The virtual scene is: a 100-megabit Ethernet with a backbone and 200 data points. Due to work needs, the company plans to use DDN dedicated line to connect to the Internet, and at the same time use ISDN or frame relay as the backup line.
This is a small and medium-sized network with a small number of users. How to meet the needs of users with a suitable product is a problem we need to solve. With the advent of the Internet era, building an internal LAN alone can no longer meet the work needs of many enterprises. More users need to publish information on the Internet or search for information. Connecting the enterprise's internal network to the Internet has become one of the work items that are often encountered in current system integration. This issue is a relatively common environment. The reason why such a typical situation is set in this way is because this is an important growth point in current network construction: the small and medium-sized enterprise network.
We all know that the Internet (Internet) is the largest international computer wide area network in the world today. It contains different LAN types. There are many ways to access the WAN, such as ordinary telephone dialing, satellite lines and digital networks. When the computer LAN and the WAN need to be interconnected through a digital data communication network (such as DDN, X.25, ISDN, frame relay, etc.), a router is usually used to implement it. Routers are one of the most important network interconnection devices. They work at the network layer and are used to interconnect different types of networks. The biggest feature of using router interconnection networks is that each interconnection subnet remains independent, and each subnet can adopt different topology structures, transmission media and network protocols, and the network structure is clearly hierarchical. The function of the router is to select a route for data exchange between the source node and the destination node. It provides various network protocols. The router mainly has the following functions: (1) Network interconnection, the router supports various LANs and wide area network interfaces, mainly used to interconnect LANs and wide area networks; (2) Data processing, providing functions including packet filtering, packet forwarding, priority, multiplexing, encryption, compression and firewall; (3) Network management, the router provides functions including configuration management, performance management, fault-tolerant management and traffic control.
Since most companies used to stay focused on building their own internal computer networks to improve work efficiency and work with various departments, with the rapid development of the Internet, access to the wide area network or the company's own construction of wide area networks has attracted more and more attention. As a result, the frequency of router usage has been rapidly improved.
There are many manufacturers of routers. In the past, foreign brands usually dominated the world, such as Cisco, 3Com, Cabletron, Nortel Networks and other companies. Nowadays, with the advent of the Internet era, many domestic manufacturers have also targeted the computer network market with unlimited potential and have launched their own brand network products. From products with low technical content to products with high technical level, domestic companies have proved their strength with unremitting efforts. We are delighted to see router products from brands such as Huawei, Lenovo, and Shida appear on the market.
Cisco Systems is a leader in router technology. Most of the data flowing on the Internet goes through Cisco's devices, and most of them are Cisco routers. It can be said that the Internet has made Cisco's glory. Cisco routers have multiple series, and for the virtual scenarios in this article, we recommend using the Cisco 1600 series routers. Cisco 1600 series routers are tailor-made for small and medium-sized network access to the Internet and are ideal for small and medium-sized enterprises. This is because in addition to having a fixed WAN port and a fixed Ethernet port, the Cisco 1600 series also supports a WAN interface card, allowing customers to add or change WAN ports as needed, which is very flexible and provides investment protection. The Cisco 1601 R-1604 R router has an Ethernet port, a built-in WAN port, and a slot for optional auxiliary WAN ports. The 1605 R router has 2 Ethernet ports and 1 WAN slot. All models come with an optional Cisco IOS firewall feature set. It is worth mentioning that the 1600 series supports ISDN line DDR on-demand dialing technology, and dialing connections are only performed when data is transferred effectively. When there is no data transmission within a specified time, it will automatically disconnect and reduce line costs. This is fully in line with the needs of this virtual scenario. In addition, 1600 uses NAT technology to allow 200 users of the entire LAN to access the Internet at the same time. The built-in firewall function in IOS can protect the internal network and save users' investment in security.
Features and competitive advantages of adopting the 1600 series solution: supports Cisco IOS software; has flash memory (PC card) and memory update functions, which facilitates software maintenance. In addition, Cisco provides free configuration router networking tools required for installation; it is equipped with Cisco ConfigMaker with a graphical interface, which can simplify device configuration and management; Cisco products use the FastStep configuration utility (based on GUI) to simplify installation and troubleshooting; a modular architecture is convenient for investment protection; full IOS support, Cisco industry-standard networking solutions; industry-standard IOS supports a variety of service quality; interface cards are compatible with the 2600, 3600 series and are convenient and flexible.
Since entering the field of data communication, Huawei has launched a full series of router products. Huawei Technologies Co., Ltd. takes Huawei's independent brand network core technology as the leader, and continues to grow and grow, creating today's outstanding full series of network products. Among them, the Quidway R1602 router meets the needs of this period and is a product for small and medium-sized enterprises. R1602 has rich interfaces and flexible, strong message processing capabilities, and simple configuration and maintenance. The Quidway R1602 router has an RJ-45 Ethernet interface, two homo/asynchronous serial ports, and one backup port. Users can flexibly choose networking solutions in various wide area network technologies such as PSTN/ISDN, Frame Relay, X.25 and DDN, which is suitable for the backup line requirements of this period. In addition, it has strong message processing capabilities. By adopting advanced CPU technology, efficient real-time multi-task operating system and unique software design, the router's message processing capabilities are very powerful; the R1602 router adopts a network management system that complies with international standards: the router's network management system complies with international SNMP standards, complies with a unified network management platform developed by Huawei, and facilitates centralized network management; in addition, it is equipped with a Chinese and English bilingual configuration interface: the command line user interface provided by the router follows the industry's popular router configuration method, and users do not need to do so. This product can be fully configured through training, and Chinese prompts and help information will greatly facilitate domestic users; in addition, R1602 provides rich network security features, such as firewall, packet filtering, address conversion, AAA and Radius, etc., and users can choose different security strategies to form an enterprise network; and R1602 adopts backup center technology, and network reliability is significantly increased: the characteristics of synchronous or asynchronous interfaces can be used to realize the backup of dial-up lines to ensure the demand for high-reliability networks.
According to the requirements of this issue, Lenovo's LR-2501 router can also be selected. The LR-2501 router has 1 10M local area network (LAN) port, 2 wide area network (WAN) ports and 1 console port. Therefore, it meets the characteristics of backup lines required in this scenario. The WAN interface can support Frame Relay, X.25, PPP, HDLC and other WAN protocols, providing transmission rates up to T1/E1, and providing network address translation (NAT) functions. Supports PAD (X.3/X.28/X.29) protocol; provides password protection function.
Based on this network application scenario, you can choose 3Com's OfficeConnect NETBuilder router, which is one of the most widely used models. OfficeConnect NETBuilder has one 10BASE-T LAN port (LAN port) and two WAN ports (WAN port). Each module has a Flex WAN serial port, supporting rates up to 2.048 Mbps (T1/E1 line); there is also a second WAN port of the following types: ISDN S/T, ISDN with NT-1 integrated ISDN, 56/64KCSU/DSU, Ft1/T1 CSU/DSU, or the second port is a Flex WAN port.
3Com OfficeConnect NETBuilder router has many advantages, among which the more prominent ones are: easy to install, 3Com's unique Boundary Routing architecture, Autostartup, Web links, and web-networking configuration and management tools, making plug-and-play installation very simple and easy to use by remote branches; with extensive security, this series of routers is embedded with ICSA certified firewalls, network address translation (NAT) that protects internal addresses security, and supports IPSec and MPPE encryption.
The OfficeConnect NETBuilder series routers can adapt to networks of all sizes and diverse networking needs through support of all major WAN (Wide Area Network) protocols, including Frame Relay, X.25, PPP, ISDN, Async and SMDS. This series of routers has flexible migration options to suit network changes. For example, when a small branch with a boundary router develops to require IP/IPX support, the router can be easily upgraded to an IP/IPX/AppleTalk router with door-to-door software upgrade service without changing existing hardware devices. If you request additional bandwidth, you can simply upgrade the 56/64KCSU/DSUWAN specification (12x K) to the FT1/T1 WAN model (12x T) by replacing the CSU/DSU module.
Since the virtual scene in this issue is a typical network, through product selection, we can see that the products used in this issue are products that have been formed by various manufacturers. At the same time, we can see that the construction of the network of small and medium-sized enterprises is one of the key points of many manufacturers' work, and almost every manufacturer has its own related products. It is worth noting that most manufacturers have also considered the issue of future user network upgrades and have launched modular products. This undoubtedly brings more choices to users and also fully protects users' investment. Due to the layout issue, this issue is only a part of many products, I hope it can help you.
Article entry: csh Editor in charge: csh