers [3]:

   A router capable of changing its point of attachment to the concept network,
   moving from one link to another link.  The MR is capable of "network
   mobility" like in "NEMO Basic Support"
   forwarding packets between two or more interfaces, and is also the working
   group's name. In possibly
   running a dynamic routing protocol modifying the latter, state by which it is used as a noun, e.g. "a NEMO"
   meaning "a mobile network".

3.3 MONET [DEPRECIATED]
   An abbreviation for MObile NETwork. MONET can be used
   does packet forwarding.

   A MR acting as a noun, e.g.
   a MONET" meaning "a gateway between an entire mobile network". Not network and the
   rest of the Internet has one or more egress interface(s) and one or
   more ingress interface(s).  Packets forwarded upstream to be confused with MANET
   (Mobile Ad-hoc NETwork)

3.4 Mobile Router (MR)

   As defined in [2])

3.5 the rest of
   the Internet are transmitted through one of the MR's egress
   interface; packets forwarded downstream to the mobile network are
   transmitted through one of the MR's ingress interface.

2.3  Egress Interface (E-face)

   As defined in [2])

3.6 [3]:

   The interface of a MR attached to the home link if the MR is at home,
   or attached to a foreign link if the MR is in a foreign network.

2.4  Ingress Interface (I-face)

   As defined in [2])

3.7 NEMO-prefix (MNP)

   An acronym for [3]:

   The interface of a MR attached to a link inside the mobile network.

2.5  Mobile Network Prefix (as (MNP)

   As defined in [2])

3.8 [3]:

   A bit string that consists of some number of initial bits of an IP
   address which identifies the entire mobile network within the
   Internet topology.  All nodes in a mobile network necessarily have an
   address containing this prefix.

   MNP is an acronym for Mobile Network Prefix.

2.6  NEMO-link

   A link (subnet) located within the mobile network.

3.9

2.7  Mobile Network Node (MNN)

   As defined in [2]).  May be [3]:

   Any node (host or router) located within a mobile network, either
   permanently or temporarily.  A Mobile Network Node may either be a LFN, LMN,
   fixed node (LFN) or a VMN.

3.10 mobile node (VMN or LMN).

2.8  Correspondent Node behind the MR (CN)

   Any MNN node that is communicating with one or more MNNs.  A CN could be
   either located in within a fixed network or within a mobile network, and
   could be either fixed or mobile.

3.  Functional Terms

               ________________________
              |                        |
              |                        |
              |       Internet         |
              |                        |
              |________________________|
                      __|_
             Access  |    |
             Router  | AR |
                     |____|
          foreign _____|_____________
           link                   |
                                  | 'e'
                                __|__
                          | 'i'|     |
                          |____| MR  | Mobile Router
                          |    |_____|
                          |       |'i'
                          |       |
                          |   ____|________________ NEMO-link 1
                          |     __|__         __|__
                  _____   |    |     |       |     |
                 |     |__|    | MNN |       | MNN |
                 | MNN |  |    |_____|       |_____|
                 |_____|  |
                          | NEMO-link 2   'i': MR's ingress interface
                                          'e': MR's egress interface

             Figure 3: Larger Mobile Network with 2 subnets

   Within the term Mobile Network Node (MNN), we can distinguish between
   Local Fixed Node (LFN), Visiting Mobile Node (VMN) and Local Mobile
   Node (LMN).  The distinction is a mobile network, beside the MRs connecting property of how different types of
   nodes can move in the
   mobile topology and is necessary to discuss issues
   related to mobility management and access control, but does not imply
   that network mobility or host mobility should be handled differently.
   Nodes are classified according to their function and capabilities
   with the Internet.

3.11 rationale that nodes with different properties (may) have
   different requirements.

3.1  Local Fixed Node (LFN)

   A fixed node (FN), either a host or a router, that belongs to the
   mobile network and which doesn't move topologically with respect to
   the MR. It's address is taken from a NEMO-prefix.

3.12 Local Mobile Node (LMN)

   A mobile node (MN), either a host or a router which can move
   topologically with respect to the MR and whose home link belongs unable to
   the mobile network. It's change its point of attachment
   while maintaining ongoing sessions.  Its address is taken from a NEMO-prefix.

3.13 MNP.

3.2  Visiting Mobile Node (VMN)

   A mobile node (MN), either a host or a router which can move
   topologically with respect to the MR and whose home link doesn't
   belong to the mobile network. network and which is able to change its point of
   attachment while maintaining ongoing sessions.  A VMN that gets
   temporarily attached to a NEMO-link (used as a foreign link) obtains
   an address on that link (i.e.  the address is taken from a MNP).

3.3  Local Mobile Node (LMN)

   A mobile node (MN), either a host or a router whose home link belongs
   to the mobile network and which is able to change its point of
   attachment while maintaining ongoing sessions.  Its address is taken
   from a NEMO-prefix).

3.14 MNP.  Figure 4 illustrates a LMN changing its point of
   attachment within the mobile network.

3.4  NEMO-enabled node (NEMO-node)

   A node that has been extended with network mobility support
   capabilities and that may take special actions based on that (details that.

   In NEMO Basic Support, only the MR and the HA are NEMO-enabled.

   In NEMO Extended Support, details of the capabilities are not known
   yet, but it NEMO-enabled nodes may be implementing some sort of Route Optimization).
   Optimization.

               ________________________
              |                        |
              |                        |
              |       Internet         |
              |                        |
              |________________________|
                 __|_            __|_
                |    |  Access  |    |
                | AR |  Router  | AR |
                |____|          |____|
                 __|_         _____|_____________ foreign
                |    |                     _|__   link
                | MN |                 |  |    |
                |____|         _____   |__| MR | Mobile Router
                              |     |__|  |____|
                        |-->  | LMN |  |   __|_____________ NEMO-link 1
                        |     |_____|  |   __|__       |
                        |      _____   |  |     |
                        |     |     |__|  | LFN |
                        |     | LFN |  |  |_____|      |
                        |     |_____|  |               |
                        |              | NEMO-link 2   |
                        |                              |
                        |------------------------------|

   Fig.3:

                        Figure 4: LFN and LMN: versus LMN changing from NEMO-link 1 to NEMO-link 2

3.15 NEMO-enabled MR

3.5  MIPv6-enabled (MIPv6-node)

   A mobile router that node which has been extended with network host mobility support
   capabilities as defined Mobile IPv6 in [1] and that may take special
   actions based on that (for
   instance as the ones defined in NEMO Basic Support [3]

3.16 MIPv6-enabled (MIPv6-node) that.

3.6  Correspondent Router (CR)

   A node which router topologically close to the CN that has been extended extented with host
   some mobility support capabilities as defined in [1] and that may take special actions
   based on that

3.17 Correspondent Node (CN)

   Any node that is communicating with one or more MNNs. A CN could
   either be located that.  Details of the capabilities do not matter in the fixed
   present documents.  The CR is said NEMO-enabled if such capabilities
   are defined for network or within the mobile network,
   and could be either fixed or mobile. mobility support.

4.  Nested Mobility Terms

   Nested mobility occurs when there are more than one level of
   mobility. A MNN
   mobility, i.e.  when a mobile networks acts as an Access Router (AR) access network and
   allows visiting nodes to get attached to it.  There are two cases of
   nested mobility:

   o  when the attaching node is a single node: VMN (see figure 4).  For
      instance, when a passenger carrying a mobile phone gets Internet
      access from the public access network deployed into a bus.

   o  when the attaching node is a router MR with nodes behind it, i.e.  a
      mobile network (see figure 5).  For instance, when a passenger
      carrying a PAN gets Internet access from the public access network
      deployed in the bus.

   For the second case, we introduce the following terms:

4.1  Nested Mobile Network (nested-NEMO)

   A mobile network is said to be nested when a mobile network
   (sub-NEMO) is getting attached to a larger mobile network. network
   (parent-NEMO).  The aggregated hierarchy of mobile networks becomes a
   single nested mobile network.

4.2  root-NEMO

   The mobile network at the top of the hierarchy connecting the
   aggregated nested mobile network to the Internet.

4.3  parent-NEMO

   The upstream mobile network providing Internet access to a another
   mobile network down the hierarchy.

4.4  sub-NEMO

   The downstream mobile network attached to a another mobile network up
   the hierarchy.  It becomes a subservient of the parent-NEMO.  The
   sub-NEMO is getting Internet access through the parent-NEMO and does
   not provide Internet access to the parent-NEMO.

4.5  root-MR (or TLMR, but depreciated)

   The MR(s) of the root-NEMO used to connect the nested mobile network
   to the fixed Internet.  Was referred to as "TMLR" (Top-Level Mobile
   Router) in former versions of this document.

4.6  parent-MR

   The MR(s) of the parent-NEMO.

4.7  sub-MR

   The MR(s) of the sub-NEMO connected to a parent-NEMO

               ________________________
              |                        |
              |                        |
              |       Internet         |
              |                        |
              |________________________|
                 __|_            __|_
                |    |  Access  |    |
                | AR |  Router  | AR |
                |____|          |____|
                             _____|_____________ home
                  |                        _|__   link
                  |                    |  |    |
                  |            _____   |__| MR | Mobile Router
                  |           |     |__|  |____|
                  ----------> | VMN |  |   __|_____________ NEMO-link 1
                              |_____|  |   __|__     __|__
                               _____   |  |     |   |     |
                              |     |__|  | LFN |   | LMN |
                              | LFN |  |  |_____|   |_____|
                              |_____|  |
                                       | NEMO-link 2

   Fig.4:

   Figure 5: Nested Mobility: single VMN attached to a mobile network
               ________________________
              |                        |
              |                        |
              |       Internet         |
              |                        |
              |________________________|
                 __|__           __|__
                |     |         |     |
                | AR1 |         | AR2 |
                |_____|         |_____|
                              _____|_____________ foreign
                                          __|__   link
                                         |     |
                          |
                                      _____   |__| MR1 | root-MR
                          |__|     |__|  |_____|
                          |  | MR2 |
                                  _  |   __|_____________ NEMO-link 1     |
                          _   |--|_|-|     |-|        _
                  _   |--|_|--|      |_____| |   __|__     __|__
                  _____   |           |  |     |   |  _  |-|_|
           _  |--|_|--|       |              |-|_|-|
          |_|-|       |                            |
              |

          MNN  sub-MR   |  | LFN |   | LMN |
                 | LFN |__|           |  |_____|   |_____|
                 |_____|  |           |
                          |           | NEMO-link 2

                 |-------------------| |---------------------------|  root-MR   AR            AR   HA

          <--------><------><-------><------><------------>
          sub-NEMO  root-NEMO

   Fig.5:   fl   Internet Home Network

    Figure 6: Nested Mobility: sub-NEMO attached to a larger mobile
                                network

5.  Multihoming Terms

   Multihoming, as currently defined by the IETF, covers
   site-multihoming [8] and host multihoming.  We enlarge this
   terminology to include "multihomed mobile router" and "multihomed
   mobile network".  The specific configurations and issues pertaining
   to multihomed mobile networks are coverd in [5].

5.1  Multihomed Host

   Within host-multihoming, a host may either be:

   o  multi-addressed: multiple source addresses to choose between on or MNN

   A host (e.g.  a
      given interface; all MNN) is multihomed when it has several IPv6 nodes are multi-addressed due to the
      presence of link-local addresses on all interfaces.

   o  multi-interfaced: multiple interfaces
   to choose between, on i.e.  in the
      same link or not.

   o  multi-linked: following cases when it is either:

      multi-prefixed: multiple links to choose between (just like
      multi-interfaced but all interfaces prefixes are NOT connected advertised on the link(s)
      the host is attached to, or.

      multi-interfaced: the host has multiple interfaces to choose
      between, on the same
      link)

   o  multi-sited: when using IPv6 site-local address and attached to
      different sites link or not.

5.2  Multihomed Mobile Router

   A MR

   From the definition of a multihomed host, it follows that a router is
   multihomed when it has simultaneously more than one active
   connection several IPv6 addresses to choose between, i.e.
   in the Internet, that is following cases when it is either:

   o  multi-egress-addressed MR: the MR has simultaneously is either:

      multi-prefixed: multiple
      active addresses to choose between prefixes are advertised on the link(s) a given
      MR's egress interface

   o  multi-egress-interfaced MR: is attached to, or.

      multi-interfaced: the MR has simultaneously multiple
      active egress interfaces to choose
      between, on the same link or not

   o  multi-egress-linked MR: the MR has simultaneously multiple active
      egress interfaces on distinct links

   o  multi-egress-sited MR: the MR is simultaneously attached to
      different sites (possible distinct ISPs).

               ________________________
              |                        |
              |                        |
              |        Internet        |
              |                        |
              |________________________|
                __|__            __|__
               |     |          |     |
               | AR1 | not.

                                   _____
                   _           _  | AR2     |
                  |_|-|  _  |-|_|-|     |-|        _
                   _  |-|_|=|     |_____|          |_____|
    foreign ______|_____      _____|______ foreign
    link 1          |    ____    |         link 2 |  _  |-|_|
                  |_|-|     |             |-|_|-|
                                                |   |
                    |___|
                  MNNs   MR |___|
                        |____|
                    ______|_____ NEMO-link
                          __|__
                         |     |
                         | LFN |
                         |_____|

   Fig.6: Multihomed Mobile Network:   AR  Internet   AR    HA

                   Figure 7: MR has with multiple egress interfaces E-faces

5.3  Multihomed Mobile Network (multihomed-NEMO)

   A mobile network is multihomed when there more than one active egress
   interface connected to the global Internet, that is when either:

   o either a MR is multihomed, multihomed or

   o  multi-MR-NEMO: the mobile network has more than one MR
   there are multiple MRs to choose
      between

               ________________________
              |                        |
              |                        |
              |        Internet        |
              |                        |
              |________________________|
                __|__            __|__
               |     |          |     |
               | AR1 |          | AR2 |
               |_____|          |_____|
    foreign ______|_____      _____|______ foreign
    link 1         __|__      __|__        link 2
                  | between, or multiple prefixes are
   advertised in the mobile network.

                        MR1
                         _  |
                   _  |-|_|-|  _____
                  |_|-|     |-|     |
             MNNs  _  |       | MR1     |-|        _
                  |_|-|  _  |-|_____| |  _  |-|_|
                      |-|_|-|         |-|_|-|
                            |               |
                        MR2 |
                  |_____|    |_____|
                _____|__________|_____

              Figure 8: Single NEMO-link
                          __|__
                         |     |
                         | LFN |
                         |_____|

   Fig.7: Multihomed Mobile Network: NEMO with multiple MRs

5.4 Multihomed and Nested Mobile Network

   A nested mobile network is multihomed when there are more than one
   active interface connected to the global Internet, that with Multiple MRs

5.4  Nested Multihomed Mobile Network

   A nested mobile network is multihomed when
   either:

   o either a root-MR is multihomed,
   multihomed or

   o  multi-rooted-NEMO: there are more than one root-MR multiple root-MRs to choose between or
   multiple prefixes are advertised in the nested mobile network.

5.5  Illustration

   Fig.6 and

   Figure 7 and Figure 8 show two examples of multihomed mobile
   networks. Fig.8.  Figure 9 shows two independent mobile networks.  NEMO-1 is
   single-homed to the Internet through MR1.  NEMO-2 is multihomed to
   the Internet through MR2a and MR2b.  Both mobile networks offer
   access to visiting nodes and networks through an AR.

   Let's consider the two following nested scenarios in Fig.8: Figure 9:

   Scenario 1: what happens when MR2a's egress interfaced is attached to
   AR1 ?

      *  NEMO-2 becomes a subservient of NEMO-11 NEMO-1

      *  NEMO-1 becomes the parent-NEMO for NEMO-2 and the root-NEMO for
         the aggregated nested mobile network

      *  NEMO-2 becomes the sub-NEMO

      *  MR1 is the root-MR for the aggregated nested mobile network

      *  MR2a is a sub-MR in the aggregated nested mobile network

      *  NEMO-2 is still multihomed to the Internet through AR1 and ARz

      *  The aggregated nested mobile network is not multihomed since
         NEMO-2 cannot be used as a transit network for NEMO-1

   Scenario 2: what happens when MR1's egress interface is attached to
   AR2 ?

      *  NEMO-1 becomes a subservient of NEMO-2

      *  NEMO-1 becomes the sub-NEMO

      *  NEMO-2 becomes the parent_NEMO for NEMO-1 and also the
         root-NEMO for the aggregated nested mobile network)

      *  MR2a and MR2b are both root-MRs for the aggregated nested
         mobile network

      *  MR1 is a sub-MR in the aggregated nested mobile network
      *  NEMO-1 is not multihomed

      *  The aggregated nested mobile network is multihomed

                   _____________________________
                  |                             |
                  |                             |
                  |         Internet            |
                  |                             |
                  |_____________________________|
                   __|__       __|__     __|__
                  |     |     |     |   |     |
                  | ARx |     | ARy |   | ARz |
                  |_____|     |_____|   |_____|
               ______|__     ____|____  ___|____
                __|__          __|___    __|___
               |     |        |      |  |      |
               | MR1 |        | MR2a |  | MR2b |
               |_____|        |______|  |______|
    NEMO-1   _____|____      ___|__________|___   NEMO-2
                __|__                __|__
               |     |              |     |
               | LFN | AR1          | LFN | AR2
               |_____|              |_____|

   Fig.8: Multihomed

               Figure 9: Nested Multihomed Mobile Network

6.  Home Network Model Terms

   The terms in this section are useful to describe the possible
   configurations of mobile networks are home.  The configurations are
   illustrated in [6]

6.1  Home Link

   The link attached to the interface at the Home Agent on which the
   Home Prefix is configured.  The interface can be a virtual interface,
   in which case the Home Link is a virtual Home Link.

6.2  Home Network

   The Network formed by the application of the Home Prefix on the Home
   Link.  With Nemo, the concept of Home Network is extended as
   explained below.

6.3  Home Address

   With Mobile IPv6, a Home Address is derived from the Home Network
   prefix.  This is generalized in Nemo, with some limitations: A Home
   Address can be either derived from the Home Network or from one of
   the Mobile Router's Mobile Network prefixes.

6.4  Mobile Home Network

   A Mobile Network that also serves as a Home Network.  The MR that
   owns the MNP acts as a Home Agent for it.

6.5  Distributed Home Network

   A Distributed Home Network is advertised by several sites that are
   geographically distributed and meshed using tunnels in a VPN fashion.

6.6  Mobile Aggregated Prefix

   An aggregation of Mobile Network Prefixes.

6..7  Aggregated Home Network

   The Home Network associated with a Mobile Aggregated Prefix.  This
   Aggregation is advertised as a subnet on the Home Link, and thus used
   as Home Network for Nemo purposes.

6.8  Extended Home Network

   The network associated with the aggregation of one or more Home
   Network(s) and Mobile Network(s).  As opposed to the Mobile IPv6 Home
   Network

6. that is a subnet, the extended Home Network is an aggregation
   and is further subnetted.

6.9  Virtual Home Network

   The Home Network associated with a Virtual Network.  The Extended
   Home Network and the Aggregated Home Network can be configured as
   Virtual Home Network.

7.  Mobility Support Terms

6.1

7.1  Host mobility support Mobility Support

   Host Mobility Support is a mechanism which maintains session
   continuity between mobile nodes and their correspondents upon the
   mobile host's change of point of attachment.  It could can be achieved by
   using Mobile IPv6.

6.2 IPv6 or other mobility support mechanisms.

7.2  Network Mobility support Support (NEMO Support)

   Network Mobility Support is a mechanism which maintains session
   continuity between mobile network nodes and their correspondent upon
   a mobile router's change of point of attachment.  Solutions for this
   problem are classified into NEMO Basic Support, and NEMO Extended
   Support.

6.3

7.3  NEMO Basic Support

   NEMO Basic Support is a solution to preserve session continuity by
   means of bidirectional tunneling between MRs and their HAs much like
   what is done using with [1] for mobile nodes. nodes when Routing Optimization is
   not used.  Only the HA and the MR are NEMO-enabled.  The solution for
   doing this is solely specified in [3].

6.4 NEMO Extended Support

   NEMO Extended support is to provide the necessary optimization,
   including routing optimization between arbitrary MNNs and CNs.

7. New Text From Usage Draft

   The text in this section is taken from [5] and is subject to
   discussion on the mailing list.

7.1 Home Link

   The link attached to the interface at the Home Agent on which the
   Home Prefix is configured. The interface can be a virtual interface,
   in which case the Home Link is a virtual Home Link.

7.2 Home Network

   The Network formed by the application of the Home Prefix on the Home
   Link. With Nemo, the concept of Home Network is extended as explained
   below.

7.3 Home Address

   With Mobile IPv6, a Home Address is derived from the Home Network
   prefix.  This is generalized in Nemo, with some limitations: A Home
   Address can be either derived from the Home Network or from one of
   the Mobile Router's Mobile Network prefixes. [2].

7.4  NEMO Extended Support

   NEMO Extended support is to provide the necessary optimization,
   including routing optimization between arbitrary MNNs and CNs.

7.5  MRHA Tunnel

   The bi-directional tunnel between a Mobile Router and its Home Agent

7.5 Mobile Aggregated Prefix

   An aggregation of Mobile Network Prefixes.

7.6 Aggregated Home Network
   The Home Network associated with a Mobile Aggregated Prefix. This
   Aggregation is advertised as a subnet on the Home Link, and thus used
   as Home Network for Nemo purposes.

7.7 Extended Home Network

   The network associated with the aggregation of one or more Home
   Network(s) and Mobile Network(s). As opposed to the Mobile IPv6 Home
   Network that is a subnet, the extended Home Network is an aggregation
   and is further subnetted.

7.8 Virtual Home Network

   The Home Network associated with a Virtual Network. The Extended Home
   Network and the Aggregated Home Network can be configured as Virtual
   Home Network.

8.

8..  Miscellaneous Terms

8.1  Idle MNN

   A MNN that does not engage in any communication.

8.2  Idle Mobile Network

   A mobile network that does not engage in any communication outside
   the network may can be considered idle from the global Internet.  This
   doesn't preclude imply that MNNs are themselves idle.  Internal traffic
   between any two MNNs located in the same mobile network is not
   concerned by this statement.

9.  Changes since draft-nemo-terminology-01.txt

   - Shorten abstract.

   - Reshaped some figures.

   - LFN, VMN, LMN: said that the node is able/unable to move while
   maintaining/not maintaining ongoing sessions.  Text already
   appareared in the document, but not in the definition itself.

   - NEMO-enabled: said that MR and HA are the only NEMO-enabled nodes
   in NEMO Basic Support

   - Removed "NEMO-enabled MR" as this definition is self-contained into
   "NEMO-enabled Node"

   - Rephrased the definition of "multihomed host", "multihomed router",
   "multihomed mobile network" and removed the terms multi-addressed and
   multi-sited, multi-rooted-NEMO, etc.  Such terms were not so useful,
   and somewhat too long.

   - Added the case "multiple MNPs are advertised" to the definition of
   mobile network

   - Copy-pasted terms defined from RFC 3753 so that the document is
   self-contained

   - Updated References

   - Added new term "Correspondent Router"

   - Permanently removed NEMO-Prefix.  Only MNP will be used

   - Added terms "Mobile Home Network" and "Distributed Home Network" in
   the Home Network Model section.  These 2 terms were provided by
   Pascal Thubert on July 30th 2004

10.  Changes since draft-nemo-terminology-00.txt

   - NEMO will be used either as the concept for NEtwork MObility and a
   noun meaning "NEtwork that is MObile"

   - Added TMLR as depreciated term (everyone should use root-MR
   instead)

   - Added NEMO-prefix "NEtwork that is MObile"

   - Added NEMO-link Deprecated TMLR and MONET.

   - Added NEMO-prefix, NEMO-link, NEMO-enabled MR MR.

   - Precision that IP address of LFN, LMN, or VMN is taken from a
   NEMO-prefix MNP
   - Added abbreviation E-face (Egress interface) and I-face (Ingress
   interface)

   - Some re-ordering of terms, and a few typos.

   - Added some text from the usage draft [5]

10. draft-thubert-usages (now home
   network model draft-ietf-nemo-home-network-models)

11.  Acknowledgments

   The material presented in this document takes most of the text from
   our
   former internet-drafts submitted to the former MobileIP WG and to the former
   MONET BOF.  Authors would therefore like to thank both Motorola Labs
   Paris and INRIA (PLANETE team, Grenoble, France), France) where this
   terminology originated, for the opportunity to bring this terminology it to the IETF,
   and particularly Claude Castelluccia (INRIA) for his advices, suggestions,
   and direction, Alexandru Petrescu (Motorola) and Christophe Janneteau (Motorola). Janneteau.  We also
   acknowledge the input from Hesham Soliman (Ericsson), Soliman, Mattias
   Petterson (Ericsson), Petterson, Marcelo
   Bagnulo and numerous other people from the NEMO Working
   Group Group.  The
   Home Network Model section is contributed by Pascal Thubert, Ryuji
   Wakikawa and Vijay Devaparalli.

12  References

   [1]  Johnson, D., Perkins, C. and J. Arkko, "Mobility Support in
        IPv6", draft-ietf-mobileip-ipv6-24 (work in progress), July
        2003. RFC 3775, June 2004.

   [2]  Manner, J. and M. Kojo, "Mobility Related Terminology",
        draft-ietf-seamoby-terminology-04 (work in progress), April
        2003.

   [3]  Devarapalli, V., "Network Mobility (NEMO) Basic Support
        Protocol",
        draft-ietf-nemo-basic-support-02 draft-ietf-nemo-basic-support-03 (work in progress), December
        2003.
        June 2004.

   [3]  Manner, J. and M. Kojo, "Mobility Related Terminology", RFC
        3753, June 2004.

   [4]  Ernst, T., "Network Mobility Support Goals and Requirements",
        draft-ietf-nemo-requirements-02
        draft-ietf-nemo-requirements-03 (work in progress), February October
        2004.

   [5]  Ng, C-W., Paik, E-K. and T. Ernst, "Analysis of Multihoming in
        Network Mobility Support", draft-ietf-nemo-multihoming-issues-01
        (work in progress), October 2004.

   [6]  Thubert, P., Wakikawa, R. and V. Devarapalli, "Examples of Basic
        NEMO Usage", draft-thubert-nemo-basic-usages "NEMO Home Network
        Models", draft-ietf-nemo-home-network-models-01 (work in
        progress),
        February 2004.

   [6]  Perkins, C., "IP Mobility support", IETF RFC 2002, October 1996. 2004.

   [7]  Deering, S. and R. Hinden, "Internet Protocol Version 6 (IPv6)",
        IETF RFC 2460, December 1998.

   [8]  Abley, J., Black, B. and V. Gill, "Goals for IPv6
        Site-Multihoming Architectures", IETF RFC 3582, August 2003.

Authors' Addresses

   Ernst

   Thierry Ernst
   WIDE at Keio University
   Jun Murai Lab., Keio University.
   K-square Town Campus, 1488-8 Ogura, Saiwa-Ku
   Kawasaki, Kanagawa  212-0054
   Japan

   Phone: +81-44-580-1600
   Fax:   +81-44-580-1437
   EMail: ernst@sfc.wide.ad.jp
   URI:   http://www.sfc.wide.ad.jp/~ernst/

   Hong-Yon Lach
   Motorola Labs Paris
   Espace Technologique - Saint Aubin
   Gif-sur-Yvette Cedex,   91 193
   France

   Phone: +33-169-35-25-36
   Fax:
   EMail: hong-yon.lach@motorola.com
   URI:

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