khuyến nghị của ITU về mạng viễn thông

[7] ITU-T Recommendation X.233 1997 | ISO/IEC 8473-1:1998, Information technology – Protocol for providing the connectionless-mode network service: Protocol specification.. [9] ITU-T Re

Trang 1

INTERNATIONAL TELECOMMUNICATION UNION

TELECOMMUNICATION STANDARDIZATION SECTOR

Trang 2

ITU-T Q-SERIES RECOMMENDATIONS

SWITCHING AND SIGNALLING

SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1–Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4–Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60–Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100–Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No 4, 5, 6, R1 AND R2 Q.120–Q.499 DIGITAL EXCHANGES Q.500–Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600–Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No 7 Q.700–Q.799

DIGITAL SUBSCRIBER SIGNALLING SYSTEM No 1 Q.850–Q.999 PUBLIC LAND MOBILE NETWORK Q.1000–Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100–Q.1199 INTELLIGENT NETWORK Q.1200–Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700–Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL

CONTROL (BICC) Q.1900–Q.1999 BROADBAND ISDN Q.2000–Q.2999

For further details, please refer to the list of ITU-T Recommendations

Trang 4

FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations

on them with a view to standardizing telecommunications on a worldwide basis

The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics

The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1

In some areas of information technology which fall within ITU-T's purview, the necessary standards are prepared on a collaborative basis with ISO and IEC

INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process

As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database

Trang 5

CONTENTS

Page

1 Scope 1

2 References 1

3 Abbreviations 6

4 DCN model 8

4.1 CONS1 8

4.2 CONS2, CONS3, CLNS3 8

4.3 CLNS1 8

4.4 CLNS2 8

4.5 CONS6 9

4.6 IP 9

5 Lower layer protocol profiles: Overview 9

6 Requirements for network layer/transport layer interface 9

7 Defined protocol profiles 9

7.1 Connectionless-mode protocol profiles 9

7.2 Connection-mode protocol profiles 10

7.3 CL-LAN profile (CLNS1) 11

7.4 CL-WAN profile (CLNS2) 16

7.5 ISDN protocol profile (CLNS3) 21

7.6 IP protocol profiles 22

7.7 Ethernet profile 23

7.8 X.25/LAPB protocol profile (CONS1) 23

7.9 Packet mode bearer service on the D-channel (CONS2) 26

7.10 Packet mode bearer service on the B-channel (CONS3) 27

7.11 Signalling System No 7 networks (CONS5) 27

7.12 Connection oriented LAN (CONS6) 27

7.13 Conformance requirements 28

8 Network layer service 29

8.1 Network layer profiles 29

8.2 Internetworking 30

Annex A – Protocol stack for information transfer over ISDN transparent B-channel 32

A.1 Introduction 32

A.2 Network profile CONS4 32

Annex B – Examples of NSAP structures for CLNP 35

Appendix I – Changes to ISP conformance requirements 36

Trang 7

X interfaces The Q and X interfaces will support bidirectional data transfer for the management of telecommunications systems

The need for security functionality is recognized, but is not fully addressed in this Recommendation and is for further study Users may need to use mechanisms outside this Recommendation in order

to address their specific security needs Security mechanisms chosen may depend on the network configuration being used

If new operational requirements are developed that imply distinctions to be made here between the

Q and X interfaces, future versions of this Recommendation, or possibly new Recommendations, will reflect these differences

This Recommendation defines:

– the layer service profiles for the defined supported networks;

– the layer protocol profiles for the defined supported networks;

– the requirements at the layer 3/layer 4 service boundary for any network used to support the

Q and X interfaces of the TMN

This Recommendation conforms to the "T" profiles in framework for International Standardized Profiles (ISP) as specified in ISO/IEC TR 10000-1 [63] and ISO/IEC TR 10000-2 [64] Profiles in this Recommendation align with equivalent ISPs (as specified in conformance clause) if available

It is the intention to align those profiles for which there are no equivalent ISPs at present to ISPs as they are standardized by ISO SGFS

2 References

The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation At the time of publication, the editions indicated were valid All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below A list of the currently valid ITU-T Recommendations is regularly published The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation [1] ITU-T Recommendation M.3010 (2000), Principles for a telecommunications management

network

[2] ITU-T Recommendation Q.812 (2004), Upper layer protocol profiles for the Q and

X interfaces

[3] ITU-T Recommendation X.200 (1994) | ISO/IEC 7498-1:1994, Information technology –

Open Systems Interconnection – Basic Reference Model: The basic model

1 This protocol is also applicable to the Qx interface when a full seven layer stack is required

Trang 8

[4] ISO/IEC 8802-3:2000, Information technology – Telecommunications and information

exchange between systems – Local and metropolitan area networks – Specific requirements – Part 3: Carrier sense multiple access with collision detection (CSMA/CD) access method and physical layer specifications

exchange between systems – Local and metropolitan area networks – Specific requirements – Part 2: Logical link control

[6] ITU-T Recommendation X.213 (2001) | ISO/IEC 8348:2002, Information technology –

Open Systems Interconnection – Network service definition

Protocol for providing the connectionless-mode network service: Protocol specification

[8] ISO/IEC 8473-2:1996, Information technology – Protocol for providing the

connectionless-mode network service – Part 2: Provision of the underlying service by an ISO/IEC 8802 subnetwork

Protocol for providing the connectionless-mode Network service: Provision of the

underlying service by an X.25 subnetwork

underlying service by a subnetwork that provides the OSI data link service

underlying service by ISDN circuit-switched B-channels

[12] ITU-T Recommendation X.25 (1996), Interface between Data Terminal Equipment (DTE)

and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit

[13] ISO/IEC 7776:1995, Information technology – Telecommunications and information

exchange between systems – High-level data link control procedures – Description of the X.25 LAPB-compatible DTE data link procedures

exchange between systems – Protocol combinations to provide and support the OSI

Network Service – Part 3: Provision and support of connectionless-mode Network Service

[15] ISO 8648:1988, Information processing systems – Open Systems Interconnection – Internal

organization of the Network Layer

[16] ISO/IEC 8208:2000, Information technology – Data communications – X.25 Packet Layer

Protocol for Data Terminal Equipment

[17] ITU-T Recommendation X.223 (1993) | ISO/IEC 8878:1992, Use of X.25 to provide the

OSI connection-mode Network service for ITU-T applications

[18] ITU-T Recommendation E.164 (1997), The international public telecommunication

numbering plan

[19] ITU-T Recommendation X.121 (2000), International numbering plan for public data

networks

[20] ITU-T Recommendation X.244 (1988), Procedure for the exchange of protocol

identification during virtual call establishment on packet switched public data networks

Trang 9

[21] ISO/IEC TR 9577:1999, Information technology – Protocol identification in the network

exchange between systems – Use of X.25 to provide the OSI Connection-mode Network Service

[27] ITU-T Recommendation Q.702 (1988), Signalling data link

[28] ITU-T Recommendation Q.703 (1996), Signalling link

[29] ITU-T Recommendation Q.704 (1996), Signalling network functions and messages

[30] ITU-T Recommendation Q.711 (2001), Functional description of the signalling connection

control part

[31] ITU-T Recommendation Q.712 (1996), Definition and function of signalling connection

control part messages

[32] ITU-T Recommendation Q.713 (2001), Signalling connection control part formats and

codes

[33] ITU-T Recommendation Q.714 (2001), Signalling connection control part procedures

[34] ITU-T Recommendation Q.716 (1993), Signalling System No 7 – Signalling Connection

Control Part (SCCP) performance

[35] ITU-T Recommendation V.24 (2000), List of definitions for interchange circuits between

Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE)

[36] ITU-T Recommendation V.28 (1993), Electrical characteristics for unbalanced

double-current interchange circuits

[37] ITU-T Recommendation V.36 (1988), Modems for synchronous data transmission using

60-108 kHz group band circuits

[38] ISO 2110:1989, Information technology – Data communication – 25-pole DTE/DCE

interface connector and contact number assignments

exchange between systems – 34-pole DTE/DCE interface connector mateability dimensions and contact number assignments

Provision of the OSI connection-mode network service by packet-mode terminal equipment connected to an Integrated Services Digital Network (ISDN)

Open Systems Interconnection – Transport service definition

Trang 10

Open Systems Interconnection – Protocol for providing the connection-mode transport service

[43] ISO/IEC 8881:1989, Information processing systems – Data communications – Use of the

X.25 packet level protocol in local area networks

[44] ISO/IEC ISP 10608:1992, Information technology – International Standardized Profile

TAnnnn – Connection-mode Transport Service over Connectionless-mode Network Service

Part 1: General overview and subnetwork-independent requirements

Part 2: TA51 profile including subnetwork-dependent requirements for CSMA/CD Local

Area Networks (LANs)

Part 5: TA1111/TA1121 profiles including subnetwork-dependent requirements for X.25

packet-switched data networks using virtual calls

[45] ISO/IEC ISP 10609:1992, Information technology – International Standardized Profiles

TB, TC, TD and TE – Connection-mode Transport Service over connection-mode Network Service

Part 1: Subnetwork-type independent requirements for Group TB

Part 5: Definition of Profiles TB1111/TB1121

Part 9: Subnetwork-type dependent requirements for Network Layer, Data Link Layer and

Physical Layer concerning permanent access to a packet switched data network using virtual calls

[46] ISO 9542:1988, Information processing systems – Telecommunications and information

exchange between systems – End system to Intermediate system routeing exchange protocol for use in conjunction with the Protocol for providing the connectionless-mode network service

exchange between systems – Intermediate system to Intermediate system intra-domain routeing information exchange protocol for use in conjunction with the protocol for

providing the connectionless-mode network service

exchange between systems – Protocol for exchange of inter-domain routeing information among intermediate systems to support forwarding of ISO 8473 PDUs

[49] ITU-T Recommendation X.75 (1996), Packet-switched signalling system between public

networks providing data transmission services

[50] ITU-T Recommendation I.550/X.325 (1996), General arrangements for interworking

between Packet-Switched Public Data Networks (PSPDNs) and Integrated Services Digital Networks (ISDNs) for the provision of data transmission services

[51] ITU-T Recommendation X.326 (1988), General arrangements for interworking between

Packet-Switched Public Data Networks (PSPDNs) and Common Channel Signalling

Network (CCSN)

[52] ITU-T Recommendation X.327 (1993), General arrangements for interworking between

Packet-Switched Public Data Networks (PSPDNs) and private data networks for the

provision of data transmission services

Open Systems Interconnection – Physical service definition

Trang 11

exchange between systems – Open Systems Interconnection – Transport protocol

identification mechanism

exchange between systems – Provision of the connection-mode Network internal layer service by intermediate systems using ISO/IEC 8208, the X.25 Packet Layer Protocol

exchange between systems – Definition of the relaying functions of a Network layer

intermediate system

[57] ITU-T Recommendation Q.708 (1999), Assignment procedures for international signalling

point codes

Open Systems Interconnection – Network layer security protocol

exchange between systems – Protocol mappings for the OSI Data Link service

Open Systems Interconnection – Data link service definition

[61] ITU-T Recommendation Q.931 (1998), ISDN user-network interface layer 3 specification

for basic call control

[62] ITU-T Recommendation I.320 (1993), ISDN protocol reference model

[63] ISO/IEC TR 10000-1:1998, Information technology – Framework and taxonomy of

International Standardized Profiles – Part 1: General principles and documentation

framework

[64] ISO/IEC TR 10000-2:1998, Information technology – Framework and taxonomy of

International Standardized Profiles – Part 2: Principles and Taxonomy for OSI Profiles

[67] ITU-T Recommendation V.10/X.26 (1993), Electrical characteristics for unbalanced

double-current interchange circuits operating at data signalling rates nominally up to

100 kbit/s

[68] ITU-T Recommendation V.11/X.27 (1996), Electrical characteristics for balanced

double-current interchange circuits operating at data signalling rates up to 10 Mbit/s

[69] IETF RFC 2401 (1998), Security Architecture for the Internet Protocol

[70] IETF RFC 2460 (1998), Internet Protocol, Version 6 (IPv6) Specification

[71] IETF RFC 2402 (1998), IP Authentication Header

[72] IETF RFC 2406 (1998), IP Encapsulating Security Payload (ESP)

[73] ITU-T Recommendation G.7712/Y.1703 (2003), Architecture and specification of data

communication network

[74] IETF RFC 1122 (1989), Requirements for Internet Hosts – Communication Layers

[75] ITU-T Recommendation M.3030 (2002), Telecommunications Markup Language (tML)

framework

Trang 12

[76] IETF RFC 894 (1984), A Standard for the Transmission of IP Datagrams over Ethernet

Networks

[77] IETF RFC 826 (1982), An Ethernet Address Resolution Protocol

3 Abbreviations

This Recommendation uses the following abbreviations:

AFI Authority and Format Identifier

BIS Border Intermediate System

CLNP Connectionless-mode Network layer Protocol

CLNS Connectionless-mode Network layer Service

Conf Confirm

CONP Connection-mode Network layer Protocol

CONS Connection-mode Network layer Service

COTS Connection-mode Transport Service

CSMA Carrier Sense Multiple Access

CUG Closed User Group

DCE Data Communication Equipment

DCF Data Communication Function

DCN Data Communication Network

DIS Draft International Standard

DLC Data Link Connection

DLS Data Link Service

DSP Domain Specific Part

DTE Data Terminal Equipment

ESP Encapsulation Security Payload

HDLC High-level Data Link Control

IDI Initial Domain Identifier

IDP Initial Domain Part

IDRP Inter Domain Routing (or Routeing) Protocol

IETF Internet Engineering Task Force

Ind Indication

IPSec Security Infrastructure for Internet Protocol

Trang 13

ISDN Integrated Services Digital Network

ISO International Organization for Standardization

ISP International Standardized Profile

LLC Logical Link Control

LME Layer Management Entity

LSP Link State Protocol Data Unit

MAC Media Access Control

MTP Message Transfer Part

NDM Normal Disconnect Mode

NLR Network Layer Relay

NPDU Network Protocol Data Unit

NSAP Network Service Access Point

OSI Open Systems Interconnection

PDU Protocol Data Unit

Ph Physical

PICS Protocol Implementation Conformance Statement

PVC Permanent Virtual Circuit

QoS Quality of Service

Req Request

Res Result

SAP Service Advertising Protocol

SAPI Security Application Program Interfaces

SCCP Signalling Connection Control Part

SCF Service Control Function

SGFS Special Group on Functional Standards

SLP Service Location Profile

SNDCF Subnetwork Dependent Convergence Function

SNP Sequence Numbers Protocol Data Unit

Trang 14

SNPA Subnetwork Point of Attachment

SVC2 Switched Virtual Circuit

TCP Transmission Control Protocol

TMN Telecommunications Management Network

4 DCN model

Table 20 identifies the lower layer protocols for interfaces requiring interworking as well as the interworking method

The following briefly describes the individual lower layer protocol profiles:

– CONS1: A connection-mode packet interface using ITU-T Rec X.25

– CONS2: A connection-mode packet interface using ITU-T Rec X.31 on an ISDN

D-channel

– CONS3: A connection-mode packet interface using ITU-T Rec X.31 on an ISDN

B-channel

– CONS6: A connection-mode packet interface X.25 over LAN

– CLNS1: A connectionless-mode interface using ISO/IEC 8802-2 type LANs using

– IP: Internet Protocol for use in the TMN (see 7.6)

This clause provides typical examples of the application of these profiles at the Q and X interfaces Other fields of application are not precluded by this Recommendation The differences between the following profiles will be further discussed in ITU-T Rec Q.812

Trang 15

5 Lower layer protocol profiles: Overview

The communication services and protocol referred to in this Recommendation are in accordance with the Open Systems Interconnection (OSI) reference model [3]

The protocols for the different layers are based on ITU-T Recommendations and/or ISO/IEC Standards

The protocol profiles can be applied to DCN, as defined by ITU-T Rec M.3010 [1]

Any Administration may use any existing network that meets the requirements at the layer 3/layer 4 service boundary

For the Protocol Profiles defined in this Recommendation, interoperability mechanisms are to be defined as a part of this Recommendation For networks not using these profiles, it is the responsibility of the individual Administration to solve any interoperability problems that may exist

6 Requirements for network layer/transport layer interface

See clause 8 and its subclauses

7 Defined protocol profiles

7.1 Connectionless-mode protocol profiles

7.1.1 LAN (see Figure 2)

NOTE – Figure 3/Q.811 (1993), Protocol profile for network management, has been deleted

Trang 16

7.1.2 WAN, LAN (see Figure 2)

7.1.3 ISDN (see Figure 2)

7.2 Connection-mode protocol profiles

7.2.1 X.25/LAPB [see Figure 1 (1), (3), (2), (5)]

ITU-T Rec Q.812 upper layers

ITU-T Rec X.612 | ISO/IEC 9574

ISO/IEC 8208 DTE/DCE operations

Q.931 procedures used

as described in Rec X.31

Q.931 procedures used

as described in Rec X.31

ITU-T Rec X.212

ISO/IEC 7776 SLP-DTE/DCE operation

ISO/IEC 8802-2 LLC (Type 2) ISO/IEC 8802-3 MAC CSMA/CD

Q.921 Layer 2 multiplexer D-channel

I.430 (BA) or I.431 (PRA)

NOTE – Further study is needed for the function of SCCP at the boundary of Network layer and Transport Layer.

Figure 1/Q.811 – Connection (CONS) profiles

Trang 17

ITU-T Rec Q.812 upper layers

|

ISO/IEC 8802-2 LLC

ISO/IEC 7776 SLP

Not specified

Recs X.27, X.21 X.21 V.11/X.27/V.36 V.28/V.24

I.430 (BA) or I.431 (PRA)

ITU-T Rec Q.931

ITU-T Rec X.625 | ISO/IEC 8473-5

ISO/IEC 8802-3 MAC

CSMA/CD

ITU-T Rec X.622 | ISO/IEC 8473-3 ISO/IEC 8208

All of the primitives defined and listed in Table 1 are mandatory

Table 1/Q.811 – Primitives of the Physical layer

Primitive

PLS-DATA-request PLS-DATA-indication PLS-CARRIER-indication PLS-SIGNAL-indication

Trang 18

7.3.2 Data link layer profile

The Data Link layer provides the unacknowledged connectionless-mode service The access method employed is Carrier Sense Multiple Access with Collision Detection (CSMA/CD)

7.3.2.1 Media Access Control (MAC) profile

The services and protocol of the CSMA/CD access method shall comply with those specified in ISO/IEC 8802-3 [4]

The address length used at the MAC sub-layer shall be 48 bits

7.3.2.2 Logical Link Control (LLC) profile

The definition of the unacknowledged connectionless-mode LLC service shall comply with that specified in ISO/IEC 8802-2 [5] All of the primitives defined for "Type 1" operation shall be supported

The protocol used to provide the unacknowledged connectionless-mode LLC service shall be as specified in ISO/IEC 8802-2 [5] All of the commands and responses defined for "Type 1" operation shall be supported

7.3.3 Network layer profile

7.3.3.1 Services profile

The definition of the connectionless-mode Network service shall comply with that specified in ITU-T Rec X.213 | ISO/IEC 8348 [6] Address formats supported shall also conform to ITU-T Rec X.213 | ISO/IEC 8348 [6]

The Network layer shall provide the N-UNITDATA service as specified in ITU-T Rec X.213 | ISO/IEC 8348 [6]

7.3.3.2 Protocol profile

The protocol shall be in accordance with the full protocol subset of category "Type 1" functions, as specified in ITU-T Rec X.233 | ISO/IEC 8473-1 [7]

7.3.3.3 Network layer attributes

Characteristics of the connectionless-mode Network layer service and the connectionless-mode Network layer protocol shall be as shown in Table 2

Table 2/Q.811 – Connectionless-mode network layer service/protocol parameters

a Destination and Source Addresses used by this Protocol shall conform to one of the Network Service Access Points (NSAPs) address formats specified in ITU-T Rec X.213 | ISO/IEC 8348 [6]

The Destination and Source Addresses are of variable length The Destination and Source Address fields shall be as Network Protocol Address Information using the preferred Binary Encoding

specified in ITU-T Rec X.213 | ISO/IEC 8348 [6]

b The setting of Error Reporting Flag (E/R) shall be a local matter (Note)

c Partial Source Routing shall NOT be supported A defect exists with this option which can cause PDUs to loop in the network until their lifetime expires

d Inactive Subset – Implementations shall not transmit PDUs encoded using the

ITU-T Rec X.233 | ISO/IEC 8473-1 inactive subset Received PDUs encoded with the inactive

subset shall be discarded

e Segmentation – The non-segmentation subset shall NOT be used However, implementations shall

be capable of receiving and correctly processing PDUs which do not contain the segmentation part

Trang 19

Table 2/Q.811 – Connectionless-mode network layer service/protocol parameters

f Segmentation Permitted Flag – Implementations shall NOT generate data PDUs without a

segmentation part, i.e., the Segmentation Permitted Flag (SP) shall be set to 1 and the segmentation part shall be included

g Lifetime Control – The lifetime parameter shall be used as specified in 6.4 of

ITU-T Rec X.233 | ISO/IEC 8473-1 This parameter shall have an initial value of at least three times the network span (number of network entities) or three times the maximum transmission delay (in units of 500 milliseconds), whichever is greater The default initial PDU lifetime control shall be

10 seconds

h Quality of Service (QoS) – The use of the QoS Maintenance Parameter shall be dependent upon the QoS requirements of the subnetworks supporting an instance of OS-NE communications When QoS

is used, it shall comply with the specifications in 6.16, 6.19, and 7.5.6 of

ITU-T Rec X.233 | ISO/IEC 8473-1 It is recommended that Quality of Service Maintenance be supported and that the globally unique QoS format be used which includes the Congestion

Experienced (CE) bit used by the Congestion Notification option

i Reassembly timer – The reassembly timer must be less than the largest value of all the lifetime

parameters contained in all derived PDUs The default Reassembly timer shall be 12 seconds

j Congestion Notification – The use of Congestion Notification option is recommended The default value should be 0 when originating PDUs For NEs and MDs that act as ISs, it is recommended that Congestion Notification be supported so that end systems can take appropriate action to avoid and recover from network congestion

NOTE – The use of error Reporting and setting the E/R flag to 1 may lead to excessive network traffic

7.3.3.4 ES-IS routing

TMN entities that use the CLNP shall support the ISO 9542 [46] for ES-IS routing exchange The ES-IS protocol is provisioned as either an End System (ES) role, or an Intermediate System (IS) role The Data Communication Function (DCF) within the TMN entities must therefore be provisioned in accordance with their role(s)

The ES-IS protocol subsets: Configuration Information (CI) and Redirection Information (RI) shall

be supported in accordance with the type of subnetwork, as shown in Table 3 Tables 4 and 5 give the timer values and options for the ES and IS roles, respectively

Table 3/Q.811 – ES-IS subsets

Type of subnetwork Protocol subset Point-to-point (Note 1) Broadcast (Note 2) General topology (Note 3)

NOTE 1 – An example of a point-to-point subnetwork is the SDH DCC

NOTE 2 – An example of a broadcast subnetwork is a CSMA/CD LAN

NOTE 3 – An example of a general topology subnetwork is an X.25 packet network

Trang 20

Table 4/Q.811 – ES-IS protocol timers and options for the end system role

(50 s) (105 s)

Functions:

PDU Header Checksum Generation

Configuration Notification (Notes 1, 3)

Refresh Redirect (Note 2)

Address and SNPA Mask Processing (Note 2)

Optional, use, non-use Optional, use, non-use Use, non-use

Optional, use, non-use

(Non-use) (Use) (Use) (Use) Supplemental Functions per Annex B of ISO/IEC 9542:

NOTE 2 – Applies to the Redirection Information (RI) subset

NOTE 3 – See recommendation in 6.7 of ISO/IEC 9542

NOTE 4 – See B.4 of ISO/IEC 9542

Table 5/Q.811 – ES-IS protocol timers and options for the intermediate system role

(10 s) (25 s)

Functions:

PDU Header Checksum Generation

Configuration Notification (Notes 1, 3)

Address and SNPA Mask Processing (Note 2)

Optional, use, non-use Optional, use, non-use Optional, use, non-use

(Non-use) (Use) (Use) Supplemental Functions per Annex B of ISO/IEC 9542:

NOTE 1 – Applies to Configuration Information (CI) subset

NOTE 2 – Applies to the Redirection Information (RI) subset

NOTE 3 – See recommendation in 6.7 of ISO/IEC 9542

7.3.3.5 IS-IS intra-domain routing

ISO/IEC 10589 [47], the IS-IS intra-domain protocol for use with the CLNP, shall be used by TMN

entities that operate as Intermediate Systems for the purpose of routing connectionless NPDUs

Each IS within the TMN must be capable of routing within their area and therefore must provide the

functionality of a Level 1 IS Additionally, an IS may be provisioned as a Level 2 IS, which

provides the capability of routing from one area to another and therefore contains routing

information about ISs outside a specific area The functionality of a Level 2 IS is not needed in each

IS within the TMN An example of a Level 2 IS might be a gateway NE Details for use of

ISO/IEC 10589 for TMN applications are found in Tables 6 through 11

Trang 21

Table 6/Q.811 – IS-IS general protocol functions

(Non-use) (Non-use) (Non-use) (Non-use)

Table 7/Q.811 – IS-IS general processes

Decision Process:

Equal Cost Paths

Down Stream Paths

Optional, use, non-use Optional, use, non-use

(Non-use) (Non-use)

Table 8/Q.811 – IS-IS Level 1 specific functions

Protocol Summary:

Maximum Area Addresses (Note)

Area IS Count (Note)

0-12 1-512

(3) (512) NOTE – These numbers are preliminary and are subject for study and possible change

Table 9/Q.811 – IS-IS Level 2 specific functions

Protocol Summary:

L2 IS (Note 2)

L2 IS Count (Note 1)

IS Count (Note 3)

Reachable Address Prefix

External Metrics (Note 4)

Partition Repair

Optional, use, non-use 1-512

1-512 Optional, use, non-use Use, non-use

Optional, use, non-use

(Non-use) (256) (512) (Non-use) (Non-use) (Non-use) Decision Process:

L2 Attached Flag (Note 3)

L2 Partition DIS Election (Note 5)

L2 Partition Area Addresses

Computation (Note 5)

L2 DIS Partition Repair (Note 5)

Optional, use, non-use Use, non-use

Use, non-use Use, non-use

(Non-use) (Non-use) (Non-use) (Non-use) Forward/Receive Process

L2 NPDU Encapsulation (Note 5)

L2 NPDU Decapsulation (Note 5)

Use, non-use Use, non-use

(Non-use) (Non-use) NOTE 1 – These numbers are preliminary and are subject for study and possible change

NOTE 2 – These functions only apply when the IS is a level 2 IS

NOTE 3 – This function is mandatory when the Level 2 functions are supported

NOTE 4 – This function is mandatory when Reachable Address Prefixes are supported

NOTE 5 – This function is mandatory when the Partition repair function is supported

Trang 22

Table 10/Q.811 – Level 2 subnetwork dependent functions

ISO/IEC 8208 Dynamic Assignment:

Call Establishment Metric Increment

Reverse Path Cache

Optional, use, non-use Optional, use, non-use

(Non-use) (Non-use)

Table 11/Q.811 – IS-IS parameter values and timers

Parameter Values:

Default Metric

Max Path Metric

Minimum LSP Receive Buffer Size

IS-IS Holding Multiplier

Max Path Splits

Max Virtual Adjacencies

1-63

1023

1492 octets

10 1-32 0-32

(20) – – – (2) (2) Timers:

Zero Age Lifetime

IS-IS Hello Timer

Complete SNP Interval Timer

Max LSP Generation Interval Timer

Min LSP Generation Interval Timer

Min LSP Transmission Interval Timer

Partial SNP Interval Timer

Poll ES Hello Rate Timer

Waiting Timer

Reserve Timer

1200 s

60 s 0-3 s 0-10 s 0-15 min 0-30 s 0-5 s 0-2 s 0-50 s 0-60 s 2-6 s

– – (3 s) (10 s) (15 min) (30 s) (5 s) (2 s) (50 s) (60 s) (6 s)

7.3.3.6 IS-IS inter domain routing

Border Intermediate Systems (BISs), using the ISO/IEC 10747 Inter Domain Routing Protocol

(IDRP) [48], may be employed for routing ITU-T Rec X.233 | ISO/IEC 8473-1 CLNP PDUs

between Administrative Domains as defined in ITU-T Rec X.213 | ISO/IEC 8348

– X.21 interface in accordance with 1.1/X.25 [12];

– X.21 bis interface in accordance with 1.2/X.25;

– V-series interface in accordance with 1.3/X.25

Trang 23

7.4.1.2.1 Bit rate

The supported bit rates are: 1200, 2400, 4800, 9600, 19 200, and 64 000 bit/s The bit rates

48 000 bit/s and 56 000 bit/s may be used for an interim period (see Note 1 to Table 18)

7.4.1.3 Connector

Table 12 lists the connectors to be used in accessing the X.21 and X.21 bis interfaces Tables 13,

14, and 15 list respectively the pin descriptions of ISO 2110 [38], ISO/IEC 2593 [39],

ISO 4902 [65] and ISO 4903 [66]

Table 12/Q.811 – X.21/X.21 bis connectors

ISO/IEC 4902

ISO 4903

Table 13/Q.811 – ISO 2110 [38] pin description (see Note 6)

125

109

Request to Send Clear to Send Data Set Ready (DCE Ready) Data terminal Ready (DTE Ready) Ring Indicator

Received Line Signal Detector

Cable: connected to shield

NOTE 2 – Basic interchange circuits, all systems

NOTE 3 – Additional interchange circuits required for switched service

NOTE 4 – Circuit 113 is not used in OS-MD/NE interfaces

NOTE 5 – Additional interchange circuits required for synchronous channel

NOTE 6 – Duplex, interface type D

NOTE 7 – Circuits are grouped by function: ground, data, control, and timing

NOTE 8 – For further information see ITU-T Recs V.24 [35], V.28 [36] and ISO 2110 [38]

Định dạng
Số trang	46
Dung lượng	467,18 KB