ISO 21210:2012

INTERNATIONAL ISO
STANDARD 21210
First edition
2012-06-15

Intelligent transport systems —
Communications access for land mobiles
(CALM) — IPv6 Networking
Systèmes intelligents de transport — Accès aux communications des
services mobiles terrestres (CALM) — Gestion de réseau IPv6




Reference number
ISO 21210:2012(E)
©
ISO 2012

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ISO 21210:2012(E)

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ISO 21210:2012(E)
Contents Page
Foreword . iv
Introduction . v
1  Scope . 1
2  Conformance . 1
3  Normative references . 1
4  Terms and definitions . 2
5  Symbols and abbreviated terms . 6
6  Requirements . 7
Annex A (informative) Illustration of mobility support . 19
Bibliography . 22

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ISO 21210:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 21210 was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.

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ISO 21210:2012(E)
Introduction
This International Standard is part of a family of International Standards based on the communications access
for land mobiles (CALM) concept. These International Standards specify a common architecture network
protocols and communication interface definitions for wired and wireless communications using various
access technologies including cellular 2nd generation, cellular 3rd generation, satellite, infra-red, 5 GHz
microwave, 60 GHz millimetre-wave and mobile wireless broadband. These and other access technologies
that can be incorporated are designed to provide broadcast, unicast and multicast communications between
mobile stations, between mobile and fixed stations and between fixed stations in the intelligent transport
systems (ITS) sector.
A fundamental advantage of the CALM concept over traditional systems is that applications are abstracted
from the access technologies that provide the wireless connectivity and the networks that transport the
information from the source to the destination(s). This means that ITS stations are not limited to a single
access technology and networking protocol and can implement any of those supported, and the ITS station
management can make optimal use of all these resources. To exploit this flexibility, CALM-compliant systems
can support handover of different types including
 those involving a change of communication interface without a change of access technology;
 those involving a change of communication interface with a change of access technology;
 those involving reconfiguration or change of the network employed to provide connectivity;
 those involving both a change in communication interface and network reconfiguration.
An introduction to the whole set of International Standards is provided in ISO 21217.
One of the most interesting features of the CALM concept is the ability to use a number of networking
protocols designed to meet specific requirements. However, to meet the needs of the majority of anticipated
ITS applications and services, IPv6 ('Internet Protocol version 6') is ideally suited. The use of this version of IP
scales is to meet the needs of a growing number of vehicles and connected devices, and provides the added
functionality necessary in mobile environments [IPv6 mobility support (NEMO), “multiple Care-of Address”
(MCoA) support].
This International Standard specifies the IPv6 network protocols and services necessary to support global
reachability of ITS stations, continuous Internet connectivity for ITS stations and the handover functionality
required to maintain such connectivity. This functionality also allows legacy devices to effectively use an ITS
station as an access router to connect to the Internet. Essentially, this specification describes how IPv6 is
configured to support ITS stations and provides the necessary management functionality.

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INTERNATIONAL STANDARD ISO 21210:2012(E)

Intelligent transport systems — Communications access for
land mobiles (CALM) — IPv6 Networking
1 Scope
This International Standard specifies networking protocol functionalities related to IPv6 networking between
two or more ITS stations communicating over the global Internet communication network.
The International Standard assumes that the reader is familiar with IETF specifications found in "Request for
Comments" (RFCs) of individual IPv6 protocol blocks used within this International Standard. This
International Standard does not define a new protocol, a new exchange of messages at the IPv6 layer, or
new data structures. It defines how standard IETF protocols are combined so that ITS stations can
communicate with one another using the IPv6 family of protocols. Procedures defined to share information
between the IPv6 layer and other components of the ITS station architecture are defined in ISO 24102. In
addition to the requirements specified within this International Standard, a number of notes and examples are
provided to illustrate IPv6 addressing configuration and IPv6 mobility management.
2 Conformance
This International Standard specifies the use of IPv6 networking for ITS stations conforming to the CALM
architecture (ISO 21217). A set of protocols specified by the IETF are selected. At minimum, all
implementations of IPv6 in the context of ITS stations have to conform with IETF RFC 4294 IPv6 Node
Requirements.
"Protocol implementation conformance statements" (PICS) will be provided at a later stage in a later
document and will complement the IPv6 conformance tests such as those defined for the IPv6-ready logo
program (http://www.ipv6ready.org). The IPv6-ready logo program provides conformance tests for individual
IPv6 protocols or sets of IPv6 protocols on an individual protocol basis.
3 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 21217:2010, Intelligent transport systems — Communications access for land mobiles (CALM) —
Architecture
ISO 21218, Intelligent transport systems — Communications access for land mobiles (CALM) — Medium
service access points
ISO 24102, Intelligent transport systems — Communications access for land mobiles (CALM) — Management
IETF Request for Comments (RFC) 2460, Internet Protocol, Version 6 (IPv6) Specification
IETF Request for Comments (RFC) 3587, IPv6 Global Unicast Address Format
IETF Request for Comments (RFC) 3963, Network Mobility (NEMO) Basic Support Protocol
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ISO 21210:2012(E)
IETF Request for Comments (RFC) 4291, IP Version 6 Addressing Architecture
IETF Request for Comments (RFC) 4294, IPv6 Node Requirements
IETF Request for Comments (RFC) 4493, The AES-CMAC Aligorithm
IETF Request for Comments (RFC) 4861, Neighbor Discovery for IP Version 6 (IPv6)
IETF Request for Comments (RFC) 4862, IPv6 Stateless Address Autoconfiguration
IETF Request for Comments (RFC) 5648, Multiple Care-of Addresses Registration
4 Terms and definitions
For the purposes of this document, the terms and definitions in ISO 21217, ISO 21218 and ISO 24102 and the
following apply.
NOTE Wherever terms like "address", "host", "node", "router", "mobile network", "interface", "link" and "subnet", are
used in the text without the IPv6 modifier, the IPv6 modifier should be assumed to be present (e.g. IPv6 address, IPv6
interface). Most of the definitions are taken from RFC 2460; RFC 3753 and RFC 4885.
4.1
care-of address
CoA
'IPv6 address' associated with a mobile node while attached on a 'foreign IPv6 link'
4.2
egress IPv6 interface
interface of an MR attached to the 'home IPv6 link' if the 'IPv6 mobile router' is at home, or attached to a
'foreign IPv6 link' if the 'IPv6 mobile router' is in a foreign network
[SOURCE: RFC 3753]
4.3
external IPv6 interface
'IPv6 interface' of an 'ITS-S IPv6 router' in an ITS station used to connect to another ITS station or the Internet
4.4
foreign IPv6 link
'IPv6 link' other than the mobile node's 'home IPv6 link'
4.5
global IPv6 address
'IPv6 address' corresponding to 'Global Unicast Addresses' as specified in RFC 4291
4.6
home address
HoA
'IPv6 address' assigned to a mobile node, used as the permanent address of the mobile node
NOTE The term 'home address' is defined in RFC 3753. This 'IPv6 address' is within the mobile node's 'home IPv6
link'. Standard IP routing mechanisms deliver packets destined for a mobile node's 'home address' to its 'home IPv6 link'.
4.7
home IPv6 link
'IPv6 link' on which a mobile node's 'home IPv6 prefix' is defined
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ISO 21210:2012(E)
4.8
home IPv6 prefix
'IPv6 prefix' corresponding to a mobile node's 'home address'
4.9
ingress IPv6 interface
interface of an MR attached to an 'IPv6 link' inside the 'IPv6 mobile network'
[SOURCE: RFC 3753]
4.10
home ITS-S IPv6 LAN
'ITS-S IPv6 LAN' providing Internet reachability functions to 'mobile ITS-S IPv6 LANs'
4.11
IPv6 subnet
logical group of connected network nodes
NOTE Nodes in an 'IPv6 subnet' share a common network prefix.
[SOURCE: RFC 3753]
4.12
IPv6 Access Network
AN
'IP network that includes one or more Access Network Routers'
[SOURCE: RFC 3753]
4.13
IPv6 access router
AR
'Access Network Router residing on the edge of an Access Network and connected to one or more Access
Points'
NOTE This definition of "access router" is taken from RFC 3753. An 'IPv6 Access Router' offers IP connectivity to
Mobile Nodes, acting as a default IPv6 router to the mobile nodes it is currently serving. The 'IPv6 Access Router' may
include intelligence beyond a simple forwarding service offered by ordinary IPv6 routers.
4.14
IPv6 address
IPv6-layer identifier for an interface or a set of interfaces
NOTE IPv6 addresses are assigned to network interfaces, not to nodes.
[SOURCE: RFC 2460]
4.15
IPv6 home agent
HA
'IPv6 router' on a mobile node's 'home IPv6 link' with which the mobile node (MN) has registered its current
Care-of Address.
NOTE This definition of 'home agent' is taken from RFC 3753. While the mobile node is away from home, the home
agent intercepts packets on the 'home IPv6 link' destined to the mobile node's Home Address (HoA), encapsulates them,
and tunnels them to the mobile node's registered Care-of Address (CoA).
4.16
IPv6 host
any 'IPv6 node' that is not a 'IPv6 router'
[SOURCE: RFC 2460]
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ISO 21210:2012(E)
4.17
IPv6 interface
node's attachment to an 'IPv6 link'
NOTE Each interface is configured with at least one link-local address and possibly other types of IPv6 addresses
(global unicast, multicast).
[SOURCE: RFC 2460]
4.18
IPv6 link
communication facility or medium over which nodes can communicate at the link layer, i.e. the layer
immediately below IPv6
NOTE A link is the layer immediately below IP. In a layered network stack model, the Link Layer (Layer 2) is normally
below the Network (IP) Layer (Layer 3), and above the Physical Layer. Examples are Ethernet (simple or bridged; PPP
links; X.25, Frame Relay, or ATM networks; and IP (or higher) layer 'tunnels', such as tunnels over IPv4 or IPv6 itself.
[SOURCE: RFC 2460]
4.19
IPv6 mobile network
entire network, moving as a unit, which dynamically changes its point of attachment to the Internet and thus its
reachability in the topology
NOTE This definition of 'mobile network' is taken from RFC 3753.
4.20
IPv6 mobile router
MR
'IPv6 router' capable of changing its point of attachment to the network, moving from one 'IPv6 link' to another
'IPv6 link'
NOTE The mobile IPv6 router is capable of forwarding packets between two or more interfaces, and possibly running
a dynamic routing protocol modifying the state by which it does packet forwarding. A mobile IPv6 router acting as a
gateway between an entire IPv6 mobile 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 the rest of the Internet are transmitted through an egress
interface; packets forwarded downstream to the IPv6 mobile network are transmitted through an ingress interface
(RFC 3753).
4.21
IPv6 node
device that implements IPv6
[SOURCE: RFC 2460]
4.22
IPv6 prefix
bit string that consists of some number of initial bits of an 'IPv6 address'
NOTE The prefix of length 64 (/64) of an IPv6 'Global Unicast Address' (RFC 3587) identifies a specific IPv6 subnet
and its position in the Internet hierarchy
[SOURCE: RFC 3753]
4.23
IPv6 router
'IPv6 node' that forwards IPv6 packets not explicitly IPv6 addressed to itself
[SOURCE: RFC 2460]
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ISO 21210:2012(E)
4.24
'ITS-S IPv6 access router'
'IPv6 router' implementing communication functions of an ITS station and offering access to 'mobile ITS-S
IPv6 LANs'
4.25
'ITS-S IPv6 border router'
IPv6 router implementing communication functions of an ITS station and connecting 'ITS-S IPv6 LANs' to the
Internet and other networks
4.26
ITS-S IPv6 home agent
'IPv6 home agent' implementing communication functions of an ITS station and maintaining access to 'mobile
ITS-S IPv6 LANs'
4.27
ITS-S IPv6 host
'IPv6 host' implementing non-routing capabilities of an ITS station
4.28
ITS-S IPv6 LAN
IPv6 LAN composed of one or more IPv6 subnets comprising one or more ITS station(s) and 0 or more
legacy IPv6 node(s) deployed in an ITS sub-system
NOTE An 'ITS-S IPv6 router' with no 'ITS-S IPv6 LAN interface' is considered as a simple case of an 'ITS-S IPv6
LAN' comprising only one 'IPv6 node'. Considering only 'ITS-S IPv6 LANs' simplifies this International Standard and
ensures compatibility among ITS sub-systems equipped to meet different design choices.
4.29
ITS-S IPv6 LAN interface
'IPv6 interface' of an 'IPv6 node' in an ITS station used to connect to the 'ITS-S IPv6 LAN'
NOTE All 'IPv6 interfaces' are either 'external IPv6 interfaces' or 'ITS-S IPv6 LAN interfaces'.
4.30
ITS-S IPv6 LAN node
node on an 'ITS-S IPv6 LANITS-S IPv6 LAN'
NOTE Any 'ITS-S IPv6 node' or 'legacy IPv6 node'.
4.31
'ITS-S IPv6 mobile router'
'IPv6 router' implementing communication functions of an ITS station and deployed in a 'mobile ITS-S IPv6
LAN'
4.32
ITS-S IPv6 node
'IPv6 node' ('IPv6 host' or 'IPv6 router') implementing functions of an ITS station
NOTE The ITS station comprises a communication function and application functions. These functions may be split
into physically separated nodes communicating over an LAN.
4.33
ITS-S IPv6 router
'IPv6 router' implementing routing capabilities of an ITS station
4.34
ITS-S IPv6 router serving an ITS-S IPv6 LAN
'ITS-S IPv6 router' that is connecting an 'ITS IPv6 LAN' to other 'ITS IPv6 LANs' or the global Internet
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ISO 21210:2012(E)
4.35
legacy IPv6 node
'IPv6 node' in accordance with RFC 4294 (IPv6 node requirements) and functions without additional IPv6
networking capabilities
4.36
link-local IPv6 address
'IPv6 address' corresponding to a 'link-local IPv6 unicast address' as specified in RFC 4291
4.37
mobile edge multihoming
possibility for a mobile node ('IPv6 host' or 'IPv6 router' serving an 'IPv6 mobile network') to connect
simultaneously to the Internet through multiple points of attachment, either using multiple communication
media or using multiple interfaces of the same communication medium, or through multiple 'IPv6 mobile
routers' serving the same 'IPv6 mobile network'
NOTE Mobile edge multihoming mechanisms are known as MonAmi6 support within the IETF as a reference to the
former MonAmi6 Working Group where these mechanisms were first defined before being taken over by the MeXT
Working Group. For a comprehensive understanding of the mobile edge multihoming issues, it is recommended that the
user read RFC 4980.
4.38
mobile ITS-S IPv6 LAN
'ITS-S IPv6 LAN' having the capability of changing its point of attachment to the ITS domain or the Internet
4.39
mobile ITS-S IPv6 LAN node
'IPv6 node' on a 'mobile ITS-S IPv6 LAN'
4.40
network mobility support
network function allowing an entire mobile 'IPv6 subnet' or 'IPv6 mobile network' to change its point of
attachment to the Internet and, thus, its reachability in the topology, without interrupting IP packet delivery to
or from this 'IPv6 mobile network'
NOTE This terminology associated with this support function is defined in RFC 3753 and RFC 4885.
4.41
tunnel
forwarding path between two nodes on which the payload consists of encapsulated packets
5 Symbols and abbreviated terms
Symbols and abbreviated terms used in this International Standard are listed below. Reference should also be
made to ISO 21217, ISO 21218, ISO 24102, IETF RFC 3753 and IETF RFC 4885.
AR IPv6 access router
BR IPv6 border router
CoA IPv6 'Care-of Address'
DHCP Dynamic Host Configuration Protocol
DNS Dynamic Name Server
HA IPv6 home agent
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ISO 21210:2012(E)
HoA IPv6 home address
IETF Internet Engineering Task Force
IP Internet Protocol
IPsec Internet Protocol security
ITS-S ITS station
L2TP Layer Two Tunneling
LAN Local Area Network
MCoA Multiple Care-of Addresses
MIB Management Information Base
MNN IPv6 mobile network node (by extension an abbreviation for 'mobile ITS-S IPv6 LAN nodes')
MNP IPv6 mobile network prefix
MR IPv6 mobile router
NEMO NEtwork Mobility
6 Requirements
6.1 Categories
Clause 6 explains the relation between the five categories of requirements.
 The first category (see 6.2) contains requirements applying to all IPv6 nodes and requirements applying
to different types of IPv6 nodes in each ITS sub-system.
 The second category (see 6.3) contains requirements defining the IPv6 functional modules that are
particular to 'ITS-S IPv6 nodes'. Five different modules are detailed. They may be combined in different
ways according to the functions of the IPv6 nodes defined in 6.2. How they are combined is the purpose
of the third category (see 6.4).
 The third category (see 6.4) contains requirements defining which of the IPv6 functional modules
specified in 6.3 are combined for each particular 'ITS-S IPv6 node' specified in 6.2.
 The fourth category (see 6.5) contains IPv6 addressing requirements applying to 'ITS-S IPv6 nodes'
according to the functions listed in 6.2.
 The fifth category (see 6.6) contains optional features and functions. Their actual specification is not
within the scope of this International Standard.
6.2 ITS-S nodes implementing IPv6
Figure 1 provides an illustration of the connectivity of ITS stations in IPv6-based ITS sub-systems and their
peer-to-peer relationship.
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ISO 21210:2012(E)

Figure 1 — Illustration of ITS station connectivity in IPv6-based ITS sub-systems
6.2.1 Requirements on all ITS-S IPv6 LAN nodes
This subclause specifies the functional requirements of any instantiation of an ITS station capable of
supporting communication classes 3, 4, 7 or 8 as specified in ISO 21217. An IPv6 local area network in an ITS
station implemented according to these specifications is referred to as an 'ITS-S IPv6 LAN'. 'ITS-S IPv6 LAN'
are components of various ITS sub-systems as illustrated in Figure 1.
An 'ITS-S IPv6 LAN node' shall implement IPv6 in accordance with IETF RFC 2460, RFC 4291, RFC 4493,
RFC 4861 and RFC 4294.
NOTE 1 Additional features are required according to the role played by the 'ITS-S IPv6 LAN node' (ITS-S IPv6 mobile
router, ITS-S IPv6 access router, ITS-S IPv6 border router, ITS-S IPv6 home agent, ITS-S IPv6 host) and whether it is
deployed in the vehicle ('mobile ITS-S IPv6 LAN'), in the roadside or in the central ITS sub-systems.
'ITS-S IPv6 LANs' deployed in vehicles, roadside, personal and central ITS stations shall be part of the global
public Internet.
'ITS-S IPv6 LANs' shall all be IPv6 islands inter-connected over the public Internet either using native IPv6, or
tunneled in IPv4 networks or some combination of both.
Transition mechanisms may be deployed so that IPv6 entities can also communicate with public Internet
entities not able yet to communicate in IPv6.
NOTE 2 Being part of the global Internet, IPv6 nodes deployed in 'ITS-S IPv6 LANs' can communicate with IPv6 third
parties not located in 'ITS-S IPv6 LANs'. It is necessary that IPv6 in ITS stations be backward compatible with all legacy
IPv6 nodes connected to the ITS station, either in the 'ITS-S IPv6 LAN' or anywhere in the Internet.
The functions of an ITS station may be distributed among various nodes on an ITS-S IPv6 LAN. There shall
be at least one 'ITS-S IPv6 router' on the 'ITS-S IPv6 LAN'.
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ISO 21210:2012(E)
An 'ITS-S IPv6 router' shall have at least one external IPv6 interface.
An 'ITS-S IPv6 router' may have an ITS LAN IPv6 interface. In such a situation, the ITS-S IPv6 router is said
to be an 'ITS-S IPv6 router serving an ITS-S IPv6 LAN'.
An 'ITS-S IPv6 router serving an ITS-S IPv6 LAN' may provide means for legacy IPv6 nodes deployed in its
attached 'ITS-S IPv6 LAN' to connect to the Internet.
An 'ITS-S IPv6 host' deployed in an 'ITS-S IPv6 LAN' shall implement the modules of an 'ITS-S IPv6 host' as
indicated in 6.4.2.
NOTE 3 If desired in a particular implementation, the functions of the ITS-S IPv6 host can be performed by an 'ITS-S
IPv6 router'.
An 'ITS-S IPv6 border router' deployed in an 'ITS-S IPv6 LAN' and connected to the Internet shall implement
the modules of an 'ITS-S IPv6 border router' in accordance with 6.4.5.
NOTE 4 The functions of the 'ITS-S IPv6 border router' can be performed by an 'ITS-S IPv6 access router' and the
functions of an ITS-S IPv6 host can be performed by an 'ITS-S IPv6 router'.
NOTE 5 An 'ITS-S gateway' deployed in an 'ITS-S IPv6 LAN' and acting as a firewall isolating non-IPv6 devices from
other devices reachable over IPv6 can be implemented as an 'ITS-S IPv6 IPv6 host' (in accordance with 6.4.2) or as an
'ITS-S IPv6 router' (in accordance with 6.4.1, 6.4.3 or 6.4.5).
6.2.2 ITS-S IPv6 LAN nodes deployed in vehicle ITS sub-systems
In addition to 6.2.1, which applies to all ITS sub-systems, the provisions of 6.2.2 apply to vehicle ITS sub-
systems. Figure 1 illustrates 'ITS-S IPv6 LAN nodes' deployed in the vehicle ITS sub-systems.
A vehicle ITS station capable of supporting communication classes 3, 4, 7 or 8 as specified in ISO 21217 shall
comprise a 'mobile ITS-S IPv6 LAN'.
An 'ITS-S IPv6 router' deployed in a 'mobile ITS-S IPv6 LAN' and used to attach to a foreign 'ITS-S IPv6 LAN'
shall implement the modules of an 'ITS-S IPv6 mobile router' as specified in 6.4.1.
A 'mobile ITS-S IPv6 LAN' shall at least contain one 'ITS-S IPv6 mobile router'.
NOTE The configuration of 'mobile ITS-S IPv6 LANs' with several 'ITS-S IPv6 mobile routers' can require additional
mechanisms that are not specified in this International Standard.
6.2.3 ITS-S IPv6 LAN nodes deployed in roadside ITS sub-systems
In addition to 6.2.1 which applies to all ITS sub-systems, the provisions in 6.2.3 apply to roadside ITS sub-
systems. Figure 1 illustrates 'ITS-S IPv6 LAN nodes' deployed in the roadside ITS sub-systems.
A roadside ITS station may contain one or more IPv6 routers, referred to as 'ITS-S IPv6 routers', to access the
Internet and to provide access to vehicle ITS sub-systems.
 An 'ITS-S router' deployed in an 'ITS-S IPv6 LAN' and used to provide access to 'mobile ITS-S IPv6 LAN'
shall implement the modules of an 'ITS-S IPv6 access router' in accordance with 6.4.3.
 An 'ITS-S IPv6 router' deployed in an 'ITS-S IPv6 LAN' and used to connect the roadside 'ITS-S IPv6
LAN' to the Internet shall implement the modules of an 'ITS-S IPv6 border router' in accordance with 6.4.4.
6.2.4 ITS-S IPv6 LAN nodes deployed in central ITS sub-systems
In addition to 6.2.1, which applies to all ITS sub-systems, the provisions of 6.2.4 apply to central ITS sub-
systems. Figure 1 illustrates 'ITS-S IPv6 LAN nodes' deployed in the central ITS sub-systems.
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ISO 21210:2012(E)
An 'ITS-S IPv6 router' deployed in an 'ITS-S IPv6 LAN' and used to connect the central 'ITS-S IPv6 LAN' to
the Internet shall implement the modules of an 'ITS-S IPv6 border router' in accordance with 6.4.4.
A central ITS station supporting communication classes 3, 4, 7 and 8 as defined in ISO 21217 shall implement
a 'home ITS-S IPv6 LAN' that implements the IPv6 host functions necessary for 'mobile ITS-S IPv6 LANs' to
maintain their reachability at a global IPv6 address. Functions that shall be provided by the 'home ITS-S IPv6
LAN' include IPv6 prefix allocation and domain name registration.
For communication classes 4 and 8 as defined in ISO 21217, 'ITS-S routers' deployed in the 'home ITS-S
IPv6 LAN' used to perform the functions necessary for 'mobile ITS-S IPv6 LANs' to maintain session continuity
while performing handovers, shall implement the modules of an 'ITS-S IPv6 home agent' in accordance with
6.4.4.
NOTE The functions of the IPv6 home agent can be implemented as a legacy IPv6 node.
6.2.5 ITS-S IPv6 LAN nodes deployed in personal ITS sub-systems
The provisions of 6.2.1 apply to all personal ITS subsystems.
NOTE While not specified in this International Standard, future versions will specify how nomadic devices are
attached to and integrated in ITS stations.
6.3 IPv6 functional modules
This subclause specifies what IPv6 functions it is required to use. These functions are put together in five
different modules. In 6.4, then, is specified which of these modules are required for each type of ITS-S IPv6
node specified in 6.2. This separation into modules makes the specification of IPv6 functions much easier.
Figure 2 illustrates how these functional modules are mapped to the IPv6 networking
...