ISO/IEC 8473-1:1994/Amd 3:1996

INTERNATIONAL
ISO/IEC
STANDARD
8473-l
First edition
1994-07-I 5
AMENDMENT 3
1996-l 2-l 5
Information technology - Protocol for
providing the connectionless-mode
network service: Protocol specification
AMENDMENT 3: Record Route Timestamps
Technologies de /‘information - Protocole assurant le service rbseau en
mode sans connexion: Spbcifica tion du pro tocole
AMENDEMENT 3: Enregistrement des temps
Reference number
GO/I EC 8473-l : 1994/Amd.3: 1996(E)

ISWIEC 8473-l: 1994/Amd.3: 1996(E)
Contents
Page
Subclause 6.15 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .~.
1)
Subclause 7.5.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2)
0 ISO/IEC 1996
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ii
0 ISO/IEC ISO/IEC 8473-l: 1994/Amd.3: 1996(E)
Foreword
IS0 (the International Organization for Standardization) and IEC (the Inter-
national Electrotechnical Commission) form the specialized system for worldwide
standardization. National bodies that are members of IS0 or IEC participate in the
development of International Standards through technical committees established
by the respective organization to deal with particular fields of technical activity.
IS0 and IEC technical committees collaborate in fields of mutual interest. Other
international organizations, governmental and non-governmental, in liaison with
IS0 and IEC, also take part in the work.
In the field of information technology, IS0 and IEC have established a joint
technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the
joint technical committee are circulated to national bodies for voting. Publication
as an International Standard requires approval by at least 75 % of the national
bodies casting a vote.
Amendment 3 to International Standard ISO/IEC 8473-l: 1994 was prepared by
Joint Technical Committee ISO/IEC JTC 1, Information technology, Sub-
committee SC 6, Telecommunications and information exchange between systems,
in collaboration with ITU-T. The identical text is published as ITU-T Rec.
X.233/Amd.3.
. . .
Ill
ISO/IEC 8473-l: 1994/Amd.3: 1996(E)
0 ISO/IEC
Introduction
This amendment to ITU-T Rec. X.233 I ISO/IEC 8473-l adds features to the protocol that support record route
the ability to associate a timestamp with each Network Entity Title in the “recording of route” option.
timestamps -
iv
ISO/IEC 8473-l : 1994lAmd.3 : 1996 (E)
INTERNATIONAL STANDARD
ITU-T RECOMMENDATION
INFORMATION TECHNOLOGY - PROTOCOL FOR PROVIDING
THE CONNECTIONLESS-MODE NETWORK SERVICE:
PROTOCOL SPECIFICATION
AMENDMENT 3
Record Route Timestamps
Subclause 6.15
1)
Replace the text of 6.15, in its entirety, with the following:
“The record route function records the path taken by a PDU as it traverses a series of intermediate systems, and
optionally also records timing information. A recorded route consists of a list of entries held in a parameter within the
options part of the PDU header. Each entry consists of either a Network entity title, or a timestamp followed by a
Network entity title: in addition, the first entry in a timestamped list can consist of a timestamp without a Network
entity title, inserted by the originator of the PDU. The length of this parameter is determined by the originating
Network entity, and does not change during the lifetime of the PDU.
The list is constructed as the PDU is forwarded along a path towards its destination. The originator of the PDU shall
either initialize the list as empty, or insert an initial entry containing a timestamp and no Network entity title: the
originator is not required to insert such an initial entry in a timestamped list. All octets in the list, other than an initial
timestamp entry when present, shall be initialized to zero. Subsequently, only entries corresponding to intermediate
system
...