Hello, everyone!
Today, I want to explain the VAN. VAN is an abbreviation from Virtual Access Network. It is part of a physical access network. A physical access network can be divided into multiple logical virtual access networks (VANs). The VAN allocates special resources and configurations and O&M is done independently for each VAN.
One OLT can have multiple virtual systems (VSs). Each of these virtual systems behaves like a separate OLT. Service deployment and management work independently on Vss. One OLT can have multiple virtual systems (VSs). Each of these virtual systems behaves like a separate OLT. Service deployment and management work independently on VSs. The physical network is divided into several logical or virtual access networks.
By increasing the various services in the access network, the following problems occur:
large investments in equipment and low utilization,
simple O&M of isolation, and
insufficient isolation security.
Figure 1. Traditional access service bearing and VAN service bearing
(SmartAX MA5800 Multi-service Access Module, V100R018C00, Feature Guide)
Traditional OLTs, in VAN, are transformed into distributed OLTs. These distributed OLTs use logical and physical resources independently and manage services independently. In this way, greater service reliability, isolated and independent service management are enabled. This situation can see in figure 1.
As I said before, one physical OLT can have multiple virtual systems (VSs), a maximum of 4 VSs (it includes the managing VS and service VSs). Each Virtual System behaves as a separate OLT - vOLT. It has an independent deployment of services and management.
The characteristics of management VS are as follows:
managing physical resources such as control boards, power supply boards and subracks.
management and maintenance of services and devices, and
account and configuration management.
The characteristics of service VS are as follows:
management of resources such as ports on OLT (physical resources) and management of VLANs and MAC addresses (logical resources).
based on the scenario services can be independently developed on each VSs, and
it is possible to log in only to this VS.
Working mode management VS does not need to be set, it is in the system by default.
In the next figure, we can see the relationship between management VS and service VSs.
Figure 2. Relationship between management VS and service VSs
(SmartAX MA5800 Multi-service Access Module, V100R018C00, Feature Guide)
Service VSs are created using VS management. There are two working modes of service VSs: board mode and port mode. VANs support different levels of management: board level, port level and ONT level. Table 1. shows the service VS working mode, resource allocation mode and VAN management granularity.
Tabel 1. Service VS working mode, resource allocation mode and VAN management granularity
(SmartAX MA5800 Multi-service Access Module, V100R018C00, Feature Guide)
This is the end of this article. I will continue to write about this topic in the next article >> VAN (2): VAN principle.
Thank you!
Reference:
SmartAX MA5800 Multi-service Access Module, V100R018C00, Feature Guide
