ITU-T G 852 2-1999 Enterprise Viewpoint Description of Transport Network Resource Model - Series G Transmission Systems and Media Digital Systems and Networks Digital Transmission an.pdf

1、STDmITU-T RECMN G* all 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. i ITU-T Recommendation

2、 G.85 1.1 (1 996), Management of the transport network - Application of the RM-ODP pamework. 2 ITU-T Recommendation G.852.1 (1996), Enterprise viewpoint for simple subnetwork connection management. 3 ITU-T Recommendation G.852.3 (1 999), Enterprise viewpoint for topology management. 4 ITU-T Recommen

3、dation G.852.6 (1999), Enterprise viewpoint for trail management. 5 ITU-T Recommendation G.852.8 (1 999), Enterprise viewpoint for pre-provisioned adaptation management. 6 ITU-T Recommendation G.852.1 O (1 999), Enterprise viewpoint for pre-provisioned link connection management. 7 ITU-T Recommendat

4、ion G.852.12 (1 999), Enterprise viewpoint for pre-provisioned link management. 8 ITU-T Recommendation G.853.1 (1 999), Common information elements of the information viewpoint for the management of a transport network. 9 ITU-T Recommendation G.853.2 (1 996), Subnetwork connection management informa

5、tion viewpoint, 1 O ITU-T Recommendation G.853.3 (1999), Information viewpoint for topology management. li ITU-T Recommendation G.853.6 (1999), Information viewpoint for trail management. 123 ITU-T Recommendation G.853.8 (1 999), Information viewpoint for pre-provisioned adaptation management. I l R

6、ecommendation 6.852.2 (03199) 1 STD-ITU-T RECMN G.852-2-ENGL 1999 4b259J Ob62405 83b m 131 ITU-T Recommendation G.853.1 O (1999), Information viewpoint for pre-provisioned link connection management. 141 ITU-T Recommendation G.853.12 (1 999), Information viewpoint for pre-provisioned link management

7、. 151 ITU-T Recommendation G.854.1 (1 996), Computational interfaces for basic transport network model. 161 ITU-T Recommendation G.854.3 (1 999), ComputationaE viewpoint for topology 171 181 191 20 2 i 22 management. ITU-T Recommendation G.854.6 (1 999), Computational viewpoint for trail management.

8、 ITU-T Recommendation G.854.8 (1999), Computational viewpoint for pre-provisioned adaptation management. ITU-T Recommendation G.854.1 O (1 999), Computational viewpoint for pre-provisioned link connection management. ITU-T Recommendation G.854.12 (1 999), Computational viewpoint for pre-provisioned

9、link management. ITU-T Recommendation G.855.1 (1999), Management information generic network level model. ITU-T Recommendation M.3 1 OO/Amd. 1 (1 999), Generic Network Information Model - Amendment I. 3 Definitions None. 4 Abbreviations This Recommendation uses the following abbreviations: AP Access

10、 Point CP Connection point CTP Connection Termination Point LC Link Connection SNC Subnetwork Connection TCP Trail Connection point TTP Trail Termination Point 5 Conventions None. 2 Recommendation G.852.2 (03/99) STD-ITU-T RECMN G-852*2-ENGL 1997 48b2591 Obb240b 772 6 Transport network resource mode

11、l 6.1 Community TEM “transport network enterprise model“ 6.1.1 Purpose The objective of this community is to provide a set of definitions of management abstractions of G.805 transport networks architectural components. The resources defined in this community provide a basis for the description of en

12、terprise specifications of transport network-level management services. A resource can be defined as what is to be managed at the network level, something which is used by a transport network-level management service. 6.1.1.1 General policy Resource Identifier general permission: Each TEM resource h

13、as a Resource IdentiJier that needs to be unique, in the domain in which it is used. A user responsible to create a resource, may use a User IdentiJier that may be attached to the resource at creation time and gives the value for the Resource Identifier. This user identifier (if it is defined) has t

14、hen to be used by the user in all operations attached to the resource as the resource identifier. The User Identifier may change during the life of the resource and all change shall be reported. User label general permission: As a general policy, user labels may be associated with TEM entities. For

15、a given community, these names are assigned by the caller and may be changed. They are not guaranteed to be unique. They carry no semantic information, but are used to “label“ the physical or logic resource for purposes understood by the caller and perhaps by other potential callers who have a commo

16、n understanding of the semantics carried by the user label. The User Label is an optional string attached to a resource which may be defined at creation time or later. This string (if it is defined) must - not be used by the caller to identify the resource in an operation. 6.1.1.2 Relationships betw

17、een specifications All resources defined in this Recommendation will be used by the management components described in other specifications (as in Recommendations G.852.3, G.852.4, G.852.5, .). These resources will be used as roles in each community. That can be explained by the fact that the TEM co

18、ncept represents the actual resource, independently of all management action. Each resource may play a role in the description of a management component. For example, looking at Figure 1, it can be seen that a TEM connection termination point that represents the managed view of G.805 functions (adap

19、tation and trail termination) will play the role of port in the simple subnetwork connection configuration service (G.852.1) and the role of connection termination point in the adaptation management service. A set of management components will be defined in Recommendations to allow the management of

20、 a transport network. Each organization will be able to use the components it wishes, independently from the others. An activity may be defined that relates all these management components in order to construct a management application, but it is not a standardization process to describe this overal

21、l activity. The components studied so far are: e simple subnetwork connection configuration (G.852.1): allows to connect or release a trail management: allows to connect or release a trail across a layer network domain; topology management: allows to create, delete and modify the topology resources

22、pre-provisioned link management: allows to manage the capacity of a link by adding or subnetwork connection across a subnetwork; e (subnetworks, links, link ends, access groups); removing link connections; Recommendation G.852.2 (03/99) 3 STD-ITU-T RECMN G-852.2-ENGL 1999 4862593 0662407 609 D O pre

23、-provisioned link connection management: allows to assign the link connections inside a pre-provisioned adaptation management: allows to manage the adaptation between a client link to several users; layer network and a server layer network by creating the link connections served by a trail. O Manage

24、ment services enterprise Communities Use of resources subnetwork connection configuration“ Trail termination / Community “adaptation management“ t Connection termination point Trail termination point Management abstraction t (3.805 resources D trail termination function The resources are: - access g

25、roup; - administrative domain; - connection termination point; - equipment; - layer network domain; - link; - link connection; I - link end; - node; - physical port; - subnetwork; - subnetwork connection; I TO41023088 connection point adaptation function Figure UG.852.2 4 Recommendation G.852.2 (03/

26、99) STD=ITU-T RECMN G-852.2-ENGL 1997 m 48b2591 Obb2408 545 m - tandem connection; - topological link; - topological link end; - trail; - trail termination point. They appear in Figure 2: I I I I I I I I Server I layer i I I I I I I I I I I I I / termination termination point TO41 M5O-98 point 0 Por

27、t defined in Recommendation G.805 Figure 2/G.852.2 6.2 Resources 6.2.1 Access group An access group represents a group of Co-located trail termination points that are bound to one subnetwork or link. i Properties SIGNAL - IDENTIFICATION: An access group has a signal identification which represents t

28、he specific signal format that the resource carries. The specific format values will be defined in the technology specific extensions. GROUPING: An access group is a set (possibly empty) of trail termination points. GROUPING-CONSTRAINT: The trail termination points of a given access group have all t

29、he same signal identification as the access group. Recommendation G.852.2 (03/99) 5 STD-ITU-T RECMN G*852=2-ENGL 1999 m 4862591 0bb2409 481 m GROUPING - CRITERIA: Criterion to group trail termination points in an access group may be multiple, including: same client subnetwork or link, same routing,

30、etc. As a consequence, a given trail termination point may be part of zero, one or more access groups. For example, an access group may contain a number of trail termination points that are equivalent for routing purposes, i.e. from this access group originates a unique link towards a unique subnetw

31、ork in the same layer network. Or the group may be made according to the client layer network: all trail termination points of this access group serve connection termination points at the boundary of an unique subnetwork in the client layer. TOPOLOGICAL-END-DIRECTION: An access group has a direction

32、ality that characterizes its ability to originate or/and terminate the traffic to be carried. It may be source, sink, bidirectional or undefined. An access group sink shall contain trail termination points sink. An access group source shall contain trail termination points source. An access group bi

33、directional shall contain trail termination points bidirectional. An access group undefined shall contain trail termination points sink, source or/and bidirectional. 6.2.2 Administrative domain An administrative domain is a domain in which the resources are grouped for a management purpose by an adm

34、inistrator. A transport administrative domain contains only transport network resources, excluding service-level resources. The administrative domain defines the allocation of responsibility for managing a collection of resources between operators, or between different parts of an operators organiza

35、tion. A transport network resource may pertain to several transport administrative domains, according to the management function considered. An administrative domain may contain resources belonging to several layer network domains. Typical applications are the allocation of individual operators resp

36、onsibilities in a multi-operator (e.g. international) network context, or regional responsibilities within one operators organization, or the allocation of access rights (responsibilities) to customers for managing the resources available within e.g. a Virtual Private Network. 6.2.3 Connection termi

37、nation point A connection termination point represents the potential extremity of a link connection. It relates to the G.805 port and its associated part of the adaptation function that is in the server layer (Figure 3). 6 Recommendation G.852.2 (03/99) STDsITU-T RECMN G-852.2-ENGL 1999 m 4862591 Ob

38、b2410 LT3 m G.805 port connection termination poinf G.805 adaptation function G.805 - G.805 trail termination function c- trail termination point 04160-9a Figure 3lG.852.2 Properties POINT DIRECTIONALITY: A connection termination point has a directionality that characterizes the abil Connection term

39、ination point A-end Link connection Subnetwork connection T41M70-98 Figure 4lG.852.2 Recommendation G.852.2 (03199) 7 a link connection (it is the arc view and it means that the subnetwork connection that should be there is not manageable) (Figure 5); Connection termination point A-end Link connecti

40、on 1 d _r-_ A- .-i 1 I T04102Bo-98 Link connection Degenerated subnetwork connection Figure 5G.852.2 a connection termination point (it is the point view and it means that the subnetwork connection that should be there is not manageable) (Figure 6); Connection termination point A-end Link connection

41、 / c I w -_-_-_- R? LA T0410290-98 Connection Degenerated subnetwork termination point connection Figure 6/G.852.2 or a trail termination point (if at the border of the layer network) (Figure 7); Connection termination point A-end link connection I TO41COO-98 trail termination point (at the border o

42、f a network layer) connection Degenerated subnetwork Figure 7/G.852.2 8 Recommendation G.852.2 (03/99) or nothing (nothing has been provisioned yet). TOPOLOGICALCONSTRAINTS: A connection termination point may be bound to one subnetwork, (or a set of subnetworks related by partitioning), or one acces

43、s group (Figure 8). Connection termination point A-end link connection 02 1 I Access group Connection termination point Z-end To41031 0-98 Figure 816.852.2 ADAPTATION-RELATION: Connection termination points may be supported by a trail termination point. In such a case, the connection termination poi

44、nts pertain to a given layer network (known as the client layer network) and the trail termination point that supports them pertain to a server layer network, as shown in Figure 9. _Connection - termination point client layer server layer TC410320-98 trail termination point Figure 9/G.852.2 B NDLING

45、: A connection termination point may bundle otler connection termination points. In the context of SDH, bundling of connection termination points may be used for contiguous or virtual concatenation, but is not restricted to these. In the context of ATM, it may be used to group a connection terminati

46、on point carrying end-user information and a connection termination point carrying OAM cells. 6.2.4 Equipment An equipment represents physical components of a managed element, including replaceable components. It may be nested within another equipment. (see M.3100 definition). Examples of equipment

47、are multiplexers, cards, fibres, switches, etc. Properties LOCATION: An equipment has a location that permits to locate where transport functions are. Recommendation 6.852.2 (03199) 9 STD-ITU-T RECMN G.852.2-ENGL 1999 - 48b2591 Obb2413 902 b 6.2.5 Layer network domain A layer network domain is a tra

48、nsport administrative domain in which all resources pertain to the same G.805 layer. It represents the network entities which together provide communication services with one signal identification. Properties RELATIONS: A layer network domain may be related to other layer network domains as server o

49、r client. The corresponding signal identifications shall have an adaptation relationship. For example, an SDH VC4 layer network domain may serve SDH VC11 , VC12, VC3 or ATM VP layer network domains or an ATM VP layer network domain may serve an ATM VC layer network domain. 6.2.6 Link A link represents capacity between two subnetworks, two access groups or one subnetwork and one access group (Figure 1 O). This capacity will be defined in accordance with the technology. acce