Page 115 - 5G Basics - Core Network Aspects

Core network aspects 1

VLAN Virtual Local Area Network

5 Conventions

The keywords "is required to" indicate a requirement which must be strictly followed and from which no
deviation is permitted, if conformance to this Recommendation is to be claimed.

The keywords "is recommended to" indicate a requirement which is recommended but which is not
absolutely required. Thus, this requirement need not be present to claim conformance.

6 Overview of network virtualization

Network virtualization is a method that allows multiple virtual networks, called logically isolated network
partitions (LINPs), to coexist in a single physical network [ITU-T Y.3011]. In order to provide LINPs, physical
resources are partitioned and abstracted as virtual resources and the virtual resources are interconnected to
create an LINP. These virtual resources can be created on physical resources such as routers, switches and
hosts. As such, virtual resources are either allocated to each LINP or multiple virtual resources are aggregated
into a single virtual resource.

Physical resources are composed of transport resources, computing resources and storage resources. A
transport resource includes a physical node, link, router and switch, all of which are components of a
transport network. A computing resource includes a central processing unit (CPU) and memory, which are
components of a computing system. A storage resource includes a device holding a high volume of data.

7 Requirements
To operate LINPs and provide network services, both physical and virtual resources need to be controlled
and managed effectively and efficiently. Since resources are managed by using different management
functions in the entire cycle of service deployment, requirements for these functions are given in this clause.
Realizing authentication, authorization, and accounting (AAA) of LINP, LINP federation and service mobility
are also important issues from the viewpoint of flexible service deployment [b-Nakao].The requirements for
these issues are also provided.

7.1 Physical resource management
Physical resource management enables effective and consistent use of physical resources which may include
heterogeneous types of equipment such as routers and servers developed by different vendors.
The requirements for the physical resource management are as follows:
– The physical resource management is required to provide capabilities for managing, controlling, and
monitoring heterogeneous types of physical resources for virtual resource management.
– The physical resource management is required to provide diagnosis mechanisms for
troubleshooting to help identify the causes of physical resources failures.
– The physical resource management is recommended to provide information obtained through the
diagnosis mechanisms (e.g., expected recovery time) to virtual resource management.
– The physical resource management is recommended to provide recovery mechanisms from physical
network failures to improve reliability.
– The physical resource management is recommended to detect new physical resources automatically
as they are added to the network.

7.2 Virtual resource management
Virtual resource management enables LINPs to bind physical resources and virtual resources.

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