Introduction to the broadband Backbone Network Mode in vro Technology

China's vro technology has developed rapidly and has a high market demand. So I have studied several broadband Backbone Network modes in vro technology. I will share them with you here, I hope it will be useful to you. The development of broadband integrated business digital networks is inseparable from the development of intelligent network technology, optical fiber transmission technology and exchange technology, especially the grouping forwarding and exchange technology represented by IP and ATM, which is a hot spot in current network construction.

The flexibility of IP addresses and the fast exchange capability of ATM will surely play a key role in future network technologies. More people in the selection of backbone network switching technology believe that IP addresses and ATMs will be mutually dependent for a long time, and they will not be replaced by others. The construction of the backbone network affects the technical methods and equipment selection of the access network. In this sense, the construction scheme of the communication core network deserves full attention and research.

Vro-based broadband Backbone Network

Currently, most of the IP networks in operation are built using the router technology. The backbone networks are connected using a full mesh. The router technology is used as the network equipment of backbone nodes to form the backbone channel of the multimedia communication network. Backbone Network Nodes constitute an autonomous region, and OSPF routing protocol is used in the autonomous region.

Generally, the technical exchange capability of the node router must be at least 1 Gbps, and the speed of a single port must be above Mbps. It is unrealistic to use the traditional router technology for networking. The new generation of ultra-high-speed router technology has changed the traditional bus mode, and adopts the hardware exchange of vertical and horizontal intersections in the routing switch, the core of the switch is an exchange matrix, which enables the next-generation router technology to directly access the SDH network, with a speed of over 60 Gbps, while greatly simplifying the network structure. The new-generation router technology uses a fixed-length internal IP packet, which is suitable for hardware processing and still adopts the traditional forwarding method on the edge of the network; the CPU Structure dispersed in each channel greatly exceeds the throughput of the bus. It supports all current routing protocols. Therefore, it is feasible and competitive to use the new-generation router technology to establish a multimedia communication backbone network. Because backbone networks support multimedia services, the system must have certain QoS guarantees. Because the IP network uses a Bandwidth Reservation Mechanism, network nodes should support the RSVP protocol. multicast services require nodes to support the multicast function; dial-up virtual private network (VPDN) the backbone network must support tunneling technology and have certain security protection measures.

Of course, there are still some disadvantages of using vro technology to build an IP network backbone network: first, its addressing is still in the HopbyHop mode, and its end-to-end latency is relatively large; second, A network composed of vro technology is the most suitable for IP service. It may be difficult to carry out some real-time multimedia services with strict latency requirements. Third, IP Address Allocation is another difficulty. Because IPv4 addresses are currently scarce resources, the IP address allocation principle of the national backbone network should be: the backbone network occupies the first two class B Capacity addresses, and the IP addresses allocated in the same region should be as continuous as possible, the network addresses of each province use the frontend IP addresses of this province.

ATM-based broadband Backbone Network

As the communication rate increases and the network scale expands, the faster the switching rate of the backbone network, the better. In addition to the high-speed router technology, ATM switches can also be used to build an IP network. In this mode, address ing between ATM and IP addresses must be solved first. Because ATM is a connection-oriented technology and IP is not connection-oriented, it carries non-connection-oriented services on a connection-oriented ATM network, its integration solution has two types: overlay mode and integration mode. The largest feature of the stack mode is that the original signaling and addressing modes in ATM do not need to be changed. IP addresses are only one of the services they carry. Typical models include LNAE, IPOA, and MPOA. The integration mode means that the IP device has been integrated into the ATM device. At this time, the ATM addressing is no longer independent, and the functional module is called the IP control module. It has the functions of traditional router technology and the ability to control the creation of ATM virtual channels.

With the development of the optical fiber technology, the construction of the broadband backbone network was initially centered on the ATM integrated broadband technology. With the application of IP technology, IP has entered the scope of the core network, and the integration of ATM and IP has become the mainstream of technology development. With the emergence of fiber-optic broadband transmission systems, there will also be exchange systems with higher transmission rates, such as IPoverWDM and IPoverSONET. As the backbone network technology with higher speed, all-optical networks are also under research, some devices of the optical switch have also been tested.